hematuria incidence/prevalence measurement percentage of study population with hydronephrosis displaying hematuria at a point in time 2012-11-15T16:59:31Z CMO:0001206 The number of individuals in a study population with preexisting hydronephrosis, that is, dilation of the pelvis and calices of one or both kidneys because of the accumulation of urine resulting from obstruction to urine outflow, which display hematuria, that is blood in the urine, at a certain point in time compared to the total number of individuals in the study population, expressed as a percentage. clinical_measurement_ontology hematuria prevalence in hydronephrosis jsmith