As of my knowledge cutoff date in 2021, there was no single blood test for fibromyalgia.
Fibromyalgia is a complex and often difficult-to-diagnose condition that is typically diagnosed based on a combination of clinical symptoms, medical history, and physical examination. There is no definitive diagnostic test for fibromyalgia.
However, some research has suggested that certain blood tests may be helpful in supporting a diagnosis of fibromyalgia or ruling out other conditions that can cause similar symptoms. For example, a study published in the journal PLoS ONE in 2015 identified several biomarkers that were found to be differentially expressed in the blood of people with fibromyalgia compared to healthy controls.
Some of the biomarkers identified in that study included cytokines (proteins that play a role in inflammation and immune function), neuropeptides (molecules involved in nerve signaling), and metabolites (small molecules involved in cellular processes). However, more research is needed to determine whether these biomarkers can be used to develop a reliable blood test for fibromyalgia.
It is important to note that the diagnosis of fibromyalgia is based on a combination of factors, and a blood test alone is unlikely to provide a definitive diagnosis. If you are experiencing symptoms of fibromyalgia, it is important to consult with a healthcare professional who can evaluate your symptoms and help determine the best course of treatment.