accumulation of urea in the blood

uremia

Yes, someone can develop Uremia when the digestive system does not clean blood properly. Uremia is usually caused by kidney failure. When kidney failure occurs, it releases toxins back into the blood and can cause Uremia.

== == Excess nitrogenous waste products in the blood and their toxic effects.

http://www.answers.com/uremia?cat=health

Hematuria is the presence of blood in the urine, and uremia is a toxic condition of excess urea (nitrogenous waste) in the bloodstream. Hematuria is a symptomatic condition of the urine, and uremia is an abnormal condition of the blood