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小鼠抑制素A(INHA)檢測(cè)試劑盒在一步法測(cè)定中,當(dāng)標(biāo)本中受檢抗原的含量很高時(shí),過(guò)量抗原分別和固相抗體及酶標(biāo)抗體結(jié)合,而不再形成"夾心復(fù)合物"。類同于沉淀反應(yīng)中抗原過(guò)剩的后帶現(xiàn)象,此時(shí)反應(yīng)后顯色的吸光值(位于抗原過(guò)剩帶上)與標(biāo)準(zhǔn)曲線(位于抗體過(guò)剩帶上)某一抗原濃度的吸光值相同,如按常法測(cè)讀,所得結(jié)果將低于實(shí)際的含量,這種現(xiàn)象被稱為鉤狀效應(yīng)(hook effect),因?yàn)闃?biāo)準(zhǔn)曲線到達(dá)高峰后呈鉤狀彎落。鉤狀效應(yīng)嚴(yán)重時(shí),小鼠抑制素A(INHA)檢測(cè)試劑盒反應(yīng)甚至可不顯色而出現(xiàn)假陰性結(jié)果。因此在使用一步法試劑測(cè)定標(biāo)本中含量可異常增高的物質(zhì)(例如血清中HBsAg、AFP和尿液hCG等)時(shí),應(yīng)注意可測(cè)范圍的zui高值。用高親和力的單克隆抗體制備此類試劑可削弱鉤狀效應(yīng)。假使在被測(cè)分子的不同位點(diǎn)上含有多個(gè)相同的決定簇,例如HBsAg的a決定簇,也可用針對(duì)此決定的同一單抗分別包被固相和制備酶結(jié)合物。但在HBsAg的檢測(cè)中應(yīng)注意亞型問(wèn)題,小鼠抑制素A(INHA)檢測(cè)試劑盒HBsAg有adr、adw、ayr、ayw4個(gè)亞型,雖然每種亞型均有相同的a決定簇的反應(yīng)性,這也是用單抗作夾心法應(yīng)注意的問(wèn)題。

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