LDH Release

LDH release refers to the leakage of lactate dehydrogenase (LDH), an enzyme normally kept inside cells, into surrounding fluid or blood when cells are injured or dying. In asbestos research, it is a standard measure of how toxic asbestos fibers are to lung and mesothelial cells. Clinically, elevated LDH in pleural fluid or blood signals active tissue damage or tumor activity.

Origin

Lactate dehydrogenase was first characterized in the 1940s, and the use of LDH leakage as a marker of cell membrane injury became a standard laboratory technique in the 1960s and 1970s. It was adopted in asbestos toxicology research to quantify how different fiber types damage cells in culture.

Significance in Asbestos Context

For patients, LDH appears in two places that may matter to your case. First, in your medical records: pleural fluid drawn during a thoracentesis is routinely tested for LDH, and high levels help distinguish an exudative (inflammatory or malignant) effusion from a benign one, a key step in diagnosing mesothelioma or asbestos-related pleural disease. Serum LDH may also be tracked during treatment as a rough marker of tumor activity. Second, in the scientific evidence supporting your claim: experts often cite laboratory studies showing that amphibole and chrysotile fibers cause LDH release from lung and mesothelial cells, which is part of how researchers demonstrate that asbestos is directly cytotoxic, supporting the biological plausibility of disease causation.

Example Sentence

The pulmonologist explained that the elevated LDH in the pleural fluid, combined with the imaging findings, was one of the reasons she ordered a pleural biopsy to rule out mesothelioma.

Related Terms

Thoracentesis, Pleural Effusion, Light's Criteria, Cytotoxicity, Mesothelial Cells, Biomarker

Notes

• Ask your doctor for copies of any pleural fluid analysis reports; LDH values and the fluid-to-serum LDH ratio are part of Light's criteria and can be important diagnostic evidence.
• If serum LDH is being monitored during treatment, ask whether it is being used as a tumor activity marker and how your trend compares to baseline.
• Preserve all laboratory reports (pleural fluid chemistry, serum chemistry panels, and pathology reports) as these document the biological evidence of disease that supports a claim.
• LDH is not specific to mesothelioma; it rises with many causes of cell injury, so it is interpreted alongside imaging, cytology, and biopsy results.