Causes of High Serum Urea Nitrogen

The normal value of serum urea nitrogen is 2.86-7.14mmol/L. High serum urea nitrogen may be related to renal function impairment. It is common in primary glomerulonephritis, pyelonephritis, chronic renal failure, renal tumor and other diseases. High serum urea nitrogen may also occur due to excessive protein intake, severe trauma, gastrointestinal hemorrhage and high fever.