Steps-

1. Patient will sit in a chair or lie down.
2. Technician will ask patient to make a fist with his hand.
3. Then they’ll tie a band, called a tourniquet, around the upper arm. (This makes the veins pop out a little more, which will make it easier to insert the needle in the right place.)
4. Patient may feel a pinch or sting when the needle goes into the arm.
5. The needle is attached to a small tube that lets the blood flow into a test tube or bag.
6. The process usually takes just a few minutes.