The U.S. Food and Drug Administration has sent a letter to BioSense Technologies over its iPhone uChek urinalysis system, asking why its medical app hasn't been cleared by the agency. The app is one of the first that turns the iPhone into a medical device, designed to read urinalysis test strips that are normally examined by users and compared to a color-coded chart. With the uChek system, patients can take a picture of the strip with the iPhone's camera and then receive an automated readout of parameters like glucose, urobilinogen, pH, ketone and more. The app also stores results which then can be analyzed over time. Though medical device makers have adopted the iPhone for some measurements like blood glucose monitoring for diabetics, large scale use of smartphones and tabl
