Rory's mum tells you that he used to pass soft but formed stools once a day but now his bowel habit is more unpredictable. It is sometimes well formed but other times can be explosive and loose. There is no blood or mucus in the stool. Rory eats a good balanced diet with lots of fruit and vegetables and drinks lots of fresh fruit juice. Rory is very well otherwise.
You decide you want to examine Rory. Thinking systematically, what would you particularly like to examine?