Warfarin Adverse Event Reduction For Adults Receiving Genetic Testing at Therapy INitiation (WARFARIN)

Inclusion Criteria:

1. Men and women at least 65 years old

2. Beginning warfarin (0 - 3 doses of warfarin taken at the time of enrollment) for a
variety of diseases or conditions that require at least 30 days oral anticoagulation
with target INR ≥ 2.0

Exclusion Criteria:

1. Unable to complete the study materials (questionnaires) with or without assistance
(for example, those with dementia)

2. A previous genetically determined warfarin dose

3. The treating physician does not agree to use the recommended warfarin dose or feels
that the patient should not be enrolled in the study