2-Hydroxyethyl Mercapturic Acid Test

2-Hydroxyethyl mercapturic acid is a urinary metabolite formed after exposure to ethylene oxide or vinyl chloride, both widely used industrial chemicals. Ethylene oxide is used to sterilize medical equipment and produce antifreeze and plastics, while vinyl chloride is used to manufacture polyvinyl chloride found in pipes, packaging, and construction materials. Exposure occurs mainly through inhalation, particularly in occupational settings and through tobacco smoke.

Ethylene oxide and vinyl chloride are both recognized human carcinogens. Long term exposure is associated with increased risk of leukemia, non-Hodgkin lymphoma, and liver cancer. Vinyl chloride in particular is linked to hepatotoxicity, meaning damage to liver cells, and vascular abnormalities.

Metabolically, these chemicals are processed in the liver by cytochrome P450 enzymes and glutathione conjugation pathways. 2-Hydroxyethyl mercapturic acid represents the final excreted form of detoxification. Elevated levels indicate increased toxic burden and increased reliance on glutathione dependent defense systems.

That said, levels can be influenced by occupational exposure, smoking, and environmental contamination. Interpretation is strongest when contextualized with liver function markers and other volatile organic compound metabolites.