Evaluation of blood pressure and urine, with or without special exams were held in four hundred and thirty people apparently healthy. They belonged to both sex with ages ranging from six years and twelve years of age, belonging to the municipal school of Säo Pedro - Juiz de Fora where exists, besides the ambulatory of preventive medicine of the Federal University of Juiz de Fora. The sake of us was investigating the renal diseases among these patients, apparently healthy. The patients were selected for the special studies using markers of renal diseases. Most of the results were not different from the ones of the lierature. Among the 430 patients, 397 were completely normal. Among the patients with urinary ways, one case of Wilms tumor, one patient with bifid spine and others with asymptomatic bacteriuria. There was difficulty in completing the investigation of urinary changes, since they didn't do all the exams