Homocysteine
homocysteine test · homocysteine level · plasma homocysteine
This is a blood test from a vein. Homocysteine is a substance whose level is linked to B vitamins and blood vessel health.
For blood vessel disease and blood clots, when planning a pregnancy, or for low vitamin B12 and folate.
⏱ Duration: the blood draw takes 3 to 5 minutes; results usually come in 1 to 3 days
Be sure to tell your doctor
How to prepare
- Food. Usually strictly fasting, 8 to 12 hours without food. Water is fine.
- The day before. No alcohol, no fatty food or meat, and no hard workouts. Do not smoke in the morning.
- Medicines. Do not stop them on your own. Ask your doctor if you should pause vitamins before the test.
What to bring
- Your test request form
- Your ID
How it goes
- You sit down and rest your arm on the armrest
- A band is tightened above your elbow, and the skin is wiped
- Blood is drawn into a tube
- The needle comes out, and a cotton pad is pressed on
What you'll feel
- A quick prick, like a pinch
Afterwards
- Press the cotton pad for 3 to 5 minutes
- Results usually come in 1 to 3 days
- Your doctor will explain the results
Common questions
What if my homocysteine is high?
Often the cause is low B vitamins. Your doctor decides what to take and at what dose.
Why test homocysteine when planning a pregnancy?
It helps show if you have enough folate. Your doctor decides about vitamins.