Method for quantitatively determining lipids, haemoglobin and bilirubin in a body fluid sample, comprising the steps of: a) transirradiating the body fluid sample with light at a multiplicity of wavelengths λ; b) capturing a first measurement value A1 at a first wavelength λ1 at which the absorbance not caused by lipids is negligible; c) capturing a second measurement value A2 at a second wavelength λ2 at which the absorbance not caused by bilirubin and haemoglobin and lipids is negligible; d) capturing a third measurement value A3 at a third wavelength λ3 at which haemoglobin has an absorbance maximum; e) capturing a fourth measurement value A4 at a fourth wavelength λ4 at which the absorbance not caused by bilirubin and haemoglobin and lipids is negligible; f) determining a parameter q using the formula: q = lnA 1 − lnA 2 λ 1 − λ 2 and a parameter p using the formula: p = A 2 e λ 2 ⋅ q g) calculating an exponential approximation curve (L 0) of the form: E = f λ = p ⋅ e λ ⋅ q for the absorbance E of the lipids; h) determining a first theoretical absorbance value E H1 for haemoglobin, corresponding to the difference between the third measurement value A3 and the value of the approximation curve (L 0) at the third wavelength λ3; i) checking whether the first theoretical absorbance value E H1 for haemoglobin is greater than 0 and, if it is greater than 0, determining a second theoretical absorbance value E H2 for haemoglobin by multiplying the first theoretical absorbance value E H1 for haemoglobin by a first predetermined proportionality factor which reflects the ratio between absorbance values for haemoglobin at the third wavelength λ3 and absorbance values for haemoglobin at the fourth wavelength λ4; j) determining a first theoretical absorbance value E B1 for bilirubin, corresponding to the difference between the fourth measurement value A4 and the sum of the value of the approximation curve (L 0) at the fourth wavelength λ4 and of the second theoretical absorbance value E H2 for haemoglobin; k) checking whether the first theoretical absorbance value E B1 for bilirubin is greater than 0; and l) if the check in step i) reveals that the first theoretical absorbance value E H1 for haemoglobin is greater than 0, assigning the first theoretical absorbance value E H1 for haemoglobin to one of multiple predefined haemoglobin concentration levels, and m) if the check in step k) reveals that the first theoretical absorbance value E B1 for bilirubin is greater than 0, assigning the first theoretical absorbance value E B1 for bilirubin to one of multiple predefined bilirubin concentration levels, and n) assigning the first measurement value A1 to one of multiple predefined lipid concentration levels. a) transirradiating the body fluid sample with light at a multiplicity of wavelengths λ; b) capturing a first measurement value A1 at a first wavelength λ1 at which the absorbance not caused by lipids is negligible; c) capturing a second measurement value A2 at a second wavelength λ2 at which the absorbance not caused by bilirubin and haemoglobin and lipids is negligible; d) capturing a third measurement value A3 at a third wavelength λ3 at which haemoglobin has an absorbance maximum; e) capturing a fourth measurement value A4 at a fourth wavelength λ4 at which the absorbance not caused by bilirubin and haemoglobin and lipids is negligible; f) determining a parameter q using the formula: q = lnA 1 − lnA 2 λ 1 − λ 2 and a parameter p using the formula: p = A 2 e λ 2 ⋅ q g) calculating an exponential approximation curve (L 0) of the form: E = f λ = p ⋅ e λ ⋅ q for the absorbance E of the lipids; h) determining a first theoretical absorbance value E H1 for haemoglobin, corresponding to the difference between the third measurement value A3 and the value of the approximation curve (L 0) at the third wavelength λ3; i) checking whether the first theoretical absorbance value E H1 for haemoglobin is greater than 0 and, if it is greater than 0, determining a second theoretical absorbance value E H2 for haemoglobin by multiplying the first theoretical absorbance value E H1 for haemoglobin by a first predetermined proportionality factor which reflects the ratio between absorbance values for haemoglobin at the third wavelength λ3 and absorbance values for haemoglobin at the fourth wavelength λ4; j) determining a first theoretical absorbance value E B1 for bilirubin, corresponding to the difference between the fourth measurement value A4 and the sum of the value of the approximation curve (L 0) at the fourth wavelength λ4 and of the second theoretical absorbance value E H2 for haemoglobin; k) checking whether the first theoretical absorbance value E B1 for bilirubin is greater than 0; and l) if the check in step i) reveals that the first theoretical absorbance value E H1 for haemoglobin is greater than 0, assigning the first theoretical absorbance value E H1 for haemoglobin to one of multiple predefined haemoglobin concentration levels, and m) if the check in step k) reveals that the first theoretical absorbance value E B1 for bilirubin is greater than 0, assigning the first theoretical absorbance value E B1 for bilirubin to one of multiple predefined bilirubin concentration levels, and n) assigning the first measurement value A1 to one of multiple predefined lipid concentration levels.