The combination of FAIMS and H-SRM provides excellent selectivity for the analysis of clenbuterol in human urine. Compared to the LC–SRM method, the use of LC–FAIMS–H-SRM reduced the chemical background and resulted in cleaner chromatograms and more reproducibly integrated chromatographic peaks. At the LLOQ, the clenbuterol assay in human urine shows the best accuracy and precision via LC–FAIMS–H-SRM.

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