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A Smartphone app can detect Anemia just by viewing Fingernails instead of Blood Test.

Posted on December 29, 2018

Biomedical engineers have developed a smartphone app with the aim of non-invasive detection of anemia. Instead of a blood test, the app uses photos of someone’s fingernails taken on a smartphone to determine whether the level of hemoglobin in their blood seems low.

The researchers published their results on Tuesday, December 4, 2018, in Nature Communications.

“All other ‘point-of-care’ anemia detection tools require external equipment, and represent trade-offs between invasiveness, cost, and accuracy,” said principal investigator Wilbur Lam. “This is a standalone app that can look at hemoglobin levels  without the need to draw blood.”

The app should be used for screening, not clinical diagnosis.

A graphic depiction of the smartphone app that tests for anemia. Credit: Georgia Tech

The app could facilitate self-management by patients with chronic anemia, allowing them to monitor their disease and to identify the times when they need to adjust their therapies or receive transfusions, the researchers said. That may reduce side effects or complications of having transfusions too early or too late.

The technology could be used by anyone at any time and could be especially appropriate for pregnant women, women with abnormal menstrual bleeding, or runners/athletes. Its simplicity means it could be useful in developing countries.

Anemia is a blood condition that affects two billion people worldwide and can lead to fatigue, paleness and cardiac distress if left untreated. The current gold standard for anemia diagnosis is known as a complete blood count (CBC).

The researchers studied fingernail photos and correlated the color of the fingernail beds with hemoglobin levels measured by CBC in 337 people: some healthy, and others with a variety of anemia diagnoses. The algorithm for converting fingernail color to blood hemoglobin level was developed with 237 of these subjects and then tested on 100.

An illustration of how the anemia test smartphone app works. Credit: Lam / Emory / Georgia Tech

The researchers were able to show that a single smartphone image, without personalized calibration, can measure hemoglobin level with an accuracy of 2.4 grams/deciliter with a sensitivity of up to 97 percent.

In the app, the use of fingernail beds, which do not contain melanin, means the test can be valid for people with a variety of skin tones. The accuracy is consistent for dark or light skin tones.

The smartphone anemia app is projected to be available commercially for public download as soon as Spring of 2019.

News Source: Georgia Tech

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