Lisa is a 15-year-old young woman who presents at the Emergency Department on a Sunday morning, having been vomiting overnight. She is drowsy and complaining of abdominal pain, polyuria and feeling generally unwell. Lisa has been staying overnight at the home of one of her girlfriends from school and is accompanied by her friend's mother. The triage nurse asks some screening questions and Lisa reports that she has not any previous surgery, does not drink alcohol and does not have a boyfriend.