Diagnostic devices systems, methods and computer-readable media store instructions related to determining hemoglobin information using those devices. The methods may include processing a captured image of the reservoir and/or device and the device information to determine color information for the solution and the scale, the color information including one or more color attributes adjusting the color information for the solution based on the color information for the scale and determining hemoglobin information (e.g., hemoglobin level, disease state and/or calculated hematocrit) based on the adjusted color information and a stored profile information associated with the device information.
