What is the role for checking uric acid levels in evaluation of SIADH in hospitalized older adults?  

Uric acid is typically not a first line test for evaluation of hyponatremia. It's usually used when trying to differentiate between hypovolemic states (not SIADH by definition) and euvolemic states (including SIADH). The utility stems from how uric acid is handled in the nephron, i.e., it's ...