{"id":9112,"date":"2026-09-30T17:47:54","date_gmt":"2026-09-30T16:47:54","guid":{"rendered":"https:\/\/wheat-quail-856400.hostingersite.com\/?p=9112"},"modified":"2026-10-23T21:33:39","modified_gmt":"2026-10-23T20:33:39","slug":"what-is-human-serum","status":"publish","type":"post","link":"https:\/\/seamlessbio.de\/de\/what-is-human-serum\/","title":{"rendered":"Was ist Humanserum?"},"content":{"rendered":"<!-- ============================================================\n   SeamlessBio Blog Post \u2014 sb-bp Format\n   Slug:        what-is-human-serum\n   SEO Title:   What Is Human Serum? Definition, Types & Applications  (54 chars \u2713)\n   Meta Desc:   Human serum definition, types (AB, pooled, heat-inactivated) and applications in cell culture, immunology and ATMP manufacturing. (133 chars \u2713)\n   Keyphrase:   what is human serum\n   Secondary:   human serum cell culture \u00b7 human serum types \u00b7 human AB serum\n   Int. links:  \/human-sera-plasma-and-more\/ \u00b7 \/human-plasma-apheresis-plasma\/ \u00b7 \/resources\/\n                \/human-serum-off-the-clot-vs-plasma-derived\/ \u00b7 \/contact\/\n   AEO target:  Featured snippet on \"what is human serum\" + PAA boxes\n   ============================================================ -->\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BreadcrumbList\",\n  \"@id\": \"https:\/\/seamlessbio.de\/what-is-human-serum\/#breadcrumb\",\n  \"itemListElement\": [\n    {\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/seamlessbio.de\/\"},\n    {\"@type\":\"ListItem\",\"position\":2,\"name\":\"Blog\",\"item\":\"https:\/\/seamlessbio.de\/blog\/\"},\n    {\"@type\":\"ListItem\",\"position\":3,\"name\":\"What Is Human Serum? 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.sb-bpwhs-cta{padding:28px 20px}\n  .sb-bpwhs-answer{padding:22px 20px}\n  .sb-bpwhs-types{grid-template-columns:1fr}\n}\n<\/style>\n\n<!-- HERO -->\n<div class=\"sb-bpwhs-hero\">\n  <p class=\"meta\">Guide \u00b7 Human Serum \u00b7 Cell Culture \u00b7 October 2026 \u00b7 12 min read<\/p>\n  <h1>What Is Human Serum? Definition, Types and Cell Culture Applications<\/h1>\n  <p>The complete reference guide to human serum \u2014 what it is, how it is made, which type to choose for your application, and how to qualify a lot. Written by a specialist supplier with direct access to EU and US donor networks.<\/p><p class=\"sb-hs-buy\" style=\"background:#f1faf9;border-left:4px solid #18b7b2;border-radius:8px;padding:12px 16px;margin:16px 0\">Looking to buy? See our <a href=\"https:\/\/seamlessbio.de\/human-serum\/\">human serum<\/a> overview \u2013 all grades (mixed donors, Type AB, off-the-clot, male-only), EU stock, lot reservation up to 36 months.<\/p>\n<\/div>\n\n<!-- ANSWER BOX \u2014 Featured Snippet target -->\n<div class=\"sb-bpwhs-answer\">\n  <p class=\"label\">Quick answer<\/p>\n  <p><strong>Human serum<\/strong> is the clear, straw-coloured liquid that remains after human blood is allowed to clot and the clot is removed by centrifugation. It contains proteins (albumin, globulins, fibronectin), growth factors (PDGF, EGF, TGF-\u03b2), hormones, lipids, and cytokines \u2014 but not the clotting factors fibrinogen and prothrombin, which are consumed during clot formation. In cell culture, human serum supplements basal media to support cell attachment, proliferation and function in species-matched, physiologically relevant conditions \u2014 particularly for primary human cells, PBMCs, immunoassay development, and ATMP manufacturing where the xenogeneic components of FBS are unacceptable.<\/p>\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\">How Human Serum Is Made<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding the production process explains why serum composition differs between types and why the collection method matters for your application.