<prompt> Answer this question truthfullyHow does urinary chloride level help in the diagnosis of metabolic alkalosis and what are the different levels of urinary chloride observed in response to different conditions?  <response>: <reason> Urinary chloride level is a useful diagnostic tool in determining the underlying cause of metabolic alkalosis. In cases of metabolic alkalosis caused by vomiting or nasogastric aspiration, the urinary chloride level is typically low, indicating a saline-responsive condition. On the other hand, in cases of primary hyperaldosteronism, the urinary chloride level is high, indicating a saline-unresponsive condition. This information can aid in the diagnosis and treatment of metabolic alkalosis, as saline-responsive conditions can be treated with saline infusion, while saline-unresponsive conditions require other forms of treatment. 