If you suffer from one of the many auto-immune diseases that can affect the thyroid, one of the first questions that you may have is how to test for autoimmune thyroid disease. Auto-immune disorders affect the body's ability to properly respond to external stimuli such as infections, medications, or food allergies. Common examples of immune system problems include inflammatory disorders, systemic Lupus erythematosus, rheumatoid arthritis, and autoimmune thyroid disease (all classified as auto-immune thyroid disorders). There are various ways in which the immune system can fail, allowing infection or other triggers to affect the body's ability to function normally. The best way to diagnose a thyroid condition or other immune related issue is to undergo multiple blood tests and to get a medical evaluation. The doctor will look at your history, physical examination, laboratory work, and imaging studies to come up with an overall diagnosis and treatment plan. Some tests may be done separately by yourself or by your family doctor, while others may be done in a medical setting or lab. The tests range from simple testing of your blood to more complex tests that look at your thyroid and other body systems. The most commonly used laboratory test to examine how to test for autoimmune diseases is the TSH test, or thyroid stimulating hormone test. This test helps to determine if your thyroid is functioning properly. Your doctor will take a sample of your blood and test it for levels of TSH. Low levels of TSH mean that your thyroid is functioning properly and your immune system is working properly. High levels of TSH indicate that your immune system has become compromised and that infection, disease or other triggers are causing an overactive response in your thyroid. These tests can be positive or negative. Other tests commonly used to examine how to test for autoimmune diseases include biopsy tests and blood tests. Blood tests can be positive or negative. Diagnostic tests like these are only able to detect whether the immune system is functioning properly. They do not provide an actual diagnosis or prognosis of your condition. For more information on tests performed to find out if you have this type of disease there are several resources available. You can research your own symptoms and the possible reasons for them through the internet or through your health care provider. Learning about how to test for autoimmune diseases can help you make an informed decision regarding your treatment options.