A high or low vitamin B12 blood test result can reflect diet, absorption, supplements, medications, liver disease, kidney function, or blood disorders. Learn how to interpret B12 results, when MMA or homocysteine may help, and what to discuss with a clinician.
A vitamin B12 blood test helps evaluate B12 deficiency, anemia, and neurologic symptoms. Learn how to prepare, what low or borderline results mean, and when MMA testing is useful.
A vitamin B12 blood test often costs about $10–$55 through direct-to-consumer lab ordering, depending on the provider, lab network, and mandatory fees. Compare self-pay prices, what is included, and when a B12 test is only part of the workup.
