paranoid disorder older term for delusional disorder. paranoid personality disorder a personality disorder in which the patient views other people as hostile, devious, and untrustworthy and reacts in a combative manner to disappointments or to events that he or she considers rebuffs or humiliations.
Blood urea nitrogen (BUN) test. Overview. A common blood test, the blood urea nitrogen (BUN) test reveals important information about how well your kidneys and liver are working. A BUN test measures the amount of urea nitrogen that's in your blood. 1  Your liver produces ammonia â which contains nitrogen â after it breaks down proteins used by your body's cells.  The nitrogen combines with other elements, such as carbon, hydrogen and oxygen, to form urea, which is a chemical waste product.
Urea is found dissolved in blood and is excreted by the renal tubules. In addition, a small amount of urea is also excreted in sweat. Therefore, the BUN level may reflect functioning of the liver and/or kidneys. In the United States, blood urea nitrogen (BUN) is measured in mg/dL.To convert BUN to a concentration in mmol/L (SI units), multiply by 0.357 ([10 dL/1 L]/[28 mg of N/mmol of urea] = 0.357).n addition, a small amount of urea is also excreted in sweat. Therefore, the BUN level may reflect functioning of the liver and/or kidneys. The reference range of the BUN level is 3-20 mg/dL. Individual laboratories may have different reference ranges, since the procedure may vary.