<\/p>\n\n\n\n<div class=\"sb-bpwhs-card\">\n  <h3>Off-the-clot (OTC) serum \u2014 the standard process<\/h3>\n  <p>Whole blood is collected from screened donors into containers without anticoagulant. The blood is allowed to clot naturally at room temperature (typically 30\u201360 minutes). During clotting, fibrinogen is converted to fibrin by thrombin, forming a solid clot that entraps red cells and platelets. The clot contracts and the remaining liquid \u2014 serum \u2014 is separated by centrifugation. Crucially, the platelet degranulation during clotting releases growth factors (PDGF, EGF, TGF-\u03b21, IGF-1) from platelet alpha-granules into the serum, giving off-the-clot serum a higher growth factor concentration than plasma or plasma-derived serum.<\/p>\n\n  <h3>Plasma-derived (recalcified) serum \u2014 the apheresis route<\/h3>\n  <p>Plasma is first collected via plasmapheresis (apheresis) using an anticoagulant \u2014 typically sodium citrate or ACD-A. To produce serum from this plasma, calcium chloride is added to overcome the citrate anticoagulation and force clotting. The resulting serum has similar protein composition to OTC serum but slightly lower growth factor concentrations (platelet activation is less complete) and contains residual citrate. Plasma-derived serum is available in much larger lot volumes \u2014 apheresis yields 600\u2013800 mL per session vs. ~200 mL from whole blood \u2014 which is an advantage for IVD calibrator manufacturing and bulk research use.<\/p>\n<\/div>\n\n\n\n<div class=\"sb-bpwhs-hl\">\n  <strong>Serum vs. plasma \u2014 the key difference:<\/strong> Plasma retains all clotting factors (fibrinogen, prothrombin, factors V, VIII etc.) because it is collected with anticoagulant and never allowed to clot. Serum has had these factors removed through clot formation. If your application requires intact coagulation cascade activity, you need plasma, not serum.\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\">Types of Human Serum \u2014 A Complete Classification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Human serum is not a single product \u2014 it is a family of products defined by donor characteristics, processing treatments, and collection method. Choosing the wrong type is one of the most common sources of variability in immunology and diagnostics work.<\/p>\n\n\n\n<div class=\"sb-bpwhs-types\">\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Blood Type<\/span>\n    <h3>Type AB Serum<\/h3>\n    <p>Contains no anti-A or anti-B antibodies. The universal format \u2014 compatible with cells from all blood types. <strong>Required<\/strong> for PBMC assays, ATMP manufacturing, and any allogeneic application.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Donor Sex<\/span>\n    <h3>Male-Only Serum<\/h3>\n    <p>Excludes anti-HLA antibodies that can develop in pregnant female donors. Reduces background cytotoxicity in MLR and allogeneic PBMC assays. Standard spec for most immunology applications.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Pool Size<\/span>\n    <h3>Pooled Serum (\u226520 donors)<\/h3>\n    <p>Averages out individual donor variability in growth factor and immunoglobulin content. Best lot-to-lot consistency. Standard for large-scale assay development and calibrator manufacturing.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Pool Size<\/span>\n    <h3>Single-Donor Serum<\/h3>\n    <p>Fully traceable to one donor unit. Required for autologous applications. Also used in research where donor-specific variability is the experimental variable.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Processing<\/span>\n    <h3>Heat-Inactivated (HI)<\/h3>\n    <p>56 \u00b0C for 30 minutes destroys complement activity. Required for T-cell and NK cell expansion, ELISPOT and MLR assays where complement-mediated lysis would confound results.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Processing<\/span>\n    <h3>Native (Non-HI)<\/h3>\n    <p>Complement activity intact. Used where complement function is part of the biological read-out, or where heat inactivation would denature assay-critical proteins.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Processing<\/span>\n    <h3>IgG-Depleted<\/h3>\n    <p>Protein A\/G chromatography removes IgG below detection limit. Required for hybridoma supernatant purification via Protein A, and for assays where endogenous human IgG would interfere with the antibody-based detection system.