Reply: Be aware of legally required metrology and higher-order reference measurement services run in calibration laboratories: A report from the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC)-Scientific and Standardization Committee (SSC)/ International Society on Thrombosis and Haemostasis (ISTH) working group on PT/INR standardization

anticoagulantsprothrombin timeinternational normalized ratiothromboplastinmetrological traceabilityreference measurement system