Patent ID: 8617365

Claim:
An electrochemical test device comprising a bottom substrate having a first electrode disposed thereon, a top substrate having a second electrode disposed thereon, a spacer disposed between the top and bottom substrates and having an opening therein, whereby a sample-receiving space is defined that has a bottom surface having the first electrode disposed thereon, a top surface, opposite the bottom surface, having the second electrode disposed thereon, and side walls formed from edges of the opening in the spacer; and a reagent comprising a redox active material which disperses in a liquid sample placed in the sample-receiving space and is oxidized at the first electrode and reduced at the second electrode when the device is used; wherein in the test device prior to introduction of a liquid sample, the reagent is disposed in a layer, a first part of said layer being disposed on and covering at least a portion of the first or second electrode and a second part of said layer being disposed upon and covering at least a portion of the side walls, wherein said second part of said layer extends on the side walls away from the first part of said layer such that the layer as a whole has a U-shaped cross section.