Serum Urea Level High. The normal range of urea nitrogen in blood or serum is 5 to 20 mgdl or 18 to 71 mmol urea per liter. General reference ranges for a normal BUN level are as follows.
Serum urea concentration is important to determine if the kidneys are functioning correctly. The range is wide because of normal variations due to protein intake endogenous protein catabolism state of hydration hepatic urea synthesis and renal urea excretion. By and large a high level of urea signifies that the kidneys arent functioning optimally.
In a study of 26000 critically ill patients those with elevated urea were more likely to suffer infections and to die while hospitalized.
An unsuitable increase in the activation of some organs of the body elevates the blood urea level. The notion that increased plasmaserum urea at admission andor rising plasmaserum urea during the first 24 hours is a poor prognostic sign and indicative of severe acute pancreatitis has been appreciated for many years 2930. The target level for dialysis is to get this down to less than 25mmoll. Congestive heart failure or recent heart attack.
