Kapillarblut

Kapillarblut is blood that is obtained from capillaries, which are the smallest blood vessels in the body. This method of blood collection is commonly used for diagnostic tests where only a small sample is required. Capillary blood collection is often performed by pricking a fingertip, earlobe, or heel, particularly in infants, with a lancet. The resulting drop of blood is then collected, typically using a capillary tube or by applying it directly to a test strip.

The composition of capillary blood differs slightly from venous blood due to the exchange of substances with the surrounding tissues. It contains a mixture of blood from arterioles, venules, and capillaries. While generally sufficient for many routine tests, there are instances where venous blood is preferred for greater accuracy or to avoid potential inaccuracies caused by factors like dilution or tissue fluid contamination.

Common applications for capillary blood testing include blood glucose monitoring for diabetes management, hemoglobin testing for anemia, and rapid diagnostic tests for certain infectious diseases. The procedure is generally less invasive and quicker than venipuncture, making it a convenient option for point-of-care testing and for individuals who have difficulty with traditional blood draws. However, proper technique is essential to ensure sample integrity and patient comfort.