Patent ID: 8663442

Claim:
A system for performing a measurement on a biological fluid, the system comprising: a test strip comprising a capillary fill chamber extending a length along the test strip from an opening to a terminus, a measurement zone in the chamber positioned intermediate the opening and the terminus, and at least two dose sufficiency electrodes in operative communication with the chamber, the dose sufficiency electrodes being positioned intermediate the measurement zone and the terminus, wherein the dose sufficiency electrodes have a first axis substantially parallel to the length of the capillary chamber and a second axis substantially perpendicular to the length of the capillary fill chamber with the first axis being of greater length than the second axis, the dose sufficiency electrodes defining a gap there between extending longitudinally of the capillary fill chamber; and a circuit operable to: a) apply an AC signal to at least one of the dose sufficiency electrodes; b) measure a response to said signal; and c) compare the response to a predetermined threshold to indicate whether the biological fluid has progressed a selected distance up the gap between the dose sufficiency electrodes.