This is the most accurate, single test for measuring your 'bad' cholesterol risk. The Apolipoprotein B (Apo B) test measures the main protein 'vehicle' for all bad cholesterol, including LDL. Instead of just estimating your bad cholesterol, this test gives a direct particle count—the total number of 'bad' carriers in your blood. This number is a more powerful and reliable predictor of plaque buildup and heart disease risk than a standard LDL test. This is the new gold standard. Get the definitive number you need to take control of your heart health.