Patent ID: 8828322

Claim:
A diagnostic device for measuring hematocrit (HCT) or prothrombin time (PT) of a sample, comprising: a sensor device; and a test card assembly including one or more pairs of electrodes, wherein the sensor device comprises a test card receiving unit for accommodating the test card assembly; a power source for providing an AC test signal at a constant frequency to electrodes of the test card assembly; a signal retrieving unit coupled to the test card assembly; a microprocessor in the sensor device programmed for (i) performing a reactance analysis of a sample provided on the test card assembly by comparing the AC test signal and a response signal from the test card assembly in response to the AC test signal, calculating a change in phase of the AC test signal, and calculating a reactance from the change in phase of the AC test signal, and (ii) determining PT or HCT of the sample; and, a display for displaying the PT or HCT of the sample.