Vitamin B12 (Cyanocobalamin)
Test code: BCM0611
- Sample
- Blood
- Preparation
- Fasting preferred
- Report
- Within 3 Hours
- Processed
- Mon to Sun, by 06:00 PM
About this test
The Vitamin B12 test measures the level of vitamin B12 (cobalamin) in your blood. B12 is needed to make healthy red blood cells and keep your nerves working properly. Low B12 can cause anemia, tiredness, tingling in the hands and feet, and memory problems.
Preparation & sample
Overnight fasting is preferred. You can drink plain water. Tell us if you take vitamin B12 tablets or injections, or high-dose biotin supplements, as these can affect the result.
What does this test measure?
It measures the total amount of vitamin B12 in your blood. Your body cannot make B12, so it must come from food (mainly milk, curd, eggs, fish and meat) or supplements.
When should you get this test?
- Tiredness, weakness, pale skin or breathlessness
- Tingling, numbness or burning in the hands and feet
- Memory problems, poor concentration or mood changes
- A sore, red tongue or mouth ulcers
- A CBC showing anemia with large red blood cells
- A vegetarian or vegan diet, older age, or stomach or bowel surgery
- Long-term use of medicines such as metformin (for diabetes) or acidity medicines
Understanding your results
- Low levels suggest B12 deficiency. Common causes include a diet low in animal foods, poor absorption from the gut, and some long-term medicines.
- Borderline levels may need more tests, such as homocysteine, to confirm a deficiency.
- High levels are usually due to supplements or injections and are rarely a concern on their own.
Your report shows the reference range used by the lab. Treat a deficiency only under a doctor's advice, as the right dose and form (tablets or injections) depend on the cause.
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