When you come to the hospital the doctors and nurses will do lots of different tests on you to understand more about what's wrong with you. They will use this information to help them to understand what they need to do to help make you better. We've explained some of these tests in this section, you just have to click on the names of the tests below. Also we have explained the story of what happens if you have to go for a heart operation or a cardiac catherisation in the two books in Toby's hands. The two books tell the story of Holly and Aisling when they came to Crumlin.