He will also run laboratory tests, which include a complete blood count, the checking of blood urea nitrogen levels, and a biochemistry profile to check for organ functionality. (wagwalking.com)
[Preemies receiving higher amounts of protein grew faster but: «This benefit could not be weighed against the adverse consequences of elevated blood urea nitrogen levels and increased metabolic acidosis and neurodevelopmental abnormalities.»] (babyreference.com)
Obstructing bladder stones, cancer of the urinary tract or even bladder rupture they might cause will all prevent your pet from cleansing its blood of urea nitrogen (BUN). (2ndchance.info)