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Home Knowledge Center Wellness Library Lab Tests for Fibromyalgia

Lab Tests for Fibromyalgia

Overview

There are no specific tests that can confirm a diagnosis of fibromyalgia. But you may have lab tests to rule out other diseases. Or these tests can find out if you have another disease along with fibromyalgia.

Fibromyalgia may occur along with other joint and muscle (rheumatic) diseases, such as rheumatoid arthritis. Finding these other conditions is important, because they may need different treatment.

If your doctor thinks that you may have another muscle or joint disease based on your symptoms, history, and physical exam, your doctor may do:

  • A complete blood count (CBC).
  • An erythrocyte sedimentation rate (ESR) or a C-reactive protein (CRP) test. It can help find diseases that cause inflammation, such as polymyalgia rheumatica.
  • Thyroid hormone tests to check for low or high thyroid gland activity. Thyroid problems can cause fatigue and muscle soreness.
  • A blood calcium level test to check for a low or high calcium level. A low level can cause muscle cramps. A high level may mean you have an overactive parathyroid gland.

The test results may show that you have a disease other than fibromyalgia. Or you might have both fibromyalgia and another condition. Test results can be false-positive.

Doctors don't use these tests to diagnose fibromyalgia. You only need them if your medical history and physical exam suggest that you might have a condition other than fibromyalgia.

Current as of: July 31, 2024

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

This information does not replace the advice of a doctor. Ignite Healthwise, LLC, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

To learn more about Ignite Healthwise, LLC, visit webmdignite.com.

© 2024-2025 Ignite Healthwise, LLC.

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