Fecal Occult blood test Every year to detect hidden blood in the stool, a possible sign of colon cancer.
粪便潜血检验每年一次，以检查粪便中是否潜血，粪便潜血是结肠癌的可能征兆。
Many other conditions can cause occult blood in the stool.
许多其他条件可能会导致有潜血出现在粪便中。
Many other conditions can cause occult blood in the stool.
许多其他条件可能会导致有潜血出现在粪便中。
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