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Processing<\/span>\n    <h3>Gamma-Irradiated<\/h3>\n    <p>Additional viral safety measure \u2014 inactivates enveloped and non-enveloped viruses. Specified in some GMP ATMP protocols as a supplementary safety step beyond standard donor screening.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Collection<\/span>\n    <h3>Off-the-Clot (OTC)<\/h3>\n    <p>Higher growth factor content \u2014 native platelet degranulation during clotting. Best performance in growth-factor-dependent primary cell culture and CAR-T expansion.<\/p>\n  <\/div>\n  <div class=\"sb-bpwhs-type-card\">\n    <span class=\"tc-label\">Collection<\/span>\n    <h3>Plasma-Derived<\/h3>\n    <p>Made by recalcifying apheresis plasma. Available in larger lot volumes \u2014 600\u2013800 mL per donor session. Preferred for IVD calibrator manufacturing and bulk research use.<\/p>\n  <\/div>\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\">What Does Human Serum Contain?<\/h2>\n\n\n\n<div class=\"sb-bpwhs-table-wrap\">\n  <table class=\"sb-bpwhs-table\">\n    <thead>\n      <tr><th>Component Class<\/th><th>Key Examples<\/th><th>Function in Cell Culture<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td><strong>Transport proteins<\/strong><\/td><td>Albumin (35\u201350 g\/L), transferrin, \u03b1\u2082-macroglobulin<\/td><td>Carrier for lipids, hormones, drugs; buffering; osmotic pressure<\/td><\/tr>\n      <tr><td><strong>Growth factors<\/strong><\/td><td>PDGF-AB\/BB, EGF, TGF-\u03b21, IGF-1<\/td><td>Cell proliferation, attachment, differentiation signals<\/td><\/tr>\n      <tr><td><strong>Immunoglobulins<\/strong><\/td><td>IgG, IgA, IgM, IgE<\/td><td>Passive immune protection; potential assay interference in hybridoma\/mAb work<\/td><\/tr>\n      <tr><td><strong>Complement proteins<\/strong><\/td><td>C1\u2013C9, factor B, properdin<\/td><td>Removed by heat inactivation for cell culture; relevant in complement assays<\/td><\/tr>\n      <tr><td><strong>Coagulation proteins<\/strong><\/td><td>Absent \u2014 consumed during clotting (fibrinogen \u2192 fibrin clot)<\/td><td>N\/A in serum (present in plasma)<\/td><\/tr>\n      <tr><td><strong>Lipids &amp; hormones<\/strong><\/td><td>Cholesterol, HDL\/LDL, cortisol, insulin, thyroid hormones<\/td><td>Membrane biosynthesis, metabolic support<\/td><\/tr>\n      <tr><td><strong>Cytokines<\/strong><\/td><td>IL-6, IL-8, TNF-\u03b1 (at low baseline levels)<\/td><td>Baseline immune tone \u2014 relevant for cytokine assay background control<\/td><\/tr>\n      <tr><td><strong>Electrolytes<\/strong><\/td><td>Na\u207a, K\u207a, Ca\u00b2\u207a, Mg\u00b2\u207a, Cl\u207b<\/td><td>Osmolality, ion channel function<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\">Applications in Cell Culture: Where Human Serum Outperforms FBS<\/h2>\n\n\n\n<div class=\"sb-bpwhs-card\">\n  <h3>Primary human cell culture<\/h3>\n  <p>Primary cells derived from human donors \u2014 fibroblasts, endothelial cells, keratinocytes, chondrocytes, hepatocytes \u2014 have evolved to function in a human biochemical environment. When cultured in media supplemented with FBS, they are exposed to bovine proteins that differ structurally and functionally from their human counterparts: bovine albumin, bovine transferrin, bovine growth factors. For primary human cells where species matching is important for phenotypic fidelity \u2014 particularly in drug testing and disease modelling \u2014 human serum provides a more physiological matrix that better preserves native cell behaviour.<\/p>\n\n  <h3>PBMC isolation and immunoassays<\/h3>\n  <p>Human peripheral blood mononuclear cells (PBMCs) are the central effector population in immunology assays \u2014 ELISPOT, mixed lymphocyte reaction (MLR), cytokine release assays, NK cell cytotoxicity, and T-cell activation studies. FBS is unsuitable for these applications because bovine IgG cross-reacts with anti-human antibodies in detection systems, bovine complement can non-specifically lyse human cells, and xenogeneic proteins trigger background T-cell responses that inflate assay noise. Human AB serum \u2014 heat-inactivated, from male donors \u2014 eliminates all three sources of interference and is the field standard for PBMC-based immunoassays.