The Fibroscan utilises transient elastography to give a measure of liver stiffness, which corrlelates with liver scarring. A probe is placed over the liver and a high frequency, short vibration applied to the intercostal space. This sets up a shear wave, which propagates through the liver. An ultrasonic transducer measures the velocity of the shear wave, which is used to calculate the liver stiffness in kilopascals. Specific cut-offs have been tested which can predict the presence of fibrosis and cirrhosis with accuracy. The technique has been applied to a number of liver conditions and has been validated in NAFLD.