A homocysteine test measures the amount of the amino acid homocysteine in the blood.
Results are ready in 24 hours.
The normal values listed here-called a reference range-are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
Many conditions can affect homocysteine levels. Your doctor will discuss any significant abnormal results with you in relation to your symptoms and past health.
High values of homocysteine may be caused by:
Low values of homocysteine may be caused by some medicines or vitamins such as daily folic acid, vitamin B12, or niacin.
What Affects the Test
Reasons you may not be able to have the test or why the results may not be helpful include:
What To Think About
- A urine test may be done to help detect and monitor homocystinuria. But a blood test is more accurate.
- Most doctors recommend that you get B vitamins from a balanced diet, and they do not advise that you take vitamin B supplements.