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糞便潛血反應為檢測糞便中Hemoglobin的方法,可以分為化學法與免疫法。兩個檢查有各自的限制存在。
為氧化法,利用血紅素的過氧化酶(peroxidase)特性,改變試紙顏色。若為陽性,代表腸胃道中有血液存在
偽陽性:食物(紅肉、動物血、含過氧化酶的食物);偽陰性:Vit C
做檢驗之前,需要有飲食上的限制