Provided herein are kits, devices and methods related to blood analysis. In some aspects, kits, devices and methods related to analyzing unprocessed and processed blood are provided, e.g., by processing blood with enzymes and measuring transmittance of light passed through the processed blood and as well as through unprocessed blood. Such kits, devices and methods are useful, e.g., for identifying the presence or absence of infection, and also the type of infection, if present.
