Patent ID: 7597793

Claim:
A method of performing a measurement on a biological fluid in a test strip comprising: providing a biological fluid test strip including a capillary fill chamber extending a length along the test strip from an intake opening to a terminus, a first pair of electrodes in operative communication with the chamber, and a second pair of electrodes in operative communication with the chamber; dosing the test strip with a biological fluid effective to cause the biological fluid to flow from the intake opening toward the terminus; applying a first test signal to at least one of the first pair of electrodes; measuring a first response to the first test signal; maintaining the first pair of electrodes in an inoperative state after the measuring the first response; applying a second test signal to at least one of the second pair of electrodes, wherein the second test signal is a signal having an AC component; measuring a second response to the second test signal to determine sample sufficiency of the dose of the biological fluid; and performing a measurement upon the biological fluid after the measuring the second response.