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admin · #3 (**permalink**) 12-20-2017, 11:25 AM

Preparation

Although liver function tests can be done without any special preparation, the results are more accurate when a person has been fasting. So your doctor may ask you not to eat or drink for 8 to 12 hours before having your blood taken.
Tell your doctor about any medications (including over-the-counter medicines or herbal supplements) you're taking because certain drugs might alter the test results.
It can help to wear a T-shirt or other short-sleeved top on the day of the test to make things faster and easier for the technician who will be drawing the blood.
The Procedure

A health professional will usually draw the blood from a vein in your arm — most often on the inside of the elbow, but sometimes on the back of the hand. The technician cleans the skin surface with antiseptic and ties an elastic band (tourniquet) around the upper arm so the veins swell with blood and are easy to see.
Next, it's time for the needle. It should feel like a quick pinprick. Occasionally, it can be hard to find a vein so a nurse, doctor, or technician may need to try more than once. That's not the norm, though — most people's veins are easy to find.
It's best to try to relax and stay still during the procedure since tensing muscles can make it harder and more painful to draw blood. And if you don't want to watch the needle being inserted or see the blood collecting, you don't have to. Look the other way and maybe relax by focusing on saying the alphabet backwards, doing some breathing exercises, thinking of a place that makes you happy, or listening to your favorite music.
The technician will draw the blood so it collects in a vial or syringe. Collecting blood will only take a few minutes. Once the technician has enough blood, he or she removes the needle and covers the area with cotton or a bandage to stop the bleeding. After the test, you may notice some bruising — that's normal and it should go away in a few days.
Don't be afraid to ask the technician if you have any questions about the blood draw.