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

Normal LDH levels range from 45 units per liter (U/L) to 90 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:	Robin Parks, MS	Last Updated: June 12, 2006
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine Douglas A. Stewart, MD - Medical Oncology
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