part of part of has part has part has_part characteristic of has modifier urea abnormal blood homeostasis abnormal circulating urea level 2025-11-18T20:26:43Z the amount of urea in the blood may either be expressed as the amount of urea nitrogen in the plasma or serum, commonly called blood urea nitrogen (see child term), or as the whole molecule abnormal blood urea concentration MP:0014809 any anomaly in the blood of the amount or concentration of urea (carbonyl group with two C-bound amine groups) amount abnormal blood