Method of identifying an error in performing a test with a test strip

A method of determining a corrected glucose concentration in view of a hematocrit level is provided herein. The method comprises: introducing a sample to an electrochemical cell that includes a first electrode and a second electrode; applying a first test voltage Vi for a first time interval Ti between the first electrode and the second electrode, sufficient to measure a relatively small amount of current; applying a second test voltage V 2 for a second time interval T 2 between the first electrode and the second electrode sufficient to at least partially oxidize a reduced mediator at the second electrode, wherein the second test voltage V 2 is applied after the first test voltage Vi; applying a third test voltage V 3 for a third time interval T 3 between the first electrode and the second electrode sufficient to at least partially oxidize the reduced mediator at the first electrode; calculating an initial analyte concentration of the sample based on test current values determined during the second time interval T 2 and the third time interval T 3 ; calculating an error source of the sample; and calculating a corrected analyte concentration based on the initial analyte concentration and the error source, wherein the analyte is glucose and the error source is a hematocrit level H of the sample, such that the corrected glucose concentration G 2 is based on the initial glucose concentration G i and the hematocrit level H.