The Abbott TDx FLx® Immunology Analyzer continues be one of the best options in the dynamic field of therapeutic drug monitoring. The Abbott analyzer is designed to perform tests in three modes: random access, batch, and unit dose, and performs 1 to 8 different assays with up to 20 samples which can be done on a single carousel run. Assay testing is conducted in batch mode operation, enabled by the TDx FLx® Batch-Pack Adapter which is a platform that holds the batch reagent pack. Operations on TDx FLx® analyzer are carried out using fluorescence polarization technology. The TDx FLx® system follows a competitive binding immunoassay methodology, and prints out calculations of drug or hormone concentrations (in unknown samples) in reportable units. Calculations are done using the stored calibration curve. Return Policy Items are sold as-is with no returns or refunds available unless explicitly stated.