Smartphone device used to diagnose HIV

A Device costing $34 (R390) that plugs into the audio jack of a smartphone was nearly as effective as far more costly diagnostic blood-testing equipment in identifying antibodies for HIV and syphilis in a pilot study in Africa, US researchers said yesterday.

The mobile lab device, known as a dongle, cost $34 to make, compared with more than $18 000 (R206 000) for the gold standard diagnostic equipment.

In a pilot study, the device performed all of the mechanical, optical and electronic functions of a lab-based blood test in 15 minutes, using only power drawn from the smartphone.

It was developed by a team led by Samuel Sia, an associate professor at the Department of Biomedical Engineering at Columbia University in New York.

To test its effectiveness, health care workers in Rwanda used the tool to do finger-prick blood tests on 96 patients, including women who were at risk of passing sexually transmitted diseases to their unborn children.

The team compared the results with standard enzyme-linked immunosorbent assay and found the results were nearly as accurate.

The test has a sensitivity of 92 to 100%, a measurement of how often the tests accurately identified the target antibodies, and it had a specificity of 79 to 100%, an indicator of how well the test did at ruling out people who were not infected.


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