Assessing the Ability of Warfarin Treated Patients to Predict Their INR

Completed

Conditions studied: Atrial Fibrillation

In brief

ASSESSING THE ABILITY OF WARFARIN TREATED PATIENTS TO PREDICT THEIR INR Kathleen McNamara, James Hoehns, Matthew Witry The international normalized ratio (INR) is the accepted lab test used to measure the intensity of warfarin effect. The conventional wisdom is that patients receiving warfarin are unable to correctly determine, in the absence of an INR result, whether or not they are therapeutic at any given time. Some warfarin treated patients express that they have insight into what their INR result will be. Various patient related factors may contribute to these opinions. Our objective is to assess how accurately patients can guess their INR result before it is obtained and to describe factors which inform their opinion of what their INR will be.

Key facts

Study ID

NCT02764112

Run by

Northeast Iowa Medical Education Foundation

People needed

87

Starts

2015-10-01

Expected to finish

2016-07-01

Last updated by the study team

2019-06-27

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Age ≥18 years
• Warfarin use ≥60 days
• INR goal of 2.0-3.0 or 2.5-3.5
• Expected warfarin use >6 months
• English speaking

You may not qualify if…

• Self INR-testing
• Home INR draws
• Dementia
• Residence of a long-term care facility

Where it is running

• Northeast Iowa Family Practice — Waterloo, Iowa, United States

Full record on ClinicalTrials.gov

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