Patent ID: 8759106

Claim:
A method of reducing sample carryover in an integrated chemistry and immunoassay analyzer, the method comprising: pumping a first wash fluid volume through an interior region of a probe; pumping a second wash fluid volume on an exterior surface of the probe, wherein the pumping of the first wash fluid volume through the interior region of the probe is terminated prior to terminating the pumping of the second wash fluid volume on the exterior surface of the probe, and wherein the pumping of the second wash fluid volume on the exterior surface of the probe starts prior to pumping the first wash fluid volume through the interior region of the probe; selecting a length of time of the pumping of the second wash fluid on the exterior surface based on an amount of fluid aspirated inside the probe; and using a pump controller to pump additional wash fluid for an extended period of time on the exterior of the probe if the amount of fluid aspirated exceeds a predetermined threshold.