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The capillary nail refill test is a quick test done on the nail beds. It is used to monitor dehydration and the amount of blood flow to tissue.
Nail blanch test; Capillary refill time
Pressure is applied to the nail bed until it turns white. This indicates that the blood has been forced from the tissue. It is called blanching. Once the tissue has blanched, pressure is removed.
While the patient holds their hand above their heart, the health care provider measures the time it takes for blood to return to the tissue. Return of blood is indicated by the nail turning back to a pink color.
Remove colored nail polish before this test.
There will be minor pressure to the bed of your nail. This should not cause discomfort.
Tissues need oxygen to survive. Oxygen is carried to various parts of the body by the blood (vascular) system.
This test measures how well the vascular system works in your hands and feet -- the parts of your body that are farthest from the heart.
If there is good blood flow to the nail bed, a pink color should return in less than 2 seconds after pressure is removed.
Blanch times that are greater than 2 seconds may indicate:
White CJ. Atherosclerotic peripheral arterial diseases. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa.: Saunders Elsevier; 2011:chap 79.