B27 positivity indicates a possible link to ankylosing spondylitis.
The full name of B27 is HLA-B27, and the scientific name is human leukocyte antigen B27. HLA-B27 antigen expression is highly associated with ankylosing spondylitis, and the majority of patients with ankylosing spondylitis are positive for HLA-B27 antigen expression.
The clinical manifestations of ankylosing spondylitis are similar to those of many diseases, making it difficult to diagnose, and the presence of HLA-B27 is important in the diagnosis of this disease. Generally speaking, when lumbosacral pain is manifested and X-ray suggests sacroiliac arthritis, ankylosing spondylitis should be highly suspected, and HLA-B27 should be tested routinely at this time.
However, it should be noted that some patients’ HLA-B27 test results are negative, so the diagnosis of this disease should be a comprehensive judgment, and after diagnosis, we should cooperate with the doctor to determine the treatment plan and carry out active treatment.