Health guide
Vitamin B12 deficiency: symptoms, tests, and correction
Vitamin B12 keeps your nerves healthy and helps make red blood cells. Your body cannot produce it; it comes almost entirely from animal foods, so vegetarians, vegans, and older adults are most at risk. Deficiency develops slowly over months to years, and the early signs (tiredness, low mood, pins and needles) are easy to blame on a busy life. It is common in India and, once found, usually simple to correct.
Reviewed by Dr. Vishal Singh, Lab Director
Common symptoms of low vitamin B12
- Persistent tiredness and weakness
- Tingling, pins and needles, or numbness in the hands or feet
- Low mood, poor concentration, or forgetfulness
- A sore, red tongue or mouth ulcers
- Pale skin or breathlessness on mild effort
- Unsteadiness or balance problems
Who is most at risk
Vegetarians and vegans, adults over 60, people on long-term acidity medicines or metformin, and anyone with a gut condition that affects absorption are most likely to run low. Pregnancy and breastfeeding also raise the need. If you fall into one of these groups and feel persistently tired, a simple blood test settles it.
Which test, and the normal range
A serum Vitamin B12 test measures the level directly. Many labs flag a value below about 200 pg/mL as low and 200-300 pg/mL as borderline, though ranges vary by lab. B12 is often checked alongside a Complete Blood Count, because a deficiency can make red blood cells larger than normal (a raised MCV), which is an early clue. Always interpret your result with a doctor, who may add folate or other tests.
This guide is for general information and is not a diagnosis. Always discuss your symptoms and results with a doctor. LabONE includes a free doctor consultation with every report.
Tests that help
Recommended panel
EnergyShield
7 parameters in one panel
Frequently asked questions
What is the normal range for vitamin B12?
Most labs consider roughly 200-900 pg/mL normal, with values below about 200 pg/mL low and 200-300 borderline. Ranges differ between labs, so read your result against the range printed on your report and discuss it with a doctor.
Can vegetarians get enough vitamin B12?
It is harder, because B12 comes mainly from animal foods. Dairy and fortified foods help, but many vegetarians and vegans still fall short and benefit from testing and, if needed, a supplement advised by their doctor.
Do I need to fast for a B12 test?
No. A vitamin B12 test does not need fasting and can be given at any time of day.
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