Lactic acid dehydrogenase (LDH)

Exam Overview

Lactic acid dehydrogenase (LDH) is an enzyme that helps produce energy. It is present in almost all of the tissues in the body and becomes elevated in response to cell damage. LDH levels are measured from a sample of blood taken from a vein.

Why It Is Done

LDH levels help diagnose heart attack, lung disease, lymphoma, anemia, and liver disease. They also help determine how well chemotherapy is working during treatment for lymphoma.

Results

Lactic acid dehydrogenase (LDH) is an enzyme that helps produce energy. Results may vary widely from lab to lab.

Normal LDH levels range from 100 units per liter (U/L) to 190 U/L.

What To Think About

Many diseases can cause elevations in LDH levels. Other tests are usually needed to confirm a diagnosis.

If heart attack is suspected, the LDH levels will be rechecked at 24 and 48 hours to monitor for changes.

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Author:	Bets Davis, MFA	Last Updated: April 22, 2008
Medical Review:	Anne C. Poinier, MD - Internal Medicine Douglas A. Stewart, MD - Medical Oncology
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