A blood test is a laboratory analysis performed on a blood sample that is usually extracted from a vein in the arm using a hypodermic needle, or via fingerprick. Modern hospital hematology laboratory.

A blood test is a laboratory analysis performed on a blood sample that is usually extracted from a vein in the arm using a hypodermic needle, or via fingerprick. Modern hospital hematology laboratory. - 142672774

Closeup of a surgeon doing an operation on a patient's arm

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