Patent ID: 8535497

Claim:
A measuring device for measuring a component in blood, comprising: a sensor, comprising: a first analysis portion for measuring the component in the blood sample, comprising an electrode system, an oxidoreductase that acts upon the component, and a mediator are provided; and a second analysis portion for measuring a Hct value of the blood sample, comprising an electrode system that comprises a working electrode and a counter electrode, a mediator being provided on the counter electrode but not on the working electrode for measuring the Hct value, wherein the first analysis portion measures the component in the blood with a redox reaction between the component and the oxidoreductase in the presence of the mediator by application of a voltage to the electrode system of the first analyzing portion and detecting an oxidation current or a reduction current caused to flow, the second analysis portion measures the Hct value of the blood sample by application of a voltage to the blood supplied to the second analysis portion, and detecting a value of the oxidation current or the reduction current, and the oxidoreductase and the mediator of the first analysis portion are present on the counter electrode of the second analysis portion; a holder that holds the sensor; a voltage source for the first analysis portion of the sensor; a detector that detects an oxidation current or a reduction current of the first analysis portion; a calculator that calculates an amount of the component from a value of the detected current of the first analysis portion; a voltage source for the second analysis portion of the sensor; a detector that detects an oxidation current or a reduction current of the second analysis portion; a calculator that calculates a Hct value of the blood from a value of the detected oxidation or reduction current of the second analysis portion, the calculated amount of the component being corrected using the Hct value; and a controller configured to direct application of a voltage by the voltage source for the first analysis portion, communicate with the detector of the first analysis portion, direct application of a voltage by the voltage source for the second analysis portion, and communicate with the detector of the second analysis portion.