Still's disease is a rare, but potentially serious, autoimmune disorder that affects the joints and other organs. The diagnosis of Still's disease is made based on a combination of clinical symptoms, laboratory tests, and imaging studies. Blood tests are an important part of the diagnostic process and can help to rule out other conditions that may have similar symptoms.
Common Blood Tests for Still's Disease
The most common blood tests used to diagnose Still's disease are complete blood count (CBC) and erythrocyte sedimentation rate (ESR). The CBC will measure the number of different types of cells in the blood, including red blood cells, white blood cells, and platelets. The ESR measures how quickly red blood cells settle out of a sample of blood. Elevated levels of certain white blood cells, called neutrophils, and an elevated ESR are both associated with Still's disease.
Other Tests
In addition to the CBC and ESR, other tests may be used to diagnose Still's disease. These include tests for antinuclear antibodies (ANA), rheumatoid factor (RF), and C-reactive protein (CRP). ANA is an antibody that is produced in response to an infection or inflammation; a positive ANA test is associated with autoimmune disorders, including Still's disease. RF is an antibody that is found in some people with autoimmune disorders, such as rheumatoid arthritis; a positive RF test can indicate the presence of an autoimmune disorder. CRP is a protein produced by the body in response to inflammation; elevated levels of CRP can be a sign of inflammation in the body, which can be caused by Still's disease.
Conclusion
Blood tests are an important part of the diagnostic process for Still's disease. The most common tests used are the CBC and ESR, but other tests, such as those for ANA, RF, and CRP, may also be used. If you think you may have Still's disease, speak to your doctor about which tests may be appropriate for you.