Study to Test the Accuracy of a Prototype Handheld PT/INR Device

Correlation of Feasibility Batches Using Warfarinised Blood

The purpose of this study is to measure prothrombin time (PT) on an experimental device and a commercially available device on persons receiving coumadin (warfarin)treatment.

This study will require participants to have up to 2 finger-punctures taken and sample tested on a strip and meter system for both the experimental and commercially available devices.

Inclusion Criteria:

• Currently taking coumadin (warfarin)
• Aged 18 years or older
• Able and willing to provide informed consent
• Can understand (read and write) English

Exclusion Criteria:

• None