Depending on what your doctor is diagnosing, the test can use many different enzymes and identify many different antibodies. If your blood contains the antibody your doctor is looking for ...

leading to inaccurate or invalid test results. See below to find out if your box of COVID-19 tests is still OK to use, as it's possible the expiration date has been extended. How do I know if the ...

A complement test is commonly used to diagnose autoimmune diseases or other immune function conditions. Certain diseases can have abnormal levels of a particular complement. A doctor can use a ...

Doctors also often use this test to assess the need for an abnormal electrical test of the heart, called an electrocardiogram (EKG). Additionally, they may use an echocardiogram to monitor how ...

Normal levels are typically 0.4 to 4.0 milliunits per liter (mU/L) Doctors can use TSH test results to diagnose thyroid disorders, such as hypothyroidism and hyperthyroidism. The pituitary gland ...