<\/p>\n\n  <h3>ATMP and cell therapy manufacturing<\/h3>\n  <p>CAR-T cells, NK cells, TILs, and MSCs intended for clinical use must be manufactured under xeno-free conditions wherever possible \u2014 a regulatory expectation that is becoming progressively stronger across EMA, FDA and PMDA frameworks. Human serum Type AB provides a xeno-free alternative to FBS that supports T-cell and NK cell expansion with equivalent or superior fold expansion and phenotype maintenance. For allogeneic ATMP platforms, pooled AB serum from \u226520 donors provides the lot consistency required for reproducible manufacturing campaigns.<\/p>\n\n  <h3>Viral vector production (HEK293, Vero)<\/h3>\n  <p>HEK293 cells \u2014 the workhorse of AAV and lentiviral vector production \u2014 are human embryonic kidney cells. They perform optimally in a human matrix. Human serum at 5\u201310% in DMEM or DMEM\/F12 supports higher transfection efficiency and better post-transfection cell viability than standard FBS in many AAV8 and AAV9 production protocols, particularly during the 72 h post-transfection harvest window when cell health is most critical.<\/p>\n\n  <h3>IVD assay calibrators, controls and matrix-matched validation<\/h3>\n  <p>Human serum is the biologically correct matrix for immunoassay calibrators because it matches the actual patient sample type \u2014 avoiding the matrix mismatch effects (hook effect, non-specific binding, matrix viscosity differences) that occur when calibrators are prepared in buffer or bovine serum. Pooled multi-donor AB serum provides the large, homogeneous lots needed for serial calibrator production. For IVD manufacturers under IVDR, using human serum as the calibrator matrix is increasingly standard practice for assays whose intended clinical sample is human serum.<\/p>\n\n  <h3>Hybridoma culture and mAb production<\/h3>\n  <p>Standard hybridoma culture uses FBS \u2014 but at 10\u201320%, bovine IgG at ~10\u201312 mg\/mL contaminates the supernatant and co-purifies with the target monoclonal antibody on Protein A columns. Switching to Ultra Low IgG FBS (&lt;5 \u03bcg\/mL IgG) or IgG-depleted human serum eliminates this contamination without changing the culture medium formulation significantly. For clinical hybridoma clones where xeno-free conditions are specified, IgG-depleted human AB serum provides the ideal supplement.<\/p>\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\">Human Serum vs. FBS vs. hPL: Which Supplement for Your Application?<\/h2>\n\n\n\n<div class=\"sb-bpwhs-table-wrap\">\n  <table class=\"sb-bpwhs-table\">\n    <thead>\n      <tr><th>Application<\/th><th>FBS<\/th><th>Human Serum AB<\/th><th>hPL (Human Platelet Lysate)<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td>General mammalian cell lines (CHO, BHK, Vero)<\/td><td class=\"sb-bpwhs-ok\">First choice<\/td><td>Works \u2014 more expensive<\/td><td>Not typical<\/td><\/tr>\n      <tr><td>Primary human cells<\/td><td class=\"sb-bpwhs-warn\">Suboptimal \u2014 species mismatch<\/td><td class=\"sb-bpwhs-ok\">Good choice<\/td><td class=\"sb-bpwhs-ok\">Excellent \u2014 high GF content<\/td><\/tr>\n      <tr><td>PBMC \/ immunoassays<\/td><td class=\"sb-bpwhs-no\">Not suitable \u2014 bovine IgG interference<\/td><td class=\"sb-bpwhs-ok\">Standard<\/td><td class=\"sb-bpwhs-warn\">Not typical \u2014 heparin interference risk<\/td><\/tr>\n      <tr><td>ELISPOT \/ MLR \/ CRA<\/td><td class=\"sb-bpwhs-no\">Not suitable<\/td><td class=\"sb-bpwhs-ok\">Standard \u2014 use HI, AB, male<\/td><td class=\"sb-bpwhs-warn\">Some protocols work; check heparin<\/td><\/tr>\n      <tr><td>CAR-T \/ T-cell expansion<\/td><td class=\"sb-bpwhs-warn\">Acceptable in research; discouraged for GMP<\/td><td class=\"sb-bpwhs-ok\">Good \u2014 xeno-free, AB type<\/td><td class=\"sb-bpwhs-ok\">Excellent \u2014 GMP-grade available<\/td><\/tr>\n      <tr><td>MSC expansion<\/td><td