Capillary nail refill test
Definition
The capillary nail refill test is a quick test performed on the nail beds to monitor dehydration and the amount of blood flow to tissue.
Alternative Names
Nail blanch test; Capillary refill time
Why the test is performed
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.
How the test is performed
Pressure is applied to the nail bed until it turns white, indicating that the blood has been forced from the tissue. This is called blanching. Once the tissue has blanched, pressure is removed.
The health care provider will measure the time it takes for blood to return to the tissue, indicated by a pink color returning to the nail.
How to prepare for the test
Colored nailpolish should be removed before this test.
How the test will feel
There will be minor pressure to the bed of your nail, which should not cause discomfort.
What the risks are
No risks are associated with this test.
Normal Values
If there is good blood flow to the nail bed, a pink color should return in less than 2 seconds after pressure is removed.
What abnormal results mean
Blanch times that are greater than 2 seconds may indicate:
Review Date: 6/25/2007
Reviewed By: Arnold L. Lentnek, MD, Division of Infectious Disease, Kennestone Hospital, Marietta, GA. Review provided by VeriMed Healthcare Network.
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