The normal range of blood urea nitrogen is 3.2-7.1 mmol/L, and above 7.1 mmol/L is considered high.
Blood urea nitrogen is one of the end products of amino acid metabolism. Urea generated in the liver enters the blood circulation and is mainly excreted through the kidneys, and the proportion of extra-renal pathways (e.g. sweat) is very small. High blood urea nitrogen may be related to organic renal impairment such as glomerulonephritis and pyelonephritis, or to pre-renal causes such as severe dehydration.
Blood urea nitrogen is related to the body’s protein catabolism and metabolism, protein intake in food and the excretion capacity of the kidneys. If it exceeds the normal reference range of 7.1 mmol/L, it suggests that it is high, and the cause needs to be clarified under the guidance of a doctor.
When the blood urea nitrogen is high, it is recommended to go to the regular hospital in time, under the guidance of the doctor combined with the cause of targeted treatment.