class=\"sb-bpwhs-warn\">Standard in research; not xeno-free<\/td><td>Works<\/td><td class=\"sb-bpwhs-ok\">Gold standard \u2014 highest fold expansion<\/td><\/tr>\n      <tr><td>HEK293 \/ AAV production<\/td><td>Standard<\/td><td class=\"sb-bpwhs-ok\">Better species match \u2014 try 5\u201310%<\/td><td>Not standard<\/td><\/tr>\n      <tr><td>IVD calibrators \/ controls<\/td><td class=\"sb-bpwhs-no\">Matrix mismatch with human clinical sample<\/td><td class=\"sb-bpwhs-ok\">Correct matrix \u2014 use pooled AB<\/td><td>Not appropriate<\/td><\/tr>\n      <tr><td>Hybridoma \/ mAb production<\/td><td class=\"sb-bpwhs-warn\">IgG contamination issue \u2014 use Ultra Low IgG<\/td><td>IgG-depleted variant required<\/td><td>Not typical<\/td><\/tr>\n      <tr><td>ATMP \u2014 GMP manufacturing<\/td><td class=\"sb-bpwhs-warn\">Discouraged where xeno-free is feasible<\/td><td class=\"sb-bpwhs-ok\">Suitable \u2014 verify GMP documentation<\/td><td class=\"sb-bpwhs-ok\">Preferred for MSC\/T-cell GMP<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\">How to Select the Right Human Serum Format<\/h2>\n\n\n\n<div class=\"sb-bpwhs-card\">\n  <h3>Step 1 \u2014 Define the application requirement<\/h3>\n  <p>Start with the question: does your application involve human immune cells, allogeneic donor material, or a clinical sample matrix? If yes, Type AB is non-negotiable. If the application is basic cell culture or cell line maintenance, blood type is less critical but AB remains the safest default.<\/p>\n\n  <h3>Step 2 \u2014 Decide on heat inactivation<\/h3>\n  <p>Use heat-inactivated (HI) serum for: T-cell \/ NK cell expansion, ELISPOT, MLR, cytotoxicity assays, any application where complement activity could cause background lysis. Use native (non-HI) serum for: applications where complement is part of the assay biology, or where heat-labile growth factors (e.g. PDGF, EGF) are critical for cell performance.<\/p>\n\n  <h3>Step 3 \u2014 Pooled vs. single donor<\/h3>\n  <p>Use pooled (\u226520 donors) for: reproducible large-scale experiments, calibrator and control manufacturing, any run where lot-to-lot consistency matters more than donor traceability. Use single donor for: autologous studies, research where donor variability is the experimental variable, or applications requiring full chain-of-custody traceability per donor unit.<\/p>\n\n  <h3>Step 4 \u2014 Confirm additional specifications<\/h3>\n  <p>For GMP and regulated applications: request full viral screening documentation per lot (not per process), CoA with endotoxin (&lt;5 EU\/mL standard; &lt;1 EU\/mL for critical applications), mycoplasma result, sterility (Ph. Eur. or USP), and TSE\/vCJD risk assessment. For IVD use: specify citrate or EDTA plasma-derived serum format if coagulation factor status is relevant to your assay. For research use: standard off-the-clot AB serum with CoA is typically sufficient.<\/p>\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\">Storage, Handling and Lot Qualification<\/h2>\n\n\n\n<div class=\"sb-bpwhs-card\">\n  <h3>Storage<\/h3>\n  <p>Store human serum at \u221220 \u00b0C (long-term) or 2\u20138 \u00b0C for up to 30 days after thawing. Avoid repeated freeze-thaw cycles \u2014 each cycle degrades labile growth factors and increases the risk of protein precipitation. Aliquot into working volumes before freezing; do not refreeze thawed material.<\/p>\n\n  <h3>Thawing<\/h3>\n  <p>Thaw at 37 \u00b0C water bath with gentle agitation \u2014 do not exceed 37 \u00b0C. Do not thaw at room temperature for extended periods, as this promotes protein aggregation. Swirl gently after thawing to homogenise \u2014 do not vortex.<\/p>\n\n  <h3>Lot qualification \u2014 what to assess<\/h3>\n  <ul class=\"sb-bpwhs-list\">\n    <li>Cell proliferation assay: growth rate within \u00b115% of reference lot<\/li>\n    <li>Functional assay: performance in your actual application (cytokine response, transduction efficiency, antibody titre etc.)