FIELD: medicine. SUBSTANCE: method involves placing patient blood serum drop between refractometer prisms and reading the result from instrument scale. Blood serum refraction coefficient changing below physiological norm, trauma is considered to be the case. Blood serum refraction coefficient being less than 1.3485 relative units, the primary trauma is considered to be severe. Blood serum refraction coefficient being from 1.3485 to 13495 relative units, the trauma is considered to be light. EFFECT: enhanced accuracy, low cost of the method. 1 tbl
