当毛细血管血液的还原血红蛋白超过下列哪项数值时,皮肤黏膜即可出现发绀A.100g/L B.80g/L C.60g/L D.50g/L E.40g/L

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问题 当毛细血管血液的还原血红蛋白超过下列哪项数值时,皮肤黏膜即可出现发绀

选项 A.100g/L
B.80g/L
C.60g/L
D.50g/L
E.40g/L

答案D

解析当毛细血管内的还原血红蛋白超过50g/L(5g/dl)时(即血氧未饱和度超过6.5vol/dl),皮肤黏膜可出现发绀。
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