<\/li>\n    <li>Endotoxin: LAL test \u2014 confirm result matches CoA<\/li>\n    <li>Sterility: run in-house mycoplasma PCR on received material<\/li>\n    <li>Haemoglobin: visual check + CoA value (&lt;20 mg\/dL standard)<\/li>\n    <li>Viral screening: review per-lot documentation \u2014 HIV, HCV, HBV, syphilis (NAT + serology)<\/li>\n  <\/ul>\n\n  <h3>Lot reservation<\/h3>\n  <p>Once a lot passes qualification, reserve the remaining volume with your supplier before it is sold. In practice, the best-performing lots of human serum are in high demand \u2014 especially AB male pooled lots with low endotoxin. Reserve before you need the volume, not when the current lot is running out.<\/p>\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\">Batch-to-Batch Variability: Why It Matters and How to Manage It<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Human serum has inherent biological variability between lots \u2014 far less than single-donor units, but still measurable when working with sensitive primary cell applications. Sources of variability include: seasonal variation in donor growth factor profiles, differences in collection timing relative to last meal (affecting lipid and glucose content), natural variation in immunoglobulin concentration between donor pools, and small differences in complement activity between lots.<\/p>\n\n\n\n<div class=\"sb-bpwhs-hl\">\n  <strong>The most effective mitigation:<\/strong> Reserve large lots (1\u20135 L or more for production-scale users) when a lot passes qualification. Pooled lots from \u226520 donors reduce the statistical impact of individual outlier donors. For critical applications, run a side-by-side validation of two lots before the first lot expires \u2014 so you always have a qualified backup.\n<\/div>\n\n\n\n<!-- CTA -->\n\n<div class=\"sb-bpwhs-cta\">\n  <h2>Human Serum AB \u2014 EU &amp; US Origin, 10 Variants, No MOQ<\/h2>\n  <p>Off-the-clot and plasma-derived \u00b7 Type AB \u00b7 Male-only available \u00b7 Heat-inactivated \u00b7 IgG-depleted \u00b7 Gamma-irradiated \u00b7 Pooled and single-donor \u00b7 Full CoA per lot including viral screening, endotoxin, sterility and mycoplasma \u00b7 Shipped from Germany with cold-chain logistics.<\/p>\n  <a href=\"https:\/\/seamlessbio.de\/human-sera-plasma-and-more\/\" class=\"btn\">View Human Serum Portfolio<\/a>\n  <a href=\"https:\/\/seamlessbio.de\/contact\/\" class=\"btn outline\">Request a Test Lot<\/a>\n<\/div>\n\n\n\n<!-- FAQ -->\n\n<div class=\"sb-bpwhs-faq\">\n  <h2>Frequently Asked Questions About Human Serum<\/h2>\n\n  <details>\n    <summary>What is the difference between human serum and human plasma?<\/summary>\n    <div class=\"body\">Human serum is the liquid fraction that remains after blood is allowed to clot and the clot is removed. It contains proteins, growth factors, lipids and hormones, but <em>not<\/em> the clotting factors (fibrinogen, prothrombin, factors V, VIII etc.) because these are consumed in clot formation. Human plasma is blood collected with an anticoagulant \u2014 citrate, EDTA or heparin \u2014 which prevents clotting. Plasma retains all clotting factors and is the correct material when intact coagulation activity is needed (coagulation assays, haematology testing). For cell culture, serum and plasma serve different purposes: serum for growth support and immunoassay matrix; plasma for coagulation testing and IVD validation matrices where clotting factors must be present.<\/div>\n  <\/details>\n\n  <details>\n    <summary>Why must human serum be Type AB for PBMC and immunoassays?<\/summary>\n    <div class=\"body\">Blood type determines which ABO antibodies are present in serum. Type A donors carry anti-B antibodies; Type B donors carry anti-A antibodies; Type O donors carry both. These antibodies will cause complement-mediated lysis of cells carrying the corresponding blood group antigens \u2014 which in an allogeneic PBMC assay means some portion of the PBMC population will be killed or suppressed regardless of the experimental variable. Type AB donors carry no anti-A or anti-B antibodies. AB serum is therefore the universal format \u2014 compatible with cells from donors of any blood type \u2014 and is required for any allogeneic immunoassay or ATMP manufacturing process.