Minor signs and symptoms of toxicity in a young woman in spite of massive thyroxine ingestion.

The serum concentrations of thyroxine, 3,5,3'-triiodothyronine and 3,3',5'-triiodothyronine were followed during nine days in a case of acute thyroxine intoxication. On admission the concentrations were 11-12 times, 5-6 times and 16 times the normal mean, respectively. There was a striking discrepancy between the high concentrations of active hormones and the minor clinical symptoms.