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Ldh Isoenzymes

Ldh Isoenzymes

Alternate Names

  • lactic dehydrogenase
  • total LDH
  • total lactic dehydrogenase
  • total lactate dehydrogenase
  • lactate dehydrogenase


This blood test measures the blood levels of the fractions (or isoenzymes) of the enzyme lactic dehydrogenase, also called LDH.

Who is a candidate for the test?

A doctor may order this test if he or she suspects tissue damage in the body.

How is the test performed?

In order to measure the amounts of LDH isoenzymes in the blood, a blood sample is taken from a vein on the forearm or hand. First, the skin over the vein is cleaned with an antiseptic. Next, a rubber tube is tied around the upper arm to enlarge the veins in the lower arm. A fine 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 to be tested in the lab. After the needle is withdrawn, the puncture site is covered for a short time to prevent bleeding.

What is involved in preparation for the test?

No preparation is normally required for this test.

What do the test results mean?

Normal levels of LDH are between 115 and 225 IU/L (international units per liter). Abnormally high levels of LDH may indicate:
  • heart attack, or heart muscle damage from a blockage in a heart artery
  • hemolytic anemia, a condition in which red blood cells are destroyed
  • infectious mononucleosis, an infection caused by a virus called the Epstein-Barr virus
  • intestinal damage
  • liver disease, such as cirrhosis
  • low blood pressure
  • lung damage
  • muscle injury
  • new abnormal tissue formation
  • pancreatitis, or inflammation of the pancreas
  • stroke, or damage to the brain caused by a lack of oxygen

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