The blood is usually drawn from a vein in the forearm or the hand. First, the skin over the vein is cleaned with an antiseptic. Next, a strong rubber tube called a tourniquet is wrapped around the upper arm. This enlarges the veins in the lower arm by restricting blood flow through them. A very thin needle is gently inserted into a vein and the tourniquet is removed.
Blood flows from the vein through the needle and is collected in a syringe or vial.
The sample is sent to the lab to be analyzed. After the needle is withdrawn, the puncture site is covered for a short time to prevent bleeding. An HDL test is generally done after the individual has fasted overnight. By visiting this site, you agree to the terms and conditions of our Visitor Agreement .