The mnemonic
PAIR
What each word stands for
- PPsoriatic arthritis
- AAnkylosing spondylitis
- IInflammatory bowel disease arthritis
- RReactive arthritis
Why it matters clinically
Groups the HLA-B27 associated spondyloarthropathies that are rheumatoid factor negative.
Where it stops being reliable
HLA-B27 is supportive, not diagnostic, and not every patient with these conditions carries it.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.