blanch test

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blanch test

Etymology: Fr, blanchir, to become white; L, testum, crucible

a test of blood circulation in the fingers or toes. Pressure is applied to a fingernail or toenail until normal color is lost. The pressure is then removed, and, if the circulation is normal, color should return almost immediately, within about 2 seconds. The time may be prolonged by dehydration; a compromise of circulation, such as arterial occlusion; hypovolemic shock; or hypothermia. Also called blanching test, capillary refill.

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