The Triglycerides Serum test measures the main type of fat (lipid) that circulates in your blood. Your body converts any calories it doesn't need right away into triglycerides, which are stored in fat cells. High levels are a major risk factor for heart disease and stroke. This test, requiring a simple fasting blood draw, is a critical part of our comprehensive Lipid Profile. Knowing this number is essential. It's a direct, actionable measure of your metabolic health that you can control.