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.
Update Date 4/24/2013
Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.