<\/div>\n  <\/details>\n\n  <details>\n    <summary>What does heat inactivation of human serum do?<\/summary>\n    <div class=\"body\">Heating human serum to 56 \u00b0C for 30 minutes denatures and inactivates the complement system \u2014 the cascade of proteins (C1\u2013C9, factors B, D, properdin) that can lyse cells and opsonise particles. In cell culture, active complement causes non-specific, assay-independent cell death that confounds viability and functional readouts. Heat inactivation eliminates this background lysis and is standard practice for ELISPOT, MLR, T-cell expansion, NK cell assays, and any application where cell survival over 24\u201372 h incubation is critical. The trade-off is partial denaturation of some heat-labile growth factors (PDGF, EGF lose approximately 20\u201330% activity) \u2014 which is why non-heat-inactivated serum is still preferred for growth-factor-dependent applications.<\/div>\n  <\/details>\n\n  <details>\n    <summary>Can human serum replace FBS in standard cell culture?<\/summary>\n    <div class=\"body\">For established mammalian cell lines (CHO, HEK293, Vero, BHK, Jurkat etc.), human serum can replace FBS at equivalent or lower concentrations. Growth kinetics may differ \u2014 off-the-clot human serum has higher PDGF, EGF and TGF-\u03b2 than standard plasma-derived FBS \u2014 so a direct 1:1 substitution at the same percentage may result in faster proliferation and require adjustment. For primary human cells and immune cell applications, human serum is not just a replacement \u2014 it is the preferred supplement from the start. A standard lot validation (proliferation assay + functional assay) should confirm equivalence before switching production-scale processes.<\/div>\n  <\/details>\n\n  <details>\n    <summary>What is IgG-depleted human serum and when is it needed?<\/summary>\n    <div class=\"body\">IgG-depleted human serum has had immunoglobulin G removed by Protein A\/G affinity chromatography, reducing IgG concentration from the normal 7\u201316 g\/L to below 50 \u03bcg\/mL (or undetectable, depending on the grade). It is required in two situations: hybridoma and monoclonal antibody production, where endogenous IgG in the culture medium co-purifies with the target mAb on Protein A columns and must be removed from the starting material to achieve adequate purity; and immunoassays where human IgG in the serum matrix would interfere with the capture-detection antibody pair by competing for binding sites or producing high backgrounds.<\/div>\n  <\/details>\n\n  <details>\n    <summary>How much human serum should I use in my cell culture medium?<\/summary>\n    <div class=\"body\">The standard working concentration for most applications is 5\u201310% human serum in basal medium (RPMI-1640, DMEM, AIM-V). For ELISPOT assays, 5\u201310% heat-inactivated AB serum is typical. For MLR and T-cell expansion, 10% is standard. For primary cell culture where high growth factor support is needed, 10\u201320% may be used. Human serum has a richer growth factor profile than FBS \u2014 particularly in PDGF and EGF \u2014 so higher concentrations can accelerate proliferation beyond what is wanted in some protocols. Always validate the optimal concentration for your specific cell type and assay.<\/div>\n  <\/details>\n\n  <details>\n    <summary>Where can I buy human serum in Germany, Austria or Switzerland?<\/summary>\n    <div class=\"body\">SeamlessBio supplies human serum AB in multiple formats \u2014 off-the-clot, heat-inactivated, male-only, IgG-depleted, gamma-irradiated \u2014 from certified EU and US donor centres, processed and shipped from Germany. No minimum order quantity. Full documentation per lot: CoA, CoO, viral screening (HIV, HCV, HBV, syphilis), endotoxin, sterility, mycoplasma. Contact info@seamlessbio.de or visit seamlessbio.de\/human-sera-plasma-and-more\/ to request specifications and a test lot.<\/div>\n  <\/details>\n<\/div>\n\n\n\n<!-- FAQPage JSON-LD -->\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between human serum and human plasma?