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In medicine, some blood tests are conducted on venous blood obtained by fingerprick. There are various ways of opening a small wound that produces no more than a few drops of blood. The procedure can be painful, but may be quicker and less distressing than venipuncture.
Additional recommended knowledge
After a droplet has formed, venous blood is sucked up by a capillary (a thin glass tube), usually passively or sometimes by indirect suction.
Tests commonly conducted on capillary blood are:
Fingerpricks are sometimes done on children and the elderly, when only a small amount of blood (less than 500 μg) is needed for a test. Neonates (newborn babies) are given heelpricks instead, as this is less likely to cause permanent damage (and because babies have very small fingers).
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Fingerprick". A list of authors is available in Wikipedia.|