As part of your regular checkup, it is likely that the doctor will order bloodwork that among other things will measure your levels of total cholesterol and also High Density Lipoproteins (HDL). Should the numbers show outside of the normal range, your doctor may ask for a fasting cholesterol test. For this, you won't eat or drink other than water for twelve hours prior to the test. This test will show your Low Density Lipoprotein (LDL) and triglyceride levels, in addition to the total choleste.