The current gold standard for properly diagnosing B12 deficiency is the Urine MMA Level, due to the lack of sensitivity of the serum B12 test. The serum B12 test may produce false "normal" or "high" indications because of inactive B12 analogs in the blood from foods such as sea vegetables, or due to a body's last ditch dump from its bone marrow stores in response to severe deficiency. Available by mail from Norman Clinical Laboratories.
Your body is a highly complex, interconnected system. Instead of guessing at what might be wrong, let us help you discover what is really going on inside your body based on the many clues it is giving.
Our multiple symptom checker provides in-depth health analysis by The Analyst™ with full explanations, recommendations and (optionally) doctors available for case review and answering your specific questions.