Homocysteine (Serum) Concentration

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have a history of heart disease, stroke, or other vascular conditions. It could also be checked if you have symptoms like fatigue, numbness, or tingling in your hands or feet. Additionally, it may be part of routine screening for people with certain genetic conditions or those taking folic acid, vitamin B6, or vitamin B12 supplements.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test, but always follow your provider’s instructions. Bring any medications you’re currently taking, as they can affect results.

What to Expect During the Test

A small needle will be inserted into your arm or hand to draw blood. You may feel a slight pinch, but it usually takes only a few seconds. The blood sample is then sent to a lab for analysis.

What the Results Mean

Results are typically reported as a concentration value (e.g., micromoles per liter). High levels may indicate an increased risk for heart disease, nerve damage, or other health issues. Low levels might suggest deficiencies in certain vitamins (like folate, vitamin B6, or B12). Always discuss your results with your healthcare provider.