HLA-B27, FLOW CYTOMETRY

The HLA-B27 Test by Flow Cytometry is a specialized laboratory test used to detect the presence of the Human Leukocyte Antigen B27 (HLA-B27) on the surface of white blood cells. HLA-B27 is a genetic marker that is strongly associated with several autoimmune and inflammatory disorders, particularly a group of conditions known as spondyloarthropathies.

Flow cytometry is a rapid and highly sensitive technique that identifies HLA-B27-positive cells by analyzing specific cell surface markers. The test helps physicians assess the likelihood of certain rheumatological diseases when symptoms and clinical findings suggest an inflammatory condition.

The presence of HLA-B27 does not confirm a disease diagnosis by itself. However, individuals who test positive for HLA-B27 have a higher risk of developing conditions such as Ankylosing Spondylitis, Reactive Arthritis, Psoriatic Arthritis, and certain forms of Inflammatory Bowel Disease-associated Arthritis.

Benefits of the Test

• Detects HLA-B27 antigen accurately
• Supports diagnosis of ankylosing spondylitis
• Assists in evaluating inflammatory arthritis
• Helps identify genetic predisposition to autoimmune disorders
• Provides rapid and reliable results through flow cytometry
• Supports rheumatological disease assessment

Why Doctors Recommend This Test

Doctors may recommend HLA-B27 Flow Cytometry testing for:

• Chronic lower back pain
• Suspected Ankylosing Spondylitis
• Reactive Arthritis evaluation
• Psoriatic Arthritis assessment
• Inflammatory joint pain
• Recurrent eye inflammation (uveitis)
• Family history of spondyloarthropathies
• Investigation of unexplained inflammatory symptoms

The test helps support diagnosis when clinical signs and symptoms suggest an HLA-B27-associated disorder.

Preparation Before Test

The test requires:

• Peripheral venous blood sample

Preparation generally includes:

• No fasting is required
• Continue medications unless advised otherwise by your doctor
• Inform your physician about current medical conditions
• Follow laboratory instructions for sample collection

The sample is analyzed using flow cytometry technology to detect HLA-B27 expression.

Normal Reporting Time

Results are generally available within 1 to 3 working days, depending on laboratory workflow.

Who Should Take This Test?

• Individuals with chronic inflammatory back pain
• Patients with suspected ankylosing spondylitis
• Individuals with unexplained arthritis
• Patients with recurrent uveitis
• Individuals with a family history of HLA-B27-associated disorders
• Patients referred by rheumatologists, orthopedic specialists, or physicians

The HLA-B27 Flow Cytometry test is an important tool in rheumatology and autoimmune disease evaluation.

Clinical Significance

A positive HLA-B27 result may be associated with:

• Ankylosing Spondylitis
• Reactive Arthritis
• Psoriatic Arthritis
• Enteropathic Arthritis
• Acute Anterior Uveitis
• Undifferentiated Spondyloarthritis

However, many healthy individuals may also carry HLA-B27 without developing disease. Therefore, test results must always be interpreted alongside clinical symptoms and other investigations.

Important Note

A positive HLA-B27 result does not establish a diagnosis, and a negative result does not completely exclude disease. Clinical evaluation, imaging studies, inflammatory markers, and rheumatological assessment remain essential for accurate diagnosis.