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Human serum is the liquid fraction remaining after blood clots and the clot is removed \u2014 it lacks clotting factors (fibrinogen, prothrombin) which are consumed in clot formation. Human plasma is collected with an anticoagulant that prevents clotting, so all clotting factors are retained. Serum is used for cell culture and immunoassay matrices; plasma is required for coagulation testing and applications needing intact clotting factor activity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why must human serum be Type AB for PBMC and immunoassays?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Type A donors carry anti-B antibodies; Type B donors carry anti-A antibodies; Type O donors carry both. These antibodies cause complement-mediated lysis of cells bearing the corresponding antigens in allogeneic PBMC assays. Type AB donors carry no anti-A or anti-B antibodies, making AB serum compatible with cells from donors of any blood type \u2014 the universal format required for allogeneic immunoassays and ATMP manufacturing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does heat inactivation of human serum do?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Heating human serum to 56 \u00b0C for 30 minutes inactivates the complement system, eliminating non-specific cell lysis in culture. It is standard for ELISPOT, MLR, T-cell expansion and NK cell assays. The trade-off is partial denaturation of heat-labile growth factors (PDGF, EGF lose approximately 20\u201330% activity), which is why non-heat-inactivated serum is preferred for growth-factor-dependent applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can human serum replace FBS in standard cell culture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes \u2014 for established mammalian cell lines, human serum can replace FBS at equivalent or lower concentrations. Growth kinetics may differ since off-the-clot human serum has higher PDGF, EGF and TGF-\u03b2 than standard FBS. A lot validation confirming proliferation and functional equivalence is recommended before switching production-scale processes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is IgG-depleted human serum and when is it needed?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"IgG-depleted human serum has IgG removed by Protein A\/G chromatography to below 50 \u03bcg\/mL. It is required for hybridoma and mAb production (to prevent co-purification of endogenous IgG) and immunoassays where endogenous human IgG would interfere with the capture-detection system.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How much human serum should I use in cell culture medium?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard working concentration is 5\u201310% in basal medium. For ELISPOT 5\u201310% heat-inactivated AB serum is typical; for MLR and T-cell expansion 10% is standard; for primary cell culture 10\u201320% may be needed. Human serum has a richer growth factor profile than FBS, so higher concentrations can accelerate proliferation beyond desired levels in some protocols.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Where can I buy human serum in Germany, Austria or Switzerland?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"SeamlessBio supplies human serum AB in multiple formats \u2014 off-the-clot, heat-inactivated, male-only, IgG-depleted, gamma-irradiated \u2014 from certified EU and US donor centres, processed and shipped from Germany. No minimum order quantity. Contact info@seamlessbio.de or visit seamlessbio.de\/human-sera-plasma-and-more\/.\"\n      }\n    }\n  ]\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Guide \u00b7 Human Serum \u00b7 Cell Culture \u00b7 October 2026 \u00b7 12 min read What Is Human Serum? Definition, Types and Cell Culture Applications The complete reference guide to human serum \u2014 what it is, how it is made, which type to choose for your application, and how to qualify a lot. Written by a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-9112","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Human Serum? 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