Unfortunately, there is still no medical test that confirms or rules out fibromyalgia. Instead, the physician will first test for other conditions that present similar symptoms, like rheumatoid arthritis and multiple sclerosis. The tests could include a complete blood count, thyroid function test, erythrocyte sedimentation rate test, and a test to check the Vitamin D level.
The doctor will perform a physical exam of the joints and muscles but will have to rely heavily on your symptoms to make a fibromyalgia diagnosis. For example, common symptoms include extreme fatigue, general pain that has lasted for more than three months, headaches, and depression.
As a note, some doctors will still use the test in which pressure is applied to 18 points on the body to identify tenderness. If 11 out of the 18 are tender, fibromyalgia is a likely diagnosis. However, since fibromyalgia symptoms are not constant, the results of this test may not be accurate. Even if the test is used, it is supplemented with the other tests mentioned.