urine measurement urine urea level 2018-12-07T10:08:11Z Any measurement of urea in urine, the fluid waste product excreted by the kidneys. Urea is the main nitrogenous breakdown product of protein metabolism in mammals and is excreted in urine. CMO:0002924 EFO:0011005 VT:0010753 clinical_measurement_ontology sjwang urea measurement