lactate_dehydrogenase_ldh_test
Reviewed
This test measures the level of lactate dehydrogenase (LDH), an enzyme found in many body tissues. When cells are damaged by disease or injury, LDH is released into the blood or other fluids. The test helps detect tissue damage but cannot identify the exact location or cause; it is usually done with other tests.
Preparation and collection
No special preparation is needed for a blood sample. For other fluid samples, follow your provider's instructions.
Understanding this test
Use the reference interval and units printed by the laboratory that performed the test. A result outside that interval is not a diagnosis by itself, and a result inside it does not rule out every condition. Your symptoms, history, medicines, timing, and related tests can change what the result means.
- An LDH test alone cannot show what is damaging your tissues or where the damage is located.
- High levels can be caused by intense exercise, certain medicines, or sample handling issues, not just disease.
- Low levels are uncommon and usually not a health problem.
What to do next
If your results are higher than normal, your provider may order an LDH isoenzyme test to help find out which tissues are damaged. Always discuss your results with your healthcare provider.
Evidence source
U.S. National Library of Medicine: lactate_dehydrogenase_ldh_test