What is the purpose of warming the finger before performing a capillary blood collection?

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Multiple Choice

What is the purpose of warming the finger before performing a capillary blood collection?

Warming the finger increases blood flow to the surface by causing vasodilation of the small surface vessels. When the vessels dilate, more capillary blood comes close to the skin, making it easier to obtain a free-flowing drop for capillary collection. This improves sample quality and reduces the need to squeeze, which can introduce tissue fluid or alter the sample. Warming is not for sterilizing the skin, it doesn’t numb the finger, and it doesn’t shrink capillaries; it actually helps them dilate. A warm, damp cloth for a few minutes is a common way to prep the finger.

Warming the finger increases blood flow to the surface by causing vasodilation of the small surface vessels. When the vessels dilate, more capillary blood comes close to the skin, making it easier to obtain a free-flowing drop for capillary collection. This improves sample quality and reduces the need to squeeze, which can introduce tissue fluid or alter the sample. Warming is not for sterilizing the skin, it doesn’t numb the finger, and it doesn’t shrink capillaries; it actually helps them dilate. A warm, damp cloth for a few minutes is a common way to prep the finger.

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