Patent ID: 7794655

Claim:
A test fluid measurement device comprising: a biosensor that measures the amount of a certain substance that is contained in a test fluid; output acquisition means for acquiring the output value of said biosensor when a reference fluid containing said certain substance that is set to a specified density is applied to said biosensor during a sensitivity calibration of said biosensor; setting means for calibrating the sensitivity of said biosensor by setting a reference value that will be a reference for measurement by said biosensor using said output value that was acquired from said biosensor by said output acquisition means; judgment means for determining whether or not a said output value that is newly acquired from said biosensor by said output acquisition means during said sensitivity calibration by said setting means is suitable to be used as the setting for said reference value based on a previous output value that has already been acquired from said biosensor by said output acquisition means; and detection means for detecting when said reference fluid, which is the subject of acquiring another output value by said output acquisition means, is additionally applied to said biosensor after said judgment means determines that an output value is not suitable as the setting for said reference value, wherein when said judgment means has determined that the new output value is not suitable as the setting for said reference value, the additional application of more reference fluid to said biosensor is detected without performing a cleaning process.