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Normal B12 ranges typically fall between 200-900 pg/mL, though functional B12 status is better assessed by methylmalonic acid (MMA) and homocysteine levels
Primary Care Guidelines for B12 and Folate Testing Indications for B12 and Folate Testing No need to check B12 levels in patient on parenteral B12 treatment (they will always be high) There is no indication to check GPA or INF purely because of family history of autoimmune disease or hypothyroidism Care should be taken when prescribing folic acid alone If folic acid is given to a patient who is actually b12 deficient, this may precipitate irreversible neurological complications References 1
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The consistency of the therapy often determines how sustained the results will be, particularly for those using it to maintain energy or support ongoing weight management
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