blanch test [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. See also capillary refill.
