by danibo on May 5th, 2009

danibo

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Why do nails turn pale when pressed

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  • by ptrask on May 5th, 2009

    ptrask

    There are a number of capillaries close underneath the nail. When you press on the nail, it forces the blood out of the capillaries, and the nail appears lighter. When you release it, the blood flows back and the nail "pinks up." When I used to work as an EMT, that was an evaluation tool we were taught. When you press on someone's nail, it should pink up again in less than the time it takes to say capillary refill. Otherwise, there is a circulation problem.

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