This is a medical question of type : exams and tests 
 How to diagnose Childhood Liver Cancer ? 
 Tests that examine the liver and the blood are used to detect (find) and diagnose childhood liver cancer and find out whether the cancer has spread. The following tests and procedures may be used:         -   Physical exam and history : An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient's health habits and past illnesses and treatments will also be taken.    -   Serum tumor marker test : A procedure in which a blood sample is checked to measure the amounts of certain substances released into the blood by organs, tissues, or tumor cells in the body. Certain substances are linked to specific types of cancer when found in increased levels in the blood. These are called tumor markers. The blood of children who have liver cancer may have increased amounts of a hormone called beta-human chorionic gonadotropin (-hCG) or a protein called alpha-fetoprotein (AFP). Other cancers and certain noncancer conditions, including cirrhosis and hepatitis, can also increase AFP levels.    -   Complete blood count (CBC): A procedure in which a sample of blood is drawn and checked for the following:                - The number of red blood cells, white blood cells, and platelets.      - The amount of hemoglobin (the protein that carries oxygen) in the red blood cells.      - The portion of the blood sample made up of red blood cells.             -   Liver function tests : A procedure in which a blood sample is checked to measure the amounts of certain substances released into the blood by the liver. A higher than normal amount of a substance can be a sign of liver damage or cancer.    -   Blood chemistry studies : A procedure in which a blood sample is checked to measure the amounts of certain substances, such as bilirubin or lactate dehydrogenase (LDH), released into the blood by organs and tissues in the body. An unusual (higher or lower than normal) amount of a substance can be a sign of disease.     -   Epstein-Barr virus (EBV) test: A blood test to check for antibodies to the EBV and DNA markers of the EBV. These are found in the blood of patients who have been infected with EBV.    -  Hepatitis assay : A procedure in which a blood sample is checked for pieces of the hepatitis virus.    -   MRI (magnetic resonance imaging) with gadolinium : A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the liver. A substance called gadolinium is injected into a vein. The gadolinium collects around the cancer cells so they show up brighter in the picture. This procedure is also called nuclear magnetic resonance imaging (NMRI).    -   Ultrasound exam: A procedure in which high-energy sound waves (ultrasound) are bounced off internal tissues or organs and make echoes. The echoes form a picture of body tissues called a sonogram. The picture can be printed to be looked at later. In childhood liver cancer, an ultrasound exam of the abdomen to check the large blood vessels is usually done.    -   CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography. In childhood liver cancer, a CT scan of the chest and abdomen is usually done.    -   Abdominal x-ray : An x-ray of the organs in the abdomen. An x-ray is a type of energy beam that can go through the body onto film, making a picture of areas inside the body.    -   Biopsy : The removal of a sample of cells or tissues so it can be viewed under a microscope to check for signs of cancer. The sample may be taken during surgery to remove or view the tumor. A pathologist looks at the sample under a microscope to find out the type of liver cancer.  The following test may be done on the sample of tissue that is removed:               -  Immunohistochemistry : A test that uses antibodies to check for certain antigens in a sample of tissue. The antibody is usually linked to a radioactive substance or a dye that causes the tissue to light up under a microscope. This type of test is used to check for a certain gene mutation and to tell the difference between different types of cancer.