<prompt> 29 year old female with history of Sjogrens syndrome presents with a 2 day episode of watery diarrhea 2 days ago. Physical examination is unremarkable. Because of her history, the physician decides to check her urine electrolytes. Urine chemistry: K 31, Na 100, Cl 105. Her current diagnosis is?Renal tubular acidosisHypochloremic Metabolic alkalosisMalignant hypeensionRespiratory alkalosis  <response>: The urine electrolytes are used to distinguish between A and diarrhea UAG is an indirect measure of ammonium excretion UAG Na K - Cl UAG 100 31 - 105 26 A positive UAG suggest A because in the setting of diarrhea, ammonium chloride concentration in the urine would be high and the UAG would be negative. A positive value suggests that the kidney is unable to adequately excrete ammonium, leading to a reduction in net acid excretion and thus metabolic acidosis. Hyperkalemia, acidemia is seen in type IV A Type IV A associated with Diabetes Mellitus 