Which of the following factors may affect the measurement of GRV?

• A. Type of feeding tube
• B. Body position
• C. Location of the tip of the feeding tube
• D. All of the above

Answer: (D)

Gastric residual volume is influenced by how the tube drains and by the patient’s position, so measurement isn’t a fixed number unless technique is standardized. The type of feeding tube matters because different designs and lumens drain differently and can be blocked or less efficient, altering how much you can aspirate. The body position affects gravity and gastric contents’ distribution, so residual volume can change when a patient is upright versus lying flat. The location of the tube tip is crucial—if the tip isn’t in the stomach (or is in an unusual spot within the stomach), the aspirated content may not reflect true gastric contents. Because these factors all impact GRV, all of the above are relevant considerations. To improve reliability, ensure proper tube placement, a consistent body position, and a consistent drainage method.