What is being tested?
AFP is a protein that is normally produced by the developing fetus. However, it can also be produced by certain tumours. Raised levels of AFP are found in the vast majority of patients with a type of liver cancer called hepatocellular carcinoma. It is also raised in some patients with cancer of the testis.

How is the sample collected for testing?
A blood sample is taken by needle from a vein in the arm.