MEASUREMENT METHOD

In the present invention, a measurement chip having a prism, a metal film, and a capture body is prepared. In a state in which a sample is present on the metal film, when a first light is radiated to the metal film at a first incidence angle less than a critical angle from the prism side, the first light transmitted through the metal film and the sample is scattered in the sample, and the scattered light thereby obtained is detected. In a state in which a substance to be measured is captured by the capture body and a sample is not present on the metal film, a signal indicating the amount of the substance to be measured is detected, the signal being generated by a measurement chip when a second light is radiated to the metal film at a second incidence angle equal to or greater than the critical angle from the prism side. A measurement value indicating the amount of the substance to be measured, the measurement value being determined from the signal, is corrected on the basis of the hematocrit value of the sample determined from the light quantity of the scattered light.