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Clinical laboratories generally define vitamin B12 deficiency as a serum level below 148 pmol/L (approximately 200 pg/mL)
Abiding by the rules is best for now if you play in professional sports
For obesity (Zepbound), use E66.01 (morbid obesity due to excess calories) with a supporting Z68 BMI code
Relative telomere length and mitochondrial DNA copy number variation with age: association with plasma folate and vitamin B12. Mitochondrion 51 (2020): 79-87.
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