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Bun normal range low4/7/2024 ![]() The test is frequently requested along with the serum creatinine test since simultaneous determination of these 2 compounds appears to aid in the differential diagnosis of prerenal, renal and postrenal hyperuremia. The determination of serum BUN currently is the most widely used screening test for the evaluation of kidney function. Increased blood urea nitrogen (BUN) may be due to prerenal causes (cardiac decompensation, water depletion due to decreased intake and excessive loss, increased protein catabolism, and high protein diet), renal causes (acute glomerulonephritis, chronic nephritis, polycystic kidney disease, nephrosclerosis, and tubular necrosis), and postrenal causes (eg, all types of obstruction of the urinary tract, such as stones, enlarged prostate gland, tumors). A decline in kidney function can cause an increase in BUN levels. A low BUN level can occur normally in the second or third trimester of pregnancy. There may be slight variations between labs. The normal range of blood urea nitrogen (BUN) is between 7 and 20 mg/dL or 2.5 and 7.1 mmol/L. This is the most important catabolic pathway for eliminating excess nitrogen in the human body. There is no definite value of BUN that would diagnose kidney failure. The ammonia formed in this process is synthesized to urea in the liver. In protein catabolism, the proteins are broken down to amino acids and deaminated. ![]() The normal range of urea nitrogen in blood or serum is 5 to 20 mg/dl, or 1.8 to 7.1 mmol. A value that isnt in the normal range may still be normal for you. The BUN, then, is roughly one-half (28/60 or 0.446) of the blood urea. Within that range, however, a doubling of the values (e.g. Your doctor will compare your BUN results along with other test results, such as creatinine and eGFR (estimated glomerular filtration rate), to decide on next steps. A higher than normal BUN level may be a sign that your kidneys are not working well. Urea is the final degradation product of protein and amino acid metabolism. A low BUN level can occur normally in the second or third trimester of pregnancy. Note that BUN values remain within the normal range until more than 50 of renal function is lost. In general, about 7 - 20 mg/dL is a normal level.
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