Vitamin B12

B vitamins are nutrients that your body needs to work well and stay healthy. There are eight different types. A vitamin B test checks the level of one or more B vitamins in a sample of your blood or urine (pee).

Vitamin B testing is used if you have symptoms that suggest you may not be getting enough of one or more B vitamins. For example, a vitamin B12 and folate test is often used for symptoms of certain types of anemia.

Source: MedlinePlus, U.S. National Library of Medicine

Normal range

4 published ranges, each from a named source

200800 pg/mL drawn: all ages · American Board of Internal Medicine (Laboratory Test Reference Ranges)

Normal: 180–1245 pg/mL (varies by lab)ABIM 200–800 · ARUP 180–914 · LabCorp 232–1245 pg/mL
Normal: 180–914 ng/L

These labs do not agree: the published adult ranges differ by up to 56%, so the same result can read as normal at one lab and be flagged at another — ABIM 200–800 · ARUP 180–914 · LabCorp 232–1245 pg/mL. Both are real published values, shown as each lab states them.

Ranges from ARUP Laboratories Test Directory, American Board of Internal Medicine (Laboratory Test Reference Ranges), LabCorp Test Directory, Mayo Clinic Laboratories (Test Catalog).

All source ranges (4)

Source	Sex	Age	Range
American Board of Internal Medicine (Laboratory Test Reference Ranges)	All	all ages	200–800 pg/mL
ARUP Laboratories Test Directory	All	all ages	180–914 pg/mL
LabCorp Test Directory	All	all ages	232–1245 pg/mL
Mayo Clinic Laboratories (Test Catalog)	All	all ages	180–914 ng/L

What moves it

cited guidance. not medical advice

Vitamin b12 — address deficiency when low · National Institutes of Health - Office of Dietary Supplements

What an abnormal result can be associated with

A low result: Decreased circulating vitamin B12 concentration

Associations from LOINC2HPO (Human Phenotype Ontology). This is reference information, not a diagnosis: only a clinician can interpret your result in context.

details

Sample: Serum or plasma · LOINC
Collection: Serum gel tube · 0.6 mL · Mayo Clinic Laboratories (Test Catalog)
Part of: Bryan Johnson Blueprint
Listed under: Anemia · B Vitamins · Folic Acid
Code: LOINC 2132-9 · pg/mL
Also known as: Cobalamin (Vitamin B12), Cbl, Cobalamins, Cobalamin

See your own Vitamin B12 Add a lab report and it is drawn against your lab's range, over time. Upload a Blood Test