Ostomy Management Specialist (OMS) Certification Practice Exam

What defines an internal fistula?

Internal - opens between two internal organs or hollow spaces External - opens to skin or an end organ A fistula that drains externally A fistula that connects to skin only

Correct Answer:

Internal - opens between two internal organs or hollow spaces

Explanation:

An internal fistula is an abnormal tract that links two internal organs or hollow spaces within the body, with no opening to the skin or outside surface. This means the drainage or passage stays entirely inside the body, connecting lumens such as bowel to bowel, bowel to bladder, or bowel to vagina. In contrast, fistulas that open to the skin or outside the body are external fistulas, because they create a pathway from an internal site to the exterior. A fistula that drains externally or one that connects to skin only would not be considered internal.

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