Cobalamin (Vitamin B12) normal range — check your value

Roughly 200 to 900 pg/mL. Between 200 and 300 is a grey zone where symptoms and a homocysteine test help decide whether to treat.

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Your Cobalamin (Vitamin B12) test value

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Cobalamin (Vitamin B12)

pg/mL

What Cobalamin (Vitamin B12) measures

A vitamin obtained almost entirely from animal foods, required to build red blood cells and maintain nerve insulation.

Cobalamin (Vitamin B12) normal range chart

ResultCobalamin (Vitamin B12) (pg/mL)

Below rangeBelow 200

Borderline200 – 300

In range300 – 900

Above range900 and above

These bands are for female, 31–45 years. Enter your age and gender above to see the bands for you. The table below shows the range for every age and gender.

Cobalamin (Vitamin B12) normal range by age and gender

AgeMaleFemale

0–1 years200 – 900 pg/mL200 – 900 pg/mL

2–6 years187 – 883 pg/mL187 – 883 pg/mL

7–11 years187 – 883 pg/mL187 – 883 pg/mL

12–17 years187 – 883 pg/mL187 – 883 pg/mL

18–30 years187 – 883 pg/mL187 – 883 pg/mL

31–45 years187 – 883 pg/mL187 – 883 pg/mL

46–60 years187 – 883 pg/mL187 – 883 pg/mL

60 years and above187 – 883 pg/mL187 – 883 pg/mL

What a high Cobalamin (Vitamin B12) means, and common causes

B12 is above range, which almost always reflects recent supplements or injections rather than a problem. A high level without supplements occasionally deserves a look.

Common causes: B12 tablets or injections, and uncommonly liver disease, kidney disease or a myeloproliferative disorder.

What a low Cobalamin (Vitamin B12) means, and common causes

B12 is below range. Deficiency damages nerves and red cell production, and the nerve damage can become permanent if it is left long enough.

Common causes: Vegetarian and vegan diets, which is the leading cause in India since B12 comes almost entirely from animal foods. Also long-term metformin or acid-reducing tablets, pernicious anaemia, gastric surgery, and malabsorption.

Frequently asked questions

Roughly 200 to 900 pg/mL. Between 200 and 300 is a grey zone where symptoms and a homocysteine test help decide whether to treat.

Tingling or numbness in hands and feet, tiredness, a sore tongue, poor balance, and memory or concentration problems. Nerve symptoms can appear before the blood count changes.

Usually yes. Plant foods contain almost none, so a regular supplement or fortified food is expected rather than a sign of anything wrong.

Haath pairon mein jhunjhunahat, thakan, jeebh mein jalan aur yaaddasht ki samasya. Shakahari logon mein yeh bahut aam hai, aur jald ilaaj zaroori hai.

Please note. This page explains what a number means against reference ranges for your age and gender. It does not diagnose anything, cannot see the rest of your report, and is no substitute for a doctor. If your lab’s printed range differs, your lab’s range applies.