New smartphone app screens for a concerning blood condition using a photo of your fingernails
They’re trying to put the “cure” in manicure.Researchers from Emory University and Georgia Tech developed a smartphone app to screen for anemia using images of a person’s fingernail beds instead of the conventional blood test.Anemia, which is believed to affect over 2 billion people worldwide, occurs when someone does not have enough healthy red blood cells or hemoglobin to carry oxygen to the body’s tissues.The color of the fingernail bed reflects the amount of hemoglobin in the blood.Hemoglobin is the protein in red blood cells that carries oxygen through the body and gives blood its signature red hue.When hemoglobin levels drop, fingernail beds appear paler.
The AI-powered algorithm in the new app was tested on over 9,000 users, whose fingernail selfies were compared to their clinical blood test results.Within seconds of submitting a fingernail photo, the tech estimated hemoglobin levels with remarkable accuracy.When using a hemoglobin threshold of 12.5 g/dL to identify anemia, the app achieved 89% sensitivity and 93% specificity, numbers on par with traditional screening methods.For those with chronic anemia, there’s a “personalization feature” in the app that can be calibrated to a user’s baseline by entering lab-confirmed hemoglobin results alongside the app’s estimates.After personalization, the app’s performance approached levels seen in medical devices cleared by the Food and Drug Administration for non-invasive hemoglobin measurement.Results from this study were published this month in the Proceedings of the National Academy of Sciences.The technology, now licensed to Sanguina, has been made publicly available for download and used more than 1.4 million times in the US.Traditional anemia testing requires blood work, lab access, and, in most cases, insurance coverage.The team behind the app is hopeful that it will prove revolutionary for those with chronic conditions like kidney disease, cancer or nutritional deficiencies that requir...