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How to check for Vitamin B12 deficiency with lab tests: Serum Vitamin B12 levels: should be in the top 75% percentile of the lab reference range (yes even mid-range can still be too low)
Frequently Asked Questions About Vitamin B12 Injections How Often Should I Get Vitamin B12 Injections
However, it's always advisable to read and consult with your doctor
You should consult a doctor if 3 , 11 : Your blood tests show elevated B12 levels without a clear cause
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