SIADH (Syndrome of Inappropriate ADH secretion)
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þ Diagnosis of SIADH
 - water retention:
  + low Na+ and low osmolarity with
  + non-maximally-dilute urine (i.e., urine osmolality > serum osmolality)
  + urine Na+ more than 30 mg/dL
 AND
 - no edema
 - no thyroid disease
 - no hypotension
 - no adrenal disease
 - no hypovolemia
 - no renal failure
 - no nausea