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blood test

The definition of a blood test is a scientific examination of your blood.

(noun)

When a doctor wants to find out whether you have a medical condition and has your blood taken with a needle and examined in a lab, this is an example of a blood test.

See blood test in Webster's New World College Dictionary

an examination of a small amount of a person's blood for diagnosis, classification, blood count, etc.
a test to detect the presence of blood that is not visible, as in feces

See blood test in American Heritage Dictionary 4

noun

An analysis of a sample of blood, especially for diagnostic or therapeutic purposes.
The process of obtaining blood for such a test: went to the clinic for a blood test.

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