The determination of serum BUN currently is the most widely used screening test for the evaluation of kidney function. Therefore, renal excretion of BUN is decreased and BUN levels rise. Hypovolemia, shock, burns, dehydration - with reduced blood volume, renal blood flow is diminished. The normal adult range is 6 to 25, with 15.5 being the optimal value. (BUN): Range (SI Units) Range (Conventional) Adult: 3.577.14 mmol/L: 1020 mg/dL: Child: 1.796. The BUN/creatinine ratio is a good measurement of kidney and liver function. For adult men, the normal BUN values fall between 8 to 24 mg/dL, whereas, for adult women, the normal values tend to fall between 6 and 21 mg/dL. The amount and kinds of waste in the urine make it lighter or darker. 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). Normal urine color ranges from pale yellow to deep amber in color, depending on the concentration of the urine. This is the most important catabolic pathway for eliminating excess nitrogen in the human body. If your kidneys are not able to remove urea. A BUN test is done to see how well your kidneys are working. Urea is made in the liver and passed out of your body in the urine. The first/top number (called systolic pressure) is the pressure in your blood vessels during each heartbeat - when blood is actively pumped out of your heart to the rest of your body. Urea is made when protein is broken down in your body. Your blood pressure is reported as 2 separate numbers for example 120/80 or 120 over 80. The ammonia formed in this process is synthesized to urea in the liver. A blood urea nitrogen (BUN) test measures the amount of nitrogen in your blood that comes from the waste product urea. In protein catabolism, the proteins are broken down to amino acids and deaminated. Dehydration (not drinking enough water) High-intensity exercise.

Urea is the final degradation product of protein and amino acid metabolism. A BUN test measures the amount of urea nitrogen in the blood, which is a waste product of protein breakdown.

Bun normal range