Abstract: A test device for measuring the amount of analyte in a fluid sample, including a substrate having thereon: a first analyte reagent formulated to react with the analyte to generate a signal indicative of the presence or amount of analyte in the sample, the first analyte reagent having a first time-based response characteristic; and a second analyte reagent formulated to react with the analyte to generate a signal indicative of the presence or amount of analyte in the sample, the second analyte reagent having a second time-based response characteristic.

Abstract: 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 comprises 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.

Abstract: A composition is provided. The composition comprises an enzyme and a ruthenium- or osmium-based electron transfer agent, wherein the ruthenium- or osmium-based electron transfer agent is a complex [M(A)x(B)y] (X)n wherein M is ruthenium or osmium; A is an amine ligand; each B is a ligand different to A; x is an integer selected from 1 to 5; y is an integer selected from 1 to 5; x+y is 6 or 8; n is an integer selected from 1 to 6; and X is any suitable counterion.