Accuracy and precision of the CoaguChek S versus laboratory INRs in a clinic.

Background: The CoaguChek S is the next-generation coagulation monitor for measuring the international normalized ratio (INR) that replaces the CoaguChek device. Studies are lacking comparing the CoaguChek S with local laboratory INR assessment to ensure its accuracy and precision for monitoring patients on anticoagulation.

Objective: To evaluate accuracy, precision, and technical ease-of-use of the CoaguChek S compared with laboratory measurements.