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Many surgeons order routine laboratory tests before admission to the hospital, or even before certain outpatient procedures, to identify potential problems that might complicate surgery if not detected and treated early. According to the US Food and Drug Administration (FDA), some of the most common tests performed before surgery (and possible reasons/symptoms why they are performed) are included in the following list:
Chest X-rays - may be used to help diagnose causes of shortness of breath, chest pain, cough, fever of unknown origin, and other abnormal heart, respiratory, and lung sounds.