{"id":2973,"date":"2026-08-22T21:03:41","date_gmt":"2026-08-22T20:03:41","guid":{"rendered":"https:\/\/seamlessbio.de\/?page_id=2973"},"modified":"2026-08-23T00:39:48","modified_gmt":"2026-08-22T23:39:48","slug":"what-is-human-ab-serum","status":"publish","type":"page","link":"https:\/\/seamlessbio.de\/de\/what-is-human-ab-serum\/","title":{"rendered":"What is Human AB Serum?"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"2973\" class=\"elementor elementor-2973\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-29e852e e-con e-atomic-element e-flexbox-base e-50ece16\" data-id=\"29e852e\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"29e852e\">\n    \t\t<div class=\"elementor-element elementor-element-8fce7af elementor-widget elementor-widget-html\" data-id=\"8fce7af\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- \nWORDPRESS PAGE \u2014 GUTENBERG \"BENUTZERDEFINIERTES HTML\" BLOCK\nSlug: what-is-human-ab-serum\nSEO Title: What is Human AB Serum? \u2014 Definition & Cell Culture Uses | SeamlessBio\nMeta Description: What is human AB serum, why type AB, when does it outperform FBS, and which applications require it? Complete definition from SeamlessBio.\nFocus Keyword: what is human AB serum\nAdditional Keywords: human AB serum cell culture definition, type AB human serum PBMC, human AB serum vs FBS\nMenu: Resources \u2192 Glossary\n-->\n<div style=\"background:#e9fbfa;border-left:4px solid #18b7b2;border-radius:0 8px 8px 0;padding:20px 24px;margin-bottom:32px;\">\n<p style=\"font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:#139b97;margin-bottom:8px;\">Quick Definition<\/p>\n<p style=\"font-size:16px;margin:0;\"><strong>What is Human AB Serum?:<\/strong> Human AB serum is whole human serum from donors with blood group AB \u2014 containing neither anti-A nor anti-B antibodies. This makes it compatible with cells from any ABO blood group donor without triggering agglutination or complement-mediated lysis, which is why virtually all human serum used in cell culture is type AB.<\/p>\n<\/div>\n<h2>When does human AB serum outperform FBS?<\/h2>\n<p>Human AB serum is essential (not just preferred) for: PBMC assays and ELISpot where FBS endotoxin-driven monocyte activation creates unacceptable background; IVD calibrator and diagnostic matrix development where a human matrix is required; and plasma stability assays in DMPK where human esterase activity is needed. For primary human cells \u2014 fibroblasts, endothelial cells, keratinocytes \u2014 human AB serum often gives higher proliferation rates than FBS because growth factors are species-matched.<\/p>\n<h2>Key Facts<\/h2>\n<ul>\n<li>Type AB donors have neither anti-A nor anti-B antibodies \u2014 universal serum type for all cell culture applications<\/li>\n<li>Contains ~8\u201312 mg\/mL human IgG \u2014 much higher than FBS (50\u2013200 \u00b5g\/mL bovine IgG)<\/li>\n<li>Heat inactivated (HI) grade: complement inactivated at 56\u00b0C for 30 min \u2014 standard for PBMC and immune cell assays<\/li>\n<li>Essential for PBMC and ELISpot assays \u2014 FBS endotoxin activates monocytes non-specifically via TLR4, creating high background cytokine signal<\/li>\n<li>Used in plasma stability assays (DMPK) as human-relevant matrix with physiological esterase activity<\/li>\n<li>Available from SeamlessBio: EU and US origin, mixed donors and male-only pools, native and heat inactivated<\/li>\n<\/ul>\n<h2>Further Reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/seamlessbio.de\/de\/ressourcen\/blog\/human-ab-serum-cell-culture-guide\/\">Human AB Serum \u2014 Complete Guide<\/a><\/li>\n<li><a href=\"https:\/\/seamlessbio.de\/de\/what-is-off-the-clot-serum\/\">What is Off-the-Clot Serum?<\/a><\/li>\n<li><a href=\"https:\/\/seamlessbio.de\/de\/what-is-human-platelet-lysate-hpl\/\">What is hPL?<\/a><\/li>\n<li><a href=\"https:\/\/seamlessbio.de\/de\/produkte\/menschliches-serum\/\">Human Serum Portfolio<\/a><\/li>\n<\/ul>\n<div style=\"background:#f4f6f7;border-radius:12px;padding:32px;text-align:center;margin-top:40px;\">\n<p style=\"font-size:18px;font-weight:700;color:#1a2e35;margin-bottom:12px;\">Human AB Serum \u2014 Mixed Donors & Male-Only | SeamlessBio<\/p>\n<a href=\"https:\/\/seamlessbio.de\/de\/produkte\/menschliches-serum\/\" style=\"background:#18b7b2;color:#fff;padding:12px 28px;border-radius:50px;font-size:13px;font-weight:700;text-decoration:none;\">View Product \u2192<\/a>\n&nbsp;&nbsp;\n<a href=\"https:\/\/seamlessbio.de\/de\/kontakt\/\" style=\"border:2px solid #18b7b2;color:#139b97;padding:10px 28px;border-radius:50px;font-size:13px;font-weight:700;text-decoration:none;\">Muster anfordern<\/a>\n<\/div>\n<p style=\"font-size:13px;color:#6b7f82;margin-top:32px;border-top:1px solid #d8e8e7;padding-top:16px;\">\n<em>SeamlessBio GmbH \u00b7 Passau, Germany \u00b7 <a href=\"mailto:info@seamlessbio.de\">info@seamlessbio.de<\/a><\/em>\n<\/p>\t\t\t\t<\/div>\n\t\t\n<\/div>\n\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Quick Definition What is Human AB Serum?: Human AB serum is whole human serum from donors with blood group AB \u2014 containing neither anti-A nor anti-B antibodies. This makes it [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","footnotes":""},"class_list":["post-2973","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Human AB Serum? \u2014 Definition &amp; Cell Culture Uses<\/title>\n<meta name=\"description\" content=\"What is human AB serum, why type AB, when does it outperform FBS, and which applications require it? 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