Method: LC-MS/MS (Liquid Chromatography/Tandem Mass Spectrometry) with creatinine normalization by Jaffe Reaction (CLIA 17D0919496); not cleared or approved by the FDA. Results reported in µg/g creatinine. Not a stand-alone diagnosis; should be interpreted in clinical context.
A derived biomarker is a value that is calculated from other directly measured biomarkers rather than being measured directly in the lab.
Key benefits of N-Acetyl (Propyl) Cysteine (NAPR) testing
- 1-bromopropane solvent exposure tracking
- industrial degreaser and aerosol monitoring
What is N-Acetyl (Propyl) Cysteine (NAPR)?
NAPR is a urinary metabolite of 1-bromopropane (1-BP), a solvent used in aerosol sprays, dry cleaning, and industrial degreasing. Measured via LC-MS/MS with creatinine normalization.
Why is N-Acetyl (Propyl) Cysteine (NAPR) important?
1-bromopropane is listed as a possible human carcinogen (per NTP) that replaced earlier-banned solvents in some applications. Urinary NAPR may reveal occupational or consumer product exposures that would otherwise go undetected.
What insights will I get?
Your NAPR level may indicate exposure to 1-BP-containing aerosol products, dry-cleaned garments, or industrial materials. Elevated levels may prompt a review of occupational or household product exposures.





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