A blood test is a medical procedure where a small sample of blood is taken from the body to be analyzed in a lab. It helps doctors check for various health conditions, measure how well organs like the liver and kidneys are working, and see if treatments are effective. Blood tests can identify infections, monitor chronic diseases, and check for substances like glucose, cholesterol, and hormones. The sample is usually taken from a vein in the arm using a needle, and the procedure is quick and rather painless.

What is a "blood test"?

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“blood test”的英语定义和含义

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