ABSTRACT
History Steven is a 4-year-old boy seen in the paediatric day unit with a 2-week history of polydipsia and polyuria. Having been dry at night for some time, he has also started wetting the bed. His mother thinks that he has lost some weight. He has been less cheerful than usual and has not wanted to go to school – his mother has put this down to tiredness at the end of his first term. She and Steven’s grandmother have hypothyroidism. There is no significant past medical history and he is fully immunized. He has a 2-year-old brother who is well.
