Patent ID: 7875240

Claim:
A method of forming an auto-calibration circuit or label adapted to be used with a first instrument and a second instrument, the first instrument being different from the second instrument and adapted to determine an analyte concentration of a fluid sample, the method comprising the acts of: supplying a first conductive ink pattern layer; supplying a second conductive ink pattern layer including a first plurality of contact areas and a second plurality of contact areas; and supplying insulating material being located between the first and second conductive ink pattern layers, wherein the first conductive ink pattern layer and the first plurality of contact areas define first encoded-calibration information and the first conductive ink pattern layer and the second plurality of contact areas define second encoded-calibration information, the first encoded-calibration information being distinct from the second encoded-calibration information, the first encoded-calibration information is operable with the first instrument to auto-calibrate, the second encoded-calibration information is operable with the second instrument to auto-calibrate, wherein the first and second plurality of contact areas are located only on the second conductive ink pattern layer and the first conductive ink pattern layer is formed in the absence of contact areas.