CoaguChek XS Test Strips, PT INR Testing, CLIA Waived, 48/boxCoaguChek XS Test Strips CoaguChek XS PT test strips are single use reagent strips used with the Roche CoaguChek XS portable coagulometer to measure a patients prothrombin time (PT) and INR (international normalized ratio). They are intended for monitoring anticoagulation therapy (e. g. warfarin) in adults (and trained patients) by giving a rapid PT INR value from a tiny capillary blood sample. Each package contains individually foil wrapped strips