Doctors do not use lab tests to diagnose
fibromyalgia. The results of lab tests done on people
with fibromyalgia should be normal unless another condition is present.
You may have lab tests to rule out other diseases or to find out
whether you have another disease in addition to 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, he or she may do
any of the following tests:
A complete blood count (CBC)
erythrocyte sedimentation rate (ESR) or a C-reactive protein (CRP) test to help
identify diseases that cause inflammation, such as
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