Yes, a blood test can be used to diagnose ankylosing spondylitis. Ankylosing spondylitis is an inflammatory type of arthritis that affects the spine and other parts of the body, such as the eyes, lungs, and heart. Blood tests can be used to measure levels of inflammation and to identify antibodies associated with the condition.
The most common blood test used to diagnose ankylosing spondylitis is the erythrocyte sedimentation rate (ESR). This test measures the rate at which red blood cells settle in a test tube. If the rate is higher than normal, it can be an indication of inflammation in the body. Another common test is the C-reactive protein (CRP) test, which measures the level of protein in the blood that is a marker of inflammation.
In addition, blood tests can be used to detect antibodies associated with ankylosing spondylitis. These antibodies, called HLA-B27, are found in over 90 percent of people with the condition. If someone has a positive HLA-B27 test, it is a strong indication that they have ankylosing spondylitis.
Finally, a blood test can also be used to rule out other potential causes of back pain or stiffness. By ruling out other potential causes, the diagnosis of ankylosing spondylitis can be confirmed.
In conclusion, a blood test can be used to diagnose ankylosing spondylitis. The most common tests measure levels of inflammation and identify antibodies associated with the condition. Additionally, a blood test can be used to rule out other potential causes of back pain or stiffness.