METHOD FOR NON-INVASIVELY DETERMINING HAEMOGLOBIN AND OXYGEN CONCENTRATIONS IN THE BLOOD

摘要

The invention relates to the field of analysis of the chemical composition of materials and can be used in diagnostic medical equipment for non-invasively determining haemoglobin and oxygen concentrations in the blood. The method comprises exposing a biological tissue to an optical radiation in first, second and third wavelength ranges successively, which comprise the values of 700 nm, 880 nm and 960 nm respectively; receiving the reflected optical radiation; converting the latter into an electric signal; determining the haemoglobin concentration on the basis of the sum of the electrical signals obtained during exposure to the optical radiation in the first and second wavelength ranges, which sum is reduced by a value determined by means of the electric signal obtained during exposure to the optical radiation in the third range; and determining the oxygen concentration on the basis of the difference between the electrical signals obtained during exposure to the optical radiation in the first and second wavelength ranges, which difference is reduced by a value determined by means of the electric signal obtained during exposure to the optical radiation in the third range. The invention makes it possible, when determining haemoglobin and oxygen concentrations, to reduce inaccuracies caused by the presence of water in the biological tissue undergoing examination.