The purpose of this study was to establish the correlation between biological and chemical assays for the quantification of rifapentine in human plasma. The bioassay was found to overestimate antibiotic plasma concentration when compared to the high-performance liquid chromatography (HPLC) assay for rifapentine (r = 0.9538, n = 220). This was because of the presence of varying amounts of the biologically active 25-O-desacetyl metabolite in the test samples. A better correlation (r = 0.9804, n = 220) was observed when the bioassay data were compared to combined parent-metabolite HPLC values. Such correlative data are necessary adjuncts in the establishment of antibiotic susceptibility test breakpoints.
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