The test uses a smartphone’s built-in vibration motor and camera to track the movement of a copper particle in a drop of blood.
The developers will present the results of a study that outlines their work on Wednesday during a science poster session at AACC 2022.
The group tested blood from 140 unnamed patients at the University of Washington Medical Center in addition to blood from 79 patients with known blood clotting problems.
In both groups, the new test produced similar results to PT/INR lab tests.
As a next step, Michaelsen plans to research whether patients can use the new test on their own at home. She sees it as helpful for people in rural areas to minimize long and increasingly expensive trips to doctors.
The goal is to develop a test that will allow more people to spend more time in the desirable PT/INR range, which would mean they are not at risk of clots or uncontrolled bleeding.
People taking the blood-thinning drug warfarin to prevent blood clots that can lead to heart attacks should have frequent blood tests to make sure the drug is working. Currently, these tests are performed in a clinical laboratory or using expensive home testing systems; this involves a particular measurement of the time it takes for a clot to form, PT, and the calculation of the INR so that doctors can compare results between different tests or laboratories.
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