The prevalence of p-ANCA in Thai patients with ulcerative colitis (39.4%) is lower than that in the Western population. Although the prevalence of p-ANCA is low in the Thai population, it should serve as a useful tool in diagnosing ulcerative colitis in this part of the world where the disease is uncommon and difficult to diagnose. The negativity of p-ANCA in almost all first-degree relatives of Thai ulcerative colitis patients should be further elucidated.
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