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Serum vitamin B12 measurement forms the cornerstone of diagnosis, with levels below 148 pmol/L (200 ng/L) generally considered deficient, though symptoms can occur at higher levels
How much vitamin B12 do I need per day to avoid deficiency
Older adults, vegans and vegetarians, and people on long-term acid-reducing medication often run on the lower end of optimal range without obvious symptoms
General Comments & Additional Information Clinical info: NORMAL REPORT Ordered Items Methylmalonic Acid, Serum Another way to evaluate the physiological value of B12 is by testing total serum homocysteine
PMID 10730193
The inclusion criteria were as follows: (1) patients that met the diagnostic criteria of lateral femoral cutaneous neuritis
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