what is capillary blanch test
Capillary nail refill test. The nail blanch test, also called the capillary nail refill test, is performed on the nail beds as an indicator of tissue perfusion (the amount of blood flow to tissue) and dehydration.hy 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.