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[61] The classic test for PA, the Schilling test, is no longer widely used, as more efficient methods are available
B12 shots use intramuscular injection, depositing vitamin B12 directly into muscle tissue, typically in the upper arm or thigh
The results were expressed in micromoles per deciliter and reported as changes from the baseline values
A serum B12 level test and, ideally, a methylmalonic acid (MMA) test should precede any B12 injection recommendation
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