Vitamin B-12 $42.06 The vitamin B12 level is a blood test that measures how much vitamin B12 is in your blood. Tests › Vitamin B-12 Add To Cart Added! The vitamin B12 level is a blood test that measures how much vitamin B12 is in your blood. You Might Also Like Alkaline Phosphatase $27.14 Hepatitis B Core Ab, IgM $45.00 Testosterone, Free $55.65 Liver Profile Panel $30.00 B-hCG (beta-human chorionic gonadotropin) $36.00