Why blood for analysis taken from the ring finger - ForumDaily
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Why blood for analysis taken from the ring finger

We all donate blood from time to time (general analysis, hormone testing, biochemistry, etc.). In the case of medical examination, blood is mainly taken from a finger, for routine tests - from a vein. The second method, according to experts, is much more popular. For specialists in the laboratory, this is convenient and allows you to take the required amount of material. By the way, it often doesn't matter how your blood was taken - from a finger or from a vein. In any case, it is suitable for most research, writes Life.

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At times, drawing venous blood can be difficult. For example, in infants it is difficult to find a vein, but to damage a small hand is easy. Problems also arise with extensive body burns or if the patient is obese.

“Some patients require regular monitoring of blood counts, and constant blood sampling from a vein can lead to the development of complications: phlebitis (inflammation of the venous wall), scarring, etc. In such cases, they usually resort to capillary blood sampling, ”said Vladimir Mukhin, doctor of clinical laboratory diagnostics of a medical company Labquest.

Capillary blood is taken from a finger, and a ring finger. This is due to the anatomy of the structure of the hand.

“Inside the little finger and thumb, there are tendon sites that communicate with the membranes throughout the hand, so if they are accidentally damaged, you can get an infection that spreads to the entire hand. The index and middle fingers are much more often involved in the work of the hands, therefore, the skin on the pads of these fingers is coarser, which means that it is more difficult to pierce it. The ring finger, on the other hand, has the most delicate skin, so the puncture is easier to perform, the wound heals faster, and there is less discomfort. In addition, the risk of developing serious complications is minimal, ”the doctor explained.

Topic: A man with special blood was a donor for 60 years and saved 2,4 a million children.

But blood from a finger has its drawbacks.

“Unfortunately, no matter how the procedure is performed, this does not guarantee that sufficient blood will flow from the puncture site by gravity, and the laboratory will not reject the obtained sample. The amount of “marriage” (blood clots, insufficient volume for research, and so on) in capillary blood sampling is more than ten times higher than that in venous sampling, ”added Vladimir Mukhin.

By the way, a finger is not always needed for capillary blood sampling. For example, in young children it is usually taken from the heel, less often from the big toe. In older children and adults, blood can even be taken from the earlobe, but this, according to an expert, is a rarity.

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