Diagnosis of vitamin B12 deficiency is typically based on measurement of serum vitamin B12 levels; however, about 50 percent of patients with subclinical disease have normal B12 levels. A more sensitive method of screening for vitamin B12 deficiency is measurement of serum methylmalonic acid and homocysteine levels, which are increased early in vitamin B12 deficiency.
OK thats an eye opener right?
Here's the Mayo site........they state MMA..which is the urine MMA
www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/9154
Interesting to note that that little purple pill Nexium they gave me to take for 6 weeks after my cystectomy may have contributed to my quick decline in B12...?? ya think?
So also have your folic acid checked at the same time..that was something i did not know nor did my doctor..Now i know.
Pat