Most adoption agencies require a physical exam of prospective adoptive parents or at least a current tuberculosis test (X-ray or scratch test). Some adoption agencies that place infants only with infertile couples require that the physician verify the infertility. Others just want to know that you are essentially healthy, have a normal life expectancy and are able physically and emotionally to handle the care of a child. If you are in a doctor's care for a medical condition that is under control (high blood pressure or diabetes, for instance, that is managed by diet and medication), you can probably still be approved as an adoptive family. A serious health problem that affects life expectancy may prevent approval.
Source: National Adoption Information Clearinghouse