Sep 12, 2025 · Laboratory tests help doctors determine what is going on within your body. Many factors affect test results. Find a list of those factors.

Medical Tests Learn about medical tests, including what the tests are used for, why a doctor may order a test, how a test will feel, and what the results may mean.

Learn about different lab tests and understand common terms to improve your health literacy.

A lab test checks a sample of your blood, urine, or other body fluid or tissue to learn about your health. Learn more about how lab tests are used.

Blood Tests see Laboratory Tests Breathing Rate see Vital Signs CAT Scans see CT Scans Chorionic Villi Sampling see Prenatal Testing Colonoscopy COVID-19 Testing CT Scans Diagnostic Imaging …

A BUN, or blood urea nitrogen test, measures the amount of urea nitrogen in your blood. Urea nitrogen is a waste product that forms as your body breaks down proteins.

A laboratory (lab) test is a procedure in which a health care provider takes a sample of your blood, urine, other body fluid, or body tissue to get information about your health.

A comprehensive metabolic panel (CMP) is a routine blood test that measures 14 different substances in a sample of your blood. It provides important information about your metabolism (how your body …

Alpha-1 antitrypsin (AAT) is a protein that protects the lungs and liver from damage. AAT testing is used to diagnose a condition called AAT deficiency.

You don't need to fast for this test. It uses one blood sample. An A1C test can diagnose prediabetes and diabetes. Most people with diabetes have an A1C test at least twice a year to check how well they …