Urea nitrogen 10.2mmol/L over the normal range is considered high and is associated with diseases such as renal impairment, prerenal oliguria and excessive protein breakdown. The normal value of urea nitrogen is 3.2-7.1mmol/L for adults and 1.8-6.5mmol/L for infants and children, and urea nitrogen 10.2mmol/L exceeding the normal value is considered high. Acute glomerulonephritis, chronic pyelonephritis, and renal failure can cause elevated urea nitrogen due to renal parenchymal injury, glomerulosclerosis, and tubular atrophy. Severe dehydration, pyloric obstruction, etc. can cause prerenal oliguria, resulting in the production of urea that cannot be excreted in the urine, and elevated urea nitrogen occurs. Upper gastrointestinal bleeding, burns, etc. cause excessive protein breakdown, resulting in elevated urea nitrogen. If you have elevated urea nitrogen, it is recommended that you go to a regular hospital in time to find out the cause and follow the doctor’s instructions for standardized treatment.