Key result
Point-of-care instruments for monitoring warfarin exhibited a positive bias of 0.24 to 0.35 INR units compared to central laboratory instruments, with bias increasing at higher INR values.
Why the study?
Do point-of-care (POC) instruments provide accurate INR measurements compared to central laboratory instrumentation in patients treated with warfarin?
Population
Patients treated with warfarin requiring oral anticoagulation monitoring
Comparison
Two point-of-care instruments employing… vs Central laboratory coagulation analyzer…
Design
Cross-sectional
Authors
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High POC INR values may warrant lab confirmation before warfarin adjustment; hypothesis-generating for outcome impact and device calibration.
Observational
Do point-of-care (POC) instruments provide accurate INR measurements compared to central laboratory instrumentation in patients treated with warfarin?
Effect estimate: positive bias of 0.24 - 0.35 INR units
Point-of-care INR monitors exhibit a positive bias compared to central laboratory testing, particularly at high INR values, suggesting high POC results should be confirmed with central lab testing before adjusting warfarin doses.
Dorfman et al. (2005) conducted an observational in patients treated with warfarin. Point-of-care (POC) instruments vs. central laboratory instrument was evaluated on accuracy of INR measurement (positive bias of 0.24 - 0.35 INR units). Point-of-care instruments for monitoring warfarin exhibited a positive bias of 0.24 to 0.35 INR units compared to central laboratory instruments, with bias increasing at higher INR values.
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