Vitamin B12 Test
- Category
- Vitamins
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 2 days
- Fasting
- No Fasting
- Age
- All Ages
What Is This Test?
Measures vitamin B12 (cobalamin), needed for healthy nerves, red blood cell production and DNA.
Why this test is performed?
Detects B12 deficiency, which can cause anaemia, tiredness, tingling/numbness, memory problems and mouth ulcers. Very common in vegetarians, older adults and people on metformin or antacids.
Who should take this test?
Tingling or numbness, fatigue, memory problems, vegetarians, people over 50 or taking metformin/antacids.
Test Preparation
No fasting needed.
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
- Report time: In 2 days
- No fasting
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Frequently asked questions
Vegetarians and vegans, people over 50, those taking metformin or acid-reducing medicines, and people with gut absorption problems.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood sample taken from a vein in your arm.
Usually within 12–36 hours after the sample reaches the lab. You will receive the report online.
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