The information from primary medical documentation and questionnaires of children and their parents concerning the health of children of 12-14 years old is compared. The lack of correspondence is marked between the subjective perception of health (both children and their parents) and the results of comprehensive evaluation of health status based on the medical criteria. The more detailed analysis permitted to mark out a number of possible causes of such a lack of correspondence: absence of changes in general state among children with compensated chronic pathology, subjective overstating of estimate of real level of health by children and parents, hypo diagnostics of certain pathologic states in school children by medical professionals. The results revealed the need in more close attention of pediatricians to the child subjective self-perception of health, active identification of complaints and pathologic symptoms during dispanserization examinations of schoolchildren.