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Homocysteine Test: normal range & what your result means
Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed
Medically reviewedHomocysteine is an amino acid in the blood. High levels are common in India, often due to low vitamin B12 or folate, and are linked with a higher risk of heart disease, stroke and clots.
About the test
Why the homocysteine test is done
- Suspected vitamin B12 or folate deficiency
- Heart disease, stroke or clots at a young age, or a strong family history
- Part of some health check packages
Reference range
Typical adult range
| Measure | Typical adult range |
|---|---|
| Typical adult | About 5–15 µmol/L |
| Moderately high | 15–30 µmol/L |
| High | Above 30 µmol/L |
Typical adult range; labs differ — use the range on your report. Ranges also vary with age, sex, pregnancy and the method used. Your doctor interprets the result alongside your symptoms and history.
Results
What a HIGH result can mean
- Low vitamin B12 or folate — common in vegetarian diets
- Kidney disease or an underactive thyroid
- Smoking, heavy alcohol use, some medicines
- Rare inherited conditions
Results
What a LOW result can mean
- Low levels are generally not a concern
Preparation
Before the test
- Fasting for 8–12 hours is often advised
- Tell the lab about vitamin supplements
Red flags
When to get urgent help
- Chest pain, sudden weakness, face drooping or slurred speech — call your local emergency number (108/112 in India)
- A painful, swollen calf (possible clot)
Explore more
Related pages
References
Sources & further reading
Frequently asked questions
What causes high homocysteine?
Most often low vitamin B12 or folate. Kidney disease, smoking, thyroid problems and some medicines also raise it.
Is high homocysteine dangerous?
It is linked with a higher risk of heart disease, stroke and clots. Correcting vitamin deficiencies lowers the level; your doctor will look at your overall risk.
How can I lower my homocysteine?
Treating B12 or folate deficiency usually brings it down. Foods like dairy, eggs and leafy greens help. Ask your doctor before starting supplements.