Key result
Portable Coaguchek XS shows strong correlation with standard lab testing for INR measurement.
Why the study?
Regular INR control is required for warfarin dosage adjustment and therapeutic control, and portable monitoring systems may optimize patient management.
Does the portable Coaguchek XS system provide comparable INR measurements to standard laboratory methods in patients on warfarin?
Cross-Sectional (n=19)
No
Does the portable Coaguchek XS system provide comparable INR measurements to standard laboratory methods in patients on warfarin?
Effect estimate: r 0.978 (95% CI 0.961-0.988)
p-value: p=<0.0001
The portable Coaguchek XS system is a reliable alternative for INR monitoring in patients on warfarin, though values greater than 3.5 should be confirmed with conventional laboratory methods.
CONTEXT: Anticoagulation with warfarin is considered the appropriate treatment for venous thromboembolism and other thrombotic pathologies. Regular INR control is required for dosage adjustment and therapeutic control. Use of portable monitoring systems optimizes management of these patients. OBJECTIVE: To compare INR measurements taken using the portable Coaguchek XS system in capillary blood with the standard laboratory method using venous blood. METHOD: Fifty-two samples each of venous and capillary blood were collected from nineteen patients on warfarin, who had been admitted to the Hospital da Beneficência Portuguesa de São Paulo, and analyzed using the conventional method and the Coaguchek XS system, respectively. RESULTS: Spearman's correlation coefficient ® for the overall performance of the two methods was 0.978 (p<0.0001; 95%CI 0.961-0.988). The Kappa measure of agreement for all patients was 76.8% (p<0.001; IC: 95% 0.975-0.561). Mean INR according to the Coaguchek XS system underestimated the values provided by the conventional method by -0.01 INR points, with a standard error of 0.342. Results for INR values greater than 3.5 were satisfactory with a correlation coefficient of 0.71, but without statistical significance (p>0.714). CONCLUSIONS: The Coaguchek XS system can be used to monitor prothrombin time in patients on oral anticoagulants, provided INR values greater than 3.5 are confirmed using the conventional laboratory method.
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Araújo et al. (2014) conducted a cross-sectional in Patients on warfarin for venous thromboembolism and other thrombotic pathologies (n=19). Coaguchek XS system (capillary blood) vs. Standard laboratory method (venous blood) was evaluated on Overall performance correlation between the two methods (Spearman's correlation coefficient) (r 0.978, 95% CI 0.961-0.988, p=<0.0001). The portable Coaguchek XS system demonstrated high correlation with the standard laboratory method for INR determination (r=0.978; 95% CI 0.961-0.988; p<0.0001).
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