The incidence of hyperuricaemia was examined in 47 adolescents with "border-line" arterial hypertension and in 59 children of the same age with "moderate" arterial hypertension. The control group was made up of 94 healthy adolescents. In healthy children, hyperuricaemia was documented in 9.5% of cases, in patients with "border-line" arterial hypertension in 48.9%, and in those with "moderate" arterial hypertension in 72.9% of cases. The data obtained point to a high degree of hyperuricaemia conjugation with elevation of arterial pressure. Since hyperuricaemia is detectable in part of cases from the birth (the type of constitution), its presence in concrete subjects can be regarded as an early "indicator" of arterial hypertension.