A method for optical measurements of desired parameters of the patient's blood
is presented. A state of the blood flow cessation is provided within a measurement
region and maintained during a predetermined time period. Measurement sessions
are performed within this predetermined time period. Each measurement session includes
at least two measurements with different wavelengths of incident light. Obtained
measured data is representative of the time dependence of light response of the
blood in the measurement region. The analyses of the measured data enables the
determination of the desired blood parameters extracted from optical characteristics
associated with the erythrocytes aggregation process during the state of the blood
flow cessation.