Journal of Thrombosis and Thrombolysis

, Volume 30, Issue 3, pp 263–275 | Cite as

An evaluation of patient self-testing competency of prothrombin time for managing anticoagulation: pre-randomization results of VA Cooperative Study #481–The Home INR Study (THINRS)

  • Rowena J. Dolor
  • R. Lynne Ruybalid
  • Lauren Uyeda
  • Robert G. Edson
  • Ciaran Phibbs
  • Julia E. Vertrees
  • Mei-Chiung Shih
  • Alan K. Jacobson
  • David B. Matchar
  • for the THINRS Site Investigators


Prior studies suggest patient self-testing (PST) of prothrombin time (PT) can improve the quality of anticoagulation (AC) and reduce complications (e.g., bleeding and thromboembolic events). “The Home INR Study” (THINRS) compared AC management with frequent PST using a home monitoring device to high-quality AC management (HQACM) with clinic-based monitoring on major health outcomes. A key clinical and policy question is whether and which patients can successfully use such devices. We report the results of Part 1 of THINRS in which patients and caregivers were evaluated for their ability to perform PST. Study-eligible patients (n = 3643) were trained to use the home monitoring device and evaluated after 2–4 weeks for PST competency. Information about demographics, medical history, warfarin use, medications, plus measures of numeracy, literacy, cognition, dexterity, and satisfaction with AC were collected. Approximately 80% (2931 of 3643) of patients trained on PST demonstrated competency; of these, 8% (238) required caregiver assistance. Testers who were not competent to perform PST had higher numbers of practice attempts, higher cuvette wastage, and were less able to perform a fingerstick or obtain blood for the cuvette in a timely fashion. Factors associated with failure to pass PST training included increased age, previous stroke history, poor cognition, and poor manual dexterity. A majority of patients were able to perform PST. Successful home monitoring of PT with a PST device required adequate levels of cognition and manual dexterity. Training a caregiver modestly increased the proportion of patients who can perform PST.


Anticoagulation Patient self-testing Atrial fibrillation Mechanical heart valve 


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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Rowena J. Dolor
    • 1
    • 2
    • 11
  • R. Lynne Ruybalid
    • 3
  • Lauren Uyeda
    • 4
  • Robert G. Edson
    • 4
  • Ciaran Phibbs
    • 5
    • 6
  • Julia E. Vertrees
    • 7
  • Mei-Chiung Shih
    • 4
    • 8
  • Alan K. Jacobson
    • 3
    • 9
  • David B. Matchar
    • 1
    • 2
    • 10
  • for the THINRS Site Investigators
  1. 1.Center for Health Services Research in Primary CareVA Medical CenterDurhamUSA
  2. 2.Division of General Internal Medicine, Department of Medicine, and Center for Clinical Health Policy ResearchDuke University Medical CenterDurhamUSA
  3. 3.Research and Development Service (151)Jerry L. Pettis VA Medical CenterLoma LindaUSA
  4. 4.Cooperative Studies Program Coordinating Center (151K)VA Palo Alto Health Care SystemPalo AltoUSA
  5. 5.Health Economics Resource CenterVA Palo Alto Health Care SystemPalo AltoUSA
  6. 6.Department of Pediatrics and Center for Primary Care and Outcomes ResearchStanford University School of MedicineStanfordUSA
  7. 7.VA Cooperative Studies Program Clinical Research Pharmacy Coordinating CenterAlbuquerqueUSA
  8. 8.Division of Biostatistics, Department of Health Research and PolicyStanford UniversityStanfordUSA
  9. 9.Department of Internal MedicineLoma Linda UniversityLoma LindaUSA
  10. 10.Program in Health Services and Systems ResearchDuke-National University of Singapore Graduate Medical SchoolSingaporeSingapore
  11. 11.Duke Clinical Research InstituteDurhamUSA

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