Diagnostic aids are tools used by medical professionals to diagnose and treat illnesses. These aids include scans, tests, x-rays, and MRIs. Scans are imaging tests that use sound waves or radiation to create pictures of the inside of the body. Tests involve taking samples of blood, urine, or other bodily fluids for laboratory analysis. X-rays use radiation to create images of the inside of the body. MRI scans use magnetic fields and radio waves to create detailed images of the body. All of these diagnostic aids help medical professionals diagnose and treat illnesses.