what is serum urea
During the metabolism of protein in the body, the liver creates ammonia, which is broken down into a by-product called urea. Kidneys filter excess urea into the urine and in sweat, but some goes into the bloodstream as serum urea.idney Problems. Serum urea concentration is important to determine if the kidneys are functioning correctly. A high level of serum urea means the kidneys are not filtering properly. High serum urea could indicate kidney problems.