How Doctors Diagnose Fibromyalgia

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Young female Caucasian doctor talking to young female patient on exam table

Fibromyalgia is a disorder that causes musculoskeletal pain and sensitivity to touch throughout the body. It is a chronic condition that comes and goes, often accompanied by fatigue, sleep, memory and mood issues. Fibromyalgia can be hard to diagnose because the symptoms are similar to other diseases, including ankylosing spondylitis (an inflammatory disease of the small bones in the spine), an underactive thyroid, lupus, and arthritis. Recent developments in diagnosing fibromyalgia could help people get treatment sooner, which includes medication and physical therapy.

Symptoms of Fibromyalgia

If your doctor thinks you might have fibromyalgia, they will check your symptoms and rule out other possible reasons for them. One key measure is the ‘widespread pain index’—whether you have had generalized musculoskeletal pain for more than three months with no underlying medical condition.

You may also experience:

  • Headaches, including migraines
  • Pain in the face or jaw

After discussing your symptoms, their severity, and areas of the body where you have pain, your doctor may order tests to rule out other conditions. These can include blood tests, X-rays, and scans. If your doctor diagnoses you with fibromyalgia, there are medications, as well as exercise and lifestyle changes, that can help control the symptoms.

Potential Diagnostic Tests for Fibromyalgia

A new test for fibromyalgia is being offered under FDA guidelines, though it is not yet FDA approved. The FM/a test looks for certain patterns within white blood cells to determine whether you have fibromyalgia. Your provider must authorize the test and submit a form to the manufacturer. If it is approved, your doctor will take a blood sample and send it to a lab for analysis.

Many health insurance plans and Medicare cover the FM/a test, but be sure to check your coverage so that you are aware of any costs associated with the testing. The results are based on a scale of 1 to 100, and a score above 50 strongly indicates a diagnosis of fibromyalgia. The manufacturer claims the test is up to 93% accurate, but that statement has not been evaluated by the FDA.

There is also research into a diagnostic test for fibromyalgia using ‘metabolic fingerprinting’ that it is in an earlier stage of development than the FM/a test. It uses a high-tech approach, called vibrational spectroscopy, that measures the energy of certain molecules within the blood. It could be available within the next few years.

Newer diagnostic approaches could lead to earlier treatment for fibromyalgia, a painful and sometimes debilitating condition that affects as many as 10 million people in the United States alone.

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Medical Reviewer: William C. Lloyd III, MD, FACS
Last Review Date: 2020 Jun 12
THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for informational purposes only. It is not a substitute for professional medical advice, diagnosis or treatment. Never ignore professional medical advice in seeking treatment because of something you have read on the site. If you think you may have a medical emergency, immediately call your doctor or dial 911.
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  2. Fibromyalgia. Mayo Clinic.
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  4. Hackshaw KV, Aykas DP, Sigurdson GT, et al. Metabolic fingerprinting for diagnosis of fibromyalgia and other rheumatologic disorder. JBC. 2019;294: 2555-2568. doi: 10.1074/jbc.RA118.005816.
  5. Ankylosing spondylitis. Mayo Clinic.
  6. Behm FG, Gavin IM, Karpenko O, et al. Unique immunologic patterns in fibromyalgia. BMC Clinical Pathology. 2012;12: 25.
  7. What is an FM/a test?, from EpicGenetics, Inc.