Wound, Ostomy and Continence Nurses Society (WOCN) Practice Exam

What qualifies as a high output fistula?

1. Less than 500ml per 24 hours

2. 300ml per 24 hours

3. 600ml per 24 hours

4. 500ml or more per 24 hours

The correct answer is: 500ml or more per 24 hours

A high output fistula is characterized by the volume of output that is significantly higher than normal. In this context, when we refer to a fistula producing 500ml or more per 24 hours, it is classified as "high output." This definition is important for clinical management because high output can lead to fluid and electrolyte imbalances, requiring careful monitoring and specific interventions. Health care providers often need to differentiate between low and high output fistulas to determine the most appropriate treatment plan. A threshold of 500ml per day is utilized in most guidelines to help identify those patients who may need more intensive management or nutritional support due to the substantial fluid loss associated with high output.