Table 1. Laboratory data obtained at admission and at time of nephrology consultation.

Determination	Value: admission	Value: time of consultation
Serum Na+ concentration	132 mEq/L	122 mEq/L
Serum K+ concentration	4.4 mEq/L	4.3 mEq/L
Serum creatinine	1.2 mg/dL	0.7 mg/dL
Serum osmolality		251 mOsmol/kg H2O
Urine osmolality		410 mOsmol/kg H2O
Urine Na+ concentration		138 mEq/L
Urine K+ concentration		21 mEq/L