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LDH (Lactate Dehydrogenase) Isoenzymes

LDH (Lactate Dehydrogenase) Isoenzymes

Lactate dehydrogenase (LDH) is an enzyme that is found in nearly all living cells and is involved in the conversion of lactate to pyruvate, an essential step in producing energy for the cell. LDH exists in the form of five different isoenzymes, which are made up of different combinations of protein subunits. These isoenzymes are labeled LDH-1 through LDH-5 and are found in different concentrations in various tissues throughout the body.

When cells are damaged or destroyed, LDH is released into the bloodstream, and its levels can increase. By evaluating the specific isoenzymes of LDH (LDH-1 through LDH-5), doctors can sometimes determine the location and extent of tissue damage, as different isoenzymes are more prominent in certain tissues.


  • Test NameLDH (Lactate Dehydrogenase) Isoenzymes
  • Sample TypeBlood
  • Preparations RequiredNo special preparation is needed for this test.
  • Report Time3 Days

Why would a doctor order an LDH isoenzymes test?

A doctor may order this test to help determine the cause of elevated LDH levels in the blood, to help diagnose a specific disease or condition, or to monitor the progression of a disease affecting specific tissues or organs.

What do elevated LDH-1 levels indicate?

Elevated levels of LDH-1 often suggest damage to the heart muscle, such as in the case of a heart attack. LDH-1 is also found in red blood cells, and high levels may indicate hemolytic anemia.

Home Sample Collection Process

1
Book your convenient slot
Book your convenient slot
2
Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
3
Reporting of the sample at lab
Reporting of the sample at lab
4
Download Reports
Download Reports
Frequently Asked Questions

Total LDH measures the total amount of LDH in the blood, while LDH isoenzymes test separates out the different forms (LDH-1 through LDH-5) to help determine which tissues may be damaged or diseased.

LDH-2 is primarily found in white blood cells and the lining of the lungs. Elevated levels may indicate an infection or lung disease.

LDH-3 is mainly present in the lungs. Elevated levels of LDH-3 might indicate lung injury or disease.

LDH-4 is predominantly found in the kidneys, placenta, and pancreas. Elevated levels may indicate damage or disease in these organs.

LDH-5 is most concentrated in the liver and skeletal muscle. Elevated levels can be indicative of liver disease or muscle injury.

A blood sample is drawn from a vein in the arm. This sample is then analyzed in a laboratory to measure the levels of the different LDH isoenzymes.

The risks are minimal and are mainly associated with the blood draw, such as slight pain or bruising at the site of the needle insertion.

Yes, certain medications can affect LDH levels. It's important to inform your doctor of any medications you are taking.

Your doctor will use the results to help diagnose or rule out specific diseases or conditions, and to monitor the health of certain organs or tissues.

Factors that can affect LDH isoenzyme levels include tissue injury, certain medications, and strenuous exercise.

If your LDH isoenzymes levels are abnormal, it is important to follow up with your doctor for further evaluation and guidance on the necessary steps or treatment.

Not necessarily, but high levels may be indicative of serious underlying conditions. The importance is in understanding and treating the cause of the elevated levels.

The LDH isoenzymes test is not usually done as part of a routine check-up but may be ordered under specific circumstances when a doctor is trying to diagnose or monitor a certain condition.

Understanding LDH isoenzymes and what they indicate about your health is important. This test can provide valuable information about the state of different organs and tissues in your body, helping your doctor to diagnose or monitor various conditions. As with any medical test, it’s essential to communicate openly with your doctor and ask any questions you may have about the test, its purpose, and your results.

LDH (Lactate Dehyderogenase) Isoenzymes
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