MilliporeSigma introduces a testosterone calibrator kit for in vitro diagnostic (IVD) use that allows users to calibrate assays and verify calibrations. The diagnostic range of the new kit encompasses both male and female testosterone clinical reference ranges, enabling ample analytical sensitivity for accurate testing using new mass spec-based methods. The kit delivers accurate and consistent test results for reliable clinical diagnosis and monitoring. It includes a set of 10 levels of testosterone serum concentration standards ranging from 2 ng/dL to 2,000 ng/dL, along with a blank and internal standard.