,LAB:, Na 121 meq/L, K 4.2 meq/L, Cl 90 meq/L, CO2 20meq/L, BUN 12mg/DL, CR 1.0mg/DL, Glucose 99mg/DL, ESR 30mm/hr, CBC WNL with nl WBC differential, Urinalysis: SG 1.016 and otherwise WNL, TSH 2.8 IU/ML, FT4 0.9ng/DL, Urine Osmolality 246 MOSM/Kg (low), Urine Na 35 meq/L,,COURSE:, The patient was initially hydrated with IV normal saline and his orthostatic hypotension resolved, but returned within 24-48hrs. 
,LAB : , Na 121 meq / L , K 4.2 meq / L , Cl 90 meq / L , CO2 20meq / L , BUN 12mg / DL , CR 1.0mg / DL , Glucose 99mg / DL , ESR 30mm / hr , CBC WNL with nl WBC differential , Urinalysis : SG 1.016 and otherwise WNL , TSH 2.8 IU / ML , FT4 0.9ng / DL , Urine Osmolality 246 MOSM / Kg ( low ) , Urine Na 35 meq / L,,COURSE : , The patient was initially hydrated with IV normal saline and his orthostatic hypotension resolved , but returned within 24 - 48hrs .