Homocysteine, Serum

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms of vascular issues (such as leg pain, numbness, or fatigue), a history of heart disease, or if you have a family history of conditions like heart disease, stroke, or certain genetic disorders. It may also be used to monitor treatment for conditions affecting blood vessels or to check for inherited metabolic disorders.

What Does the Test Measure?

Homocysteine is a sulfur-containing amino acid that your body produces naturally. High levels can damage blood vessels over time, increasing the risk of heart disease, stroke, or blood clots. This test helps determine if your levels are within a healthy range or if they may pose risks.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. You may feel a small pinch when the needle is inserted, but the procedure is quick and usually not painful. The blood is then sent to a lab for analysis using an immunoassay method to measure homocysteine concentration.

What Do Results Mean?

Results are typically reported as a concentration value (e.g., micromoles per liter). While reference ranges can vary slightly by lab, high levels may suggest increased risk for vascular problems, while low levels are less commonly associated with clinical concern unless due to specific medications or conditions.