Three patients with acute intermittent porphyria are deserched. They c
ame to the hospital because of abdominal pain and dark-red urine. The
initial diagnosis was renal colic. Hyponatremia, due to inappropriate
secretion of ADH led to the diagnosis of acute intermittent porphyria.
The finding of hyponatremia in a patient with abdominal pain, without
peritonitis, can be a clue in the diagnosis of a acute intermittent p
orphyria.