Update: some commenters asked about the BUN: 6 mg/dL. FYI today the Cr is down to 0.28 and the BUN fell to 3!
The patient has SIADH and low creatinines are a usual finding. She also has a crazy low uric acid of 1.4. Not quite Uricase low but getting close. Her admission sodium was 108, her urine sodium today was a whopping 156 with a urine potassium of 34. So if you calculate her electrolyte free water clearance (the amount of her urine which is electrolyte free water):