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TFV-DP in DBS in patients categorized by (a) UTRA results and (b) VL failure category (above or below 400 copies/mL). There were significantly lower TFV-DP concentrations in participants who were UTRA negative (p = .02), but the difference in TFV-DP between participants with VF versus suppression was not significant (p = .5). DBS, dried blood spots; TFV-DP, tenofovir diphosphate; UTRA, urine tenofovir rapid assay; VF, virologic failure; VL, viral load.
