A sample test method for in vitro diagnostics comprising: measuring an optical characteristic value of a target substance present in a sample; measuring an optical characteristic value of an interfering substance present in the sample; and determining a concentration of the target substance for which interference of the interfering substance is compensated for based on the optical characteristic value of the interfering substance; wherein the measuring the optical characteristic value of the target substance comprises: measuring optical characteristic values of the target substance at a main wavelength and a sub-wavelength, and subtracting the optical characteristic value at the sub-wavelength from the optical characteristic value at the main wavelength; wherein the measuring the optical characteristic value of the interfering substance comprises: measuring optical characteristic values of the sample at a plurality of wavelengths, and determining a final optical characteristic value from the measured optical characteristic values, wherein the final optical characteristic value is the optical characteristic value of the interfering substance; wherein the determining the concentration of the target substance for which interference of the interfering substance is compensated for comprises: determining the concentration of the target substance based on the optical characteristic value of the target substance, determining the concentration of the interfering substance based on the optical characteristic value of the interfering substance, and compensating the concentration of the target substance using the concentration of the interfering substance. measuring an optical characteristic value of a target substance present in a sample; measuring an optical characteristic value of an interfering substance present in the sample; and determining a concentration of the target substance for which interference of the interfering substance is compensated for based on the optical characteristic value of the interfering substance; wherein the measuring the optical characteristic value of the target substance comprises: measuring optical characteristic values of the target substance at a main wavelength and a sub-wavelength, and subtracting the optical characteristic value at the sub-wavelength from the optical characteristic value at the main wavelength; wherein the measuring the optical characteristic value of the interfering substance comprises: measuring optical characteristic values of the sample at a plurality of wavelengths, and determining a final optical characteristic value from the measured optical characteristic values, wherein the final optical characteristic value is the optical characteristic value of the interfering substance; wherein the determining the concentration of the target substance for which interference of the interfering substance is compensated for comprises: determining the concentration of the target substance based on the optical characteristic value of the target substance, determining the concentration of the interfering substance based on the optical characteristic value of the interfering substance, and compensating the concentration of the target substance using the concentration of the interfering substance. measuring optical characteristic values of the target substance at a main wavelength and a sub-wavelength, and subtracting the optical characteristic value at the sub-wavelength from the optical characteristic value at the main wavelength; wherein the measuring the optical characteristic value of the interfering substance comprises: measuring optical characteristic values of the sample at a plurality of wavelengths, and determining a final optical characteristic value from the measured optical characteristic values, wherein the final optical characteristic value is the optical characteristic value of the interfering substance; wherein the determining the concentration of the target substance for which interference of the interfering substance is compensated for comprises: determining the concentration of the target substance based on the optical characteristic value of the target substance, determining the concentration of the interfering substance based on the optical characteristic value of the interfering substance, and compensating the concentration of the target substance using the concentration of the interfering substance. measuring optical characteristic values of the sample at a plurality of wavelengths, and determining a final optical characteristic value from the measured optical characteristic values, wherein the final optical characteristic value is the optical characteristic value of the interfering substance; wherein the determining the concentration of the target substance for which interference of the interfering substance is compensated for comprises: determining the concentration of the target substance based on the optical characteristic value of the target substance, determining the concentration of the interfering substance based on the optical characteristic value of the interfering substance, and compensating the concentration of the target substance using the concentration of the interfering substance. determining the concentration of the target substance based on the optical characteristic value of the target substance, determining the concentration of the interfering substance based on the optical characteristic value of the interfering substance, and compensating the concentration of the target substance using the concentration of the interfering substance.