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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.
Propyl-paraben is a synthetic preservative used in cosmetics, personal care products, pharmaceuticals, and packaged foods since the 1920s.
