An electrochemical test device for determining a concentration of an analyte in a fluid sample is provided. The electrochemical test device comprises a set of electrodes including a working electrode for the analyte and sensing chemistry for the working electrode, wherein the sensing chemistry is disposed on the working electrode in at least one layer, each layer comprising a diaphorase, an electron transfer agent having a standard redox potential in the range of −0.52 to 0.18 V, an NAD(P)+-dependent dehydrogenase and a cofactor for the NAD(P)+-dependent dehydrogenase.