Blood.

Inform your doctor if you are on any medications or have any underlying medical conditions or allergies before undergoing this test. For this test, fasting for at least 8 to 12 hours is recommended.

2 Hours.

Lipids are a group of fats and fat-like substances that are important constituents of cells and sources of energy. Cholesterol and triglycerides are the two important lipids. Cholesterol and triglycerides are transported are circulated into the blood through lipoprotein particles. High-density lipoproteins (HDL) are considered as good cholesterol and low-density lipoproteins (LDL) is considered as bad cholesterol. High-density cholesterol carries cholesterol to the liver from various parts of your body. LDL gets attached to the walls of arteries and clogs them. This leads to a condition called atherosclerosis.