 [ Symptoms ] does prostate massage help prevent prostate cancer [ Disease ] the normal level of vitamin b12 in the blood is 200 1000ngl the levels of methylmalonic acid are generally high during anemia due to a lack of vitamin b12 or folic acid methylmalonic acid can also be checked with a urine test most hmos cover diagnostic services when medically necessary and prescribed by a participating physician check with your insurance provider for more detailed information about your coverage