Blood and urine analysis revealed severe hyponatremia (109 mmol/L), serum creatinine of 415.9 μmol/L, BUN of 20.39 mmol/L, serum osmolality of 238 mOsm/L and plasma ADH of 0.86 pg/mL together with inappropriately high urine osmolality (159 mOsm/kg) and urine sodium concentration (25 mmol/L). This evidence concerns the gene AVP and Hyponatremia.