Homocysteine level is used as a screen for people who might be at higher risk for stroke or heart disease. You can read all about it here:<br> <br> <a href="http://www.labtestsonline.org/understanding/analytes/homocysteine/test.html" target="_blank">http://www.labtestsonline.org/understanding/analytes/homocysteine/test.html</a>