Triglycerides level test measures the amount of triglycerides in the blood. Triglycerides are a type of fat (lipid) found in the blood. When you eat, the body converts any calories it doesn't need to use right away into triglycerides, which are stored in fat cells. High levels of triglycerides can contribute to the hardening of arteries or thickening of artery walls (atherosclerosis), which increases the risk of stroke, heart attack, and heart disease. Additionally, high triglyceride levels can be a sign of other conditions, like type 2 diabetes or thyroid diseases. This test is part of evaluating overall heart health, especially in assessing the risk of cardiovascular disease.