Before a full body check, you should get enough sleep, avoid eating or drinking anything at least 8-10 hours before checkup, avoid consuming alcohol at least 24 hours prior to checkup, and make sure you carry reports of any diagnosis done earlier. Females should maintain a gap of 7 days before and after the menstruation cycle for the test. Any other health condition, such as pregnancy or disease, should be reported to the doctor before the checkup.