The colorimetric readout is designed to be read by eye using a visual "read guide" allowing the reader to make a semi-quantitative estimate or assign a categorical value into one of three bins. Alternatively, if the device is scanned (e.g. desk-top scanner) or photographed (e.g. cell phone or standard digital camera, see (9)) and read with image-analysis software, it should be possible to generate a quantitative result. Additionally, multiple control zones notify the user of insufficient sample volume, hemolysis, or damaged reagents.