A capillary sample of blood is obtained by pricking the skin's surface to obtain a drop or several drops of blood for laboratory testing. The usual location of capillary blood sampling is the skin of the finger or heel.
Update Date 5/1/2011
Updated by: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.