Thrombin Time (TT) reagent is designed to detect an impaired fibrin polymerisation process and presence of heparin. It can be used as a screening test for functional abnormalities of fibrinogen, and to detect the presence of heparin and/or thrombin inhibitors in citrated plasma. The assay measures the ability of exogenous thrombin to convert fibrinogen to fibrin, followed by fibrin polymerisation and clot detection. TT is a common clotting test used to detect fibrinogen abnormalities, and the presence of heparin and other thrombin inhibitors in human citrated plasma. Nordic Biomarker’s Thrombin Time has been designed for easy quality control and should only be used with normal controls.