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Nutritional Disorders Message Board
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Old 07-11-2006, 07:48 AM   #1
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just a question

is vitamin b 12 deficiency detected in a cbc. I having dizziness and lightheadedness of an unknown origin, and am wondering if any of my levels are off. But I'm not sure which level will tell anything about b12. Please let me know what to look for. Thanks

 
Old 07-12-2006, 10:28 AM   #2
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Re: just a question

In a routine CBC, the only thing that might indicate a further need for testing (for B12 deficiency) is the MCV value (mean corpuscle volume). If it's higher than normal, this indicates large red blood cells....called macrocytic anemia (I think), which is usually caused by either B12 or folate deficiency. Having a high MCV was my first indicator something was wrong, but when my B12 levels came back in the upper range, it got ignored. Wasn't til a few years later, with worsening symptoms, that low B12 was diagnosed from the methylmalonic acid marker (a better indicator anyway).

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