A vitamin B-12 level test checks the amount of vitamin B-12 in the blood or urine to gauge

the body’s overall vitamin B-12 stores.Vitamin B-12 is necessary for several bodily

processes, including nerve function and the production of DNA and red blood cells.Normal

values are 160 to 950 picograms per milliliter (pg/mL), or 118 to 701 picomoles per liter

(pmol/L). Normal value ranges may vary slightly among different laboratories. Some labs

use different measurements or may test different samples.