凝集（英語：Agglutination）或凝集反應，是將抗原與其相應的稱為同種凝集素[1]（isoagglutinin）的抗體混合時發生的反應，此術語常用於血型分類。在血液發生凝集後，可出現肉眼可見的小塊狀物質。
參考
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