Paediatricsmiddle twist
A 2-year-old boy weighing 13 kg is brought to the emergency department 40 minutes after his mother found him beside her open bottle of iron tablets, with an orange-stained tongue. The bottle held thirty tablets when it was dispensed yesterday and eighteen remain. He is alert and playing, has not vomited, and his abdomen is soft and non-tender. She cannot remember which iron preparation she was given. Which one of the following pieces of information is essential before his risk can be assessed?