What happens during an LDH test?A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.LDH is sometimes measured in other body fluids, including fluids in the spinal cord, lungs, or abdomen. If you are having one of these tests, your health care provider will give more information about the procedure.
