Accuracy and Precision of the CoaguChek S versus Laboratory INRs in a Clinic

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Why the study?

Does the CoaguChek S device accurately and precisely measure INR compared to laboratory assessment in patients on anticoagulation?

Population

101 patients on anticoagulation (accuracy cohort) and 31 patients (precision cohort)

Comparison

CoaguChek S device for measuring INR vs Local laboratory INR assessment

Design

Cross-sectional

Authors

Discussion

Discrepancies may prompt inappropriate dosing changes; leaves open CoaguChek S reliability pending prospective validation.

Does the CoaguChek S device accurately and precisely measure INR compared to laboratory assessment in patients on anticoagulation?

Population

101 patients on anticoagulation (accuracy cohort) and 31 patients (precision cohort)

Intervention

CoaguChek S device for measuring INR

Comparator

Local laboratory INR assessment

Outcome

Accuracy (evaluated by orthogonal regression, Bland-Altman plot, and clinical applicability) and precision (mean difference +/- SD, CV, CR)surrogate

The CoaguChek S is an accurate and precise alternative to laboratory INR assessment for values <4.0, with a low error rate of 1.8%.

Havrda et al. (2002) studied this question.

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