DefinitionA chest x-ray is an x-ray of the chest, lungs, heart, large arteries, ribs, and diaphragm.Alternative NamesChest radiography; Serial chest x-ray; X-ray - chestHow the test is performedThe test is performed in a hospital radiology department or in the health care provider's office by an x-ray technician. Two views are usually taken: one in which the x-rays pass through the chest from the back (posterior-anterior view), and one in which the x-rays pass through the chest from one side to the other (lateral view). You stand in front of the machine and must hold your breath when the x-ray is taken.How to prepare for the testInform the health care provider if you are pregnant. Chest x-rays are generally avoided during the first six months of pregnancy. You must wear a hospital gown and