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    Breaking News

    No Bleeding Required: Anemia Detection via Smartphone

    The app uses photos of fingernails taken on a smartphone to accurately measure hemoglobin.

    No Bleeding Required: Anemia Detection via Smartphone
    Fingernail beds are ideal for detection of anemia because they don't contain melanin. Image courtesy of Mannino et al Nature Communications 2018.
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    Emory Health Sciences12.05.18
    Biomedical engineers have developed a smartphone app for the non-invasive detection of anemia. Instead of a blood test, the app uses photos of someone's fingernails taken on a smartphone to accurately measure how much hemoglobin is in their blood.
     
    The results were published 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, M.D., Ph.D. "This is a standalone app whose accuracy is on par with currently available point-of-care tests without the need to draw blood."
     
    Lam is associate professor of pediatrics at Emory University School of Medicine, a faculty member in the Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory, and a clinical hematologist at the Aflac Cancer and Blood Disorders Center of Children's Healthcare of Atlanta.
     
    The app is part of the Ph.D. work of former biomedical engineering graduate student Rob Mannino, Ph.D., who was motivated to conduct the research by his own experience living with beta-thalassemia, an inherited blood disorder caused by a mutation in the beta-globin gene.
     
    "Treatment for my disease requires monthly blood transfusions," Mannino said. "My doctors would test my hemoglobin levels more if they could, but it's a hassle for me to get to the hospital in between transfusions to receive this blood test. Instead, my doctors currently have to just estimate when I'm going to need a transfusion, based on my hemoglobin level trends."
     
    "This whole project couldn't have been done by anyone but Rob," Lam said. "He took pictures of himself before and after transfusions as his hemoglobin levels were changing, which enabled him to constantly refine and tweak his technology on himself in a very efficient manner. So essentially, he was his own perfect initial test subject with each iteration of the app."
     
    Mannino and Lam say that their 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, possibly reducing side effects or complications of having transfusions too early or too late.
     
    The researchers say that the app should be used for screening, not clinical diagnosis. 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. Clinical diagnostic tools have strict accuracy requirements, but Mannino and Lam think that with additional research, they can eventually achieve the accuracy needed to replace blood-based anemia testing for clinical diagnosis.
     
    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.
     
    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. Personalized calibration, tested on four patients over the course of several weeks, can improve the accuracy to 0.92 grams/deciliter, a degree of accuracy on par with point-of-care blood-based hemoglobin tests. Normal values are 13.5-17.5 grams/deciliter for males and 12.0-15.5 grams/deciliter for females.
     
    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, Mannino said. The app uses image metadata to correct for background brightness and can be adapted to phones from multiple manufacturers.
     
    Mannino and Lam say they are working with a variety of doctors at Emory and Children's—geriatric, internal medicine, neonatologists, transfusion medicine, global health—to obtain additional data and better calibrate their system.
     
    "This is just a snapshot of the accuracy right now," Lam said. "The algorithm gets smarter with every patient enrolled."
     
    The research was supported by the National Science Foundation (Graduate Research Fellowship DGE-1650044 and Southeastern Nanotechnology Infrastructure Corridor 1542174), the 2017 Massachusetts General Hospital Primary Care Technology Prize, and National Institutes of Health (R21 EB025646).
     
    The smartphone anemia app is projected to be available commercially for public download as soon as Spring of 2019.
     
    A patent application has been filed for the anemia app, and Wilbur Lam and Rob Mannino have a financial interest in the success of this product.
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