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Home-anticoagulation testing: accuracy of patient-reported values
Jacquelyn Quin1, Laura Q Rogers, Stephen Markwell
1Department of Surgery, Southern Illinois University School of Medicine, Springfield, Illinois 62794-9638, USA. jquin@siumed.edu
The Journal of Surgical Research
|April 3, 2007
Summary
Patient-reported International Normalized Ratio (INR) values from home anticoagulation testing (HAT) are highly accurate. The time within therapeutic range (PTWTR) using HAT closely matches anticoagulation clinic service (ACS) results, though patient compliance requires consideration.
Area of Science:
- Cardiology
- Pharmacology
- Patient Monitoring
Background:
- Limited research exists on the accuracy of patient-reported International Normalized Ratio (INR) values from home anticoagulation testing (HAT).
- Assessing the accuracy of patient-reported INR values is crucial for effective anticoagulation management.
- Comparing home testing data with traditional anticoagulation clinic service (ACS) data is needed.
Purpose of the Study:
- To evaluate the accuracy of patient-reported INR values obtained through HAT.
- To compare the percentage of time within therapeutic range (PTWTR) using HAT data versus ACS data.
Main Methods:
- A prospective, year-long crossover study involved 49 anticoagulated patients comparing HAT and ACS testing.
- Patients performed HAT for 6 months, reporting INR values telephonically.
- Device data and telephone logs were compared for accuracy; PTWTR was calculated for both HAT and ACS.
Main Results:
- 32 out of 49 patients completed the study.
- Mean reporting accuracy was 94.0% (median 100%), with three patients showing low accuracy.
- No significant difference was found in PTWTR between HAT (59.8%) and ACS (59.5%) data.
Conclusions:
- Patient-reported INR values via HAT demonstrate high accuracy.
- PTWTR derived from HAT is comparable to that from ACS.
- The potential for noncompliance in a subset of patients suggests considering periodic verification of patient-reported INR values.
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