Patent ID: 8388821
Filing Date: 2013-03-05
Classification: C12Q,G01N

Abstract:
1. A method of determining a type of fluid sample applied to the test strip, the method comprising: providing a test strip having a reference electrode and a working electrode, wherein the working electrode is formed with a plurality of microelectrodes and is coated with a reagent layer; applying a fluid sample to the test strip for a reaction period; applying a test voltage between the reference electrode and the working electrode; measuring a test current as a function of time; measuring a steady state current value when the test current has reached an equilibrium; calculating a ratio of the test current to the steady state current value; plotting the ratio of the test current to the steady state current value as a function of the inverse square root of time; calculating an effective diffusion coefficient from the slope of the linearly regressed plot of the ratio of the test current to the steady state current value as a function of the inverse square root of time; determining a type of a fluid sample applied to the test strip by comparing a measured value for the effective diffusion coefficient against an acceptance range for a bodily fluid and a control solution; and displaying an appropriate error message if the effective diffusion coefficient does not pass the acceptance range for the type of fluid sample applied to the test strip.