Certified Neuroscience Registered Nurse (CNRN) Practice Exam

What amount of bloody drainage via nasogastric tube (NGT) is indicative of needing to notify the surgeon?

1. 30 ml/hr

2. 75 ml/hr

3. 100 ml/hr

4. 150 ml/hr

The correct answer is: 75 ml/hr

When assessing the amount of bloody drainage from a nasogastric tube (NGT), it's important to recognize that the volume of drainage can indicate potential complications that may necessitate immediate surgical attention. A drainage volume of 75 ml/hr is significant enough to raise concern, as it suggests a more serious issue such as a possible gastrointestinal bleed or other complications that require further evaluation. In clinical practice, any consistent volume of bloody drainage from an NGT should prompt careful monitoring and consideration. While minor amounts may be expected post-operatively, particularly after surgeries involving the upper gastrointestinal tract, larger volumes are not typical and can indicate a problem. The thresholds for concern can vary based on the patient's overall status, the type of surgery performed, and the presence of accompanying symptoms. The choice of 75 ml/hr indicates a need for further investigation, as it suggests a potentially serious condition that could lead to hemodynamic instability or the requirement for surgical intervention. This volume represents a level of drainage that warrants notifying the surgeon to ensure appropriate follow-up and management.