The HLA B27 test is a blood test used to detect the presence of a genetic marker that may indicate a predisposition to certain autoimmune diseases. HLA stands for human leukocyte antigen (HLA) and plays an important role in regulating the body's immune system. HLA B27 is a subtype of this antigen and is found in the genetic makeup of some people.

The presence of HLA B27 may be associated with several autoimmune diseases that cause the immune system to attack its own tissues. These diseases include ankylosing spondylitis, reactive arthritis, psoriatic arthritis, and uveitis.

The HLA B27 test is often ordered by doctors for patients with specific symptoms. These symptoms include long-term back pain, joint stiffness, swelling, eye pain, and swelling. The primary purpose of the test is to diagnose conditions such as ankylosing spondylitis, reactive arthritis, psoriatic arthritis, and uveitis.

1. Ankylosing Spondylitis: This chronic disease causes inflammation of the spine and sacroiliac joints. This disease is more common in individuals who are HLA B27 positive.
2. Reactive arthritis: This is an inflammatory disease that develops after infection and usually affects the joints. The presence of HLA B27 may be closely associated with this condition.
3. Psoriatic Arthritis: HLA B27 positivity may be an important marker in this disease, which occurs with inflammation of the joints in individuals with psoriasis.
4. Uveitis: This inflammatory condition, which causes swelling and pain in the eye, may be associated with HLA B27.

How is the HLA B27 Test Performed?

How long does the HLA B27 test take? The HLA B27 test is performed by simply drawing a blood sample. The sample is sent to a laboratory, where specialized tests are performed to detect the presence of HLA B27. Results are usually available within a few days. While no special preparation is required for the test, in some cases your doctor may give you specific instructions. It is extremely important to follow these instructions before the test.

The result of the HLA B27 test can be either positive or negative:

• A positive result: The HLA B27 genetic marker is present in your body. This means you may have an increased risk of developing the diseases mentioned above, but it doesn't necessarily mean you have them.
• A negative result indicates that you don't have HLA B27. This indicates that you have a lower risk of developing the disease, but it doesn't guarantee that you're completely free of risk.

Why is the HLA B27 Test Performed?

The HLA B27 test is performed to assess the risk of ankylosing spondylitis in individuals experiencing low back, hip, or hip pain that is typically worse in the morning and lasts longer than three months. Additionally, this test can be used to diagnose conditions such as reactive arthritis, rheumatoid arthritis, and uveitis.

HLA B27 testing is evaluated together with additional tests and imaging methods such as Anti-cyclic citrullinated peptide (CCP) antibody, C-reactive protein ( CRP ), Erythrocyte sedimentation rate (ESR), Rheumatoid factor (RF), and X-ray imaging (X-ray), if needed.

Reasons for this test include joint pain, swelling in the spine, neck, or chest, inflammation in the joints or urinary tract, and recurring eye infections. The HLA B27 test plays a crucial role in ensuring an accurate diagnosis and appropriate treatment plan.

Limitations of HLA B27 Testing

The HLA B27 test is only a marker and does not provide a definitive diagnosis. While a positive result may increase your risk of developing an autoimmune disease, there's no guarantee that this risk will occur. Similarly, a negative result doesn't necessarily mean you're completely at risk.

The results of this test are often evaluated in conjunction with the patient's symptoms, physical examination findings, and other diagnostic tests. Therefore, regardless of the test result, it is crucial to have it reviewed by a qualified physician.

Who Should Have This Test Done?

HLA B27 testing is typically used in individuals who:

• Persistent and long-term back pain
• Swelling, pain and limitation of movement in joints
• Sudden and severe pain and swelling in the eye
• Having a family history of autoimmune disease

The HLA B27 test is an important tool for understanding your predisposition to certain serious autoimmune diseases. However, the results of this test alone are not sufficient to diagnose a disease. A specialist physician in the field analyzes the test results in detail to make a diagnosis. If you exhibit the symptoms mentioned above, the specialist physicians at Özel Magnet Hospital will evaluate your HLA B27 test results and provide the most accurate diagnosis. Contact us now and take a significant step towards your health.