Description
A vitamin B12 test is a blood test that measures the level of vitamin B12 in the blood, which is crucial for red blood cell production, nerve function, and DNA synthesis. The test is done by drawing a blood sample from the arm and analyzing it in a lab to check for deficiencies, which can cause symptoms like fatigue, nerve problems, or certain types of anemia (like megaloblastic anemia). It may also be ordered as part of a routine check-up or if there is a suspicion of a deficiency due to certain medical conditions or medications.
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