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

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Phlebotomy and venipuncture are both common methods for obtaining a sample of blood from a patient. Phlebotomy is the act of making an incision in a vein with a needle, while venipuncture is the puncture of a vein with a needle to withdraw blood. Both procedures are often interchangeable and can be used in a variety of medical settings. Bone marrow aspiration is a different procedure that involves collecting a small sample of bone marrow using a needle. However, this is not typically used for routine blood tests.

You Can Obtain a Sample of Blood from a Patient