凝集（英语：Agglutination）或凝集反应，是将抗原与其相应的称为同种凝集素[1]（isoagglutinin）的抗体混合时发生的反应，此术语常用于血型分类。在血液发生凝集后，可出现肉眼可见的小块状物质。
参考
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