Professor Aiden McCormick:

That is the fibre scan. We used to do biopsies for either fibrosis or cirrhosis, but this is basically an ultrasound scan. It is put on its side and it basically gives a little knock on the side and the speed of transmission of that wave through the liver is directly related to how stiff the liver is and how much fibrosis there is. It can tell you definitely if a liver is normal, or cirrhotic, or if there is some degree of fibrosis. It gives a number-----