Regular medical checkups, on the one hand, are conducive to early detection, early treatment and early prevention of diseases; on the other hand, they can enhance the understanding of your body’s functional status, improve bad habits and enhance your health in a timely manner. What should I pay attention to before the physical examination? Women avoid menstrual period. A few days before the physical examination, do not eat a greasy diet, do not drink alcohol, and get sufficient rest. On the day of the physical examination, remember not to eat breakfast. Patients with chronic diseases that require long-term medication can take their medication with a small amount of plain water. Do not wear makeup, do not wear jewelry, and choose clothes and shoes and socks that are easy to put on and take off. Which tests can be done in a single blood draw? How much blood needs to be drawn in total? Blood tests for routine blood, blood glucose, blood lipids, liver function and kidney function are all required. For the above tests, only a one-time blood draw is required. A total of 10mL of blood is usually drawn from a superficial vein on the inside of the elbow. What tests require fasting? Barium meal, gastroscopy, colonoscopy, abdominal ultrasound and blood glucose and lipid tests require fasting. In addition, throat tests such as pharyngeal examinations and laryngoscopy can irritate the throat and cause nausea, so eating before the test is also not recommended. However, patients with chronic diseases who need to take medication early in the morning are advised to still take their medication on time, and a small amount of warm water can be taken. What items require holding urine? Ureteral and bladder ultrasound, prostate ultrasound and transabdominal gynecologic ultrasound require urine holding. You can drink water and hold urine after the tests that require fasting are completed and wait for the above tests to be performed. For transvaginal ultrasound of the uterus and both adnexa, you will need to empty your bladder before the test. Is there any radiation from imaging tests? Is it harmful to humans? Ultrasound and magnetic resonance imaging (MRI) are free of ionizing radiation. X-ray, CT, and various imaging tests do have ionizing radiation. However, in medical examinations, the amount of ionizing radiation is strictly controlled within a safe range, and reasonable examinations will not cause significant damage to the human body. Imaging examinations with radiation are generally not recommended for pregnant women. Is it necessary to have cancer screening? According to the American Cancer Society, screening for breast, cervical and colon cancers is needed for the general population. Others, such as lung cancer, prostate cancer, endometrial cancer and liver cancer, are recommended for high-risk groups. The so-called high-risk groups are: close relatives with tumors; long-term exposure to cancer-prone substances; and people with factors that have a high incidence of cancer, such as older age, hepatitis B, chronic atrophic gastritis, etc.