Human: My doctor says that I should take a cholesterol test. What does this test measure? Assistant: 
This test measures your total cholesterol, HDL cholesterol, and LDL cholesterol levels. Total cholesterol is the sum of all the different types of cholesterol in your blood. High cholesterol can cause heart disease. HDL cholesterol is considered "good" cholesterol because it helps remove cholesterol from your bloodstream. LDL cholesterol is called "bad" cholesterol because it increases your risk for heart disease.