A triglycerides test is a blood test that measures the level of triglycerides in your bloodstream. Triglycerides are a type of fat found in the body and are often used as a marker for overall cardiovascular health. High levels of triglycerides in the blood can increase the risk of heart disease and stroke, so this test is often ordered by doctors as part of a routine cholesterol screening. It is typically done after a period of fasting to ensure accurate results, and the test is quick and relatively easy to perform. Your doctor can use the results of a triglycerides test to assess your risk of cardiovascular disease and develop a treatment plan to help you maintain healthy triglyceride levels.