You can obtain a sample of blood from a patient by doing a:

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Phlebotomy and venipuncture are both methods of obtaining blood samples from a patient. Phlebotomy involves the puncture of a vein in the arm, while venipuncture is a general term for any puncture of a vein. Both methods are commonly used and relatively simple ways to obtain blood samples for testing. Bone marrow aspiration is a more invasive procedure that involves extracting bone marrow from a patient's hip bone using a needle. While bone marrow aspiration can provide valuable diagnostic information, it is typically only done in cases where a blood sample is not sufficient.

You Can Obtain a Sample of Blood from a Patient