凝固因子:日本人ではFactor V Leiden(ライデンで見つかったためこのように呼ばれる異常第5因子)はみられないため(現時点では未報告)、V因子活性は測定する意義は薄い。むしろ日本人ではプロテインC/プロテインSについて活性異常を念頭に置かなけらばならない。コーカソイドのみに第V因子活性異常は報告されており、日本在留のコーカソイドの発症の際には留意が必要と考えられる。
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