The QStat Cartridge is a multi-channel cartridge used with the Quantra Hemostasis Analyzer (Quantra) to assess a patient’s hemostatic system. The Quantra is based on Sonic Estimation of Elasticity via Resonance (SEER) Sonorheometry, a patented technology that uses ultrasound to measure the shear modulus of whole blood during coagulation and clot lysis as a function of time.