App that uses fingernails pic to detect iron deficiency launched

US-based Sanguina has launched an app, AnemoCheck, on Google Play Store that uses pictures of fingernails to detect an iron deficiency. The app measures haemoglobin levels by analysing the colour of a person's fingernail beds in a picture. AnemoCheck's developer said it is the only type of app-based system that has the potential to "replace a common blood test".