Current thinking on gastric residual volume
Gastric residual volume (GRV) is the amount of fluid aspirated from the stomach through a feeding tube. It was long used to judge whether a client was tolerating tube feeding. GRV does not reliably predict aspiration, and routine checks are no longer recommended; where a unit still measures it, feeding is not held for a volume below 500 mL unless there are other signs of intolerance. This client's GRV is 320 mL, his abdomen is soft and not distended, he has no nausea or vomiting, and the tube mark is unchanged at 60 cm. The nurse continues the feeding at the current rate.
Applying the unit protocol
The unit's protocol holds feeding only for a GRV of 500 mL or more, or for vomiting or abdominal distension. None of these criteria is met. The unchanged external mark shows the tube has not moved since its position was confirmed by X-ray. All findings therefore support safe continuation.
| Finding | This client | Hold criterion met? |
|---|
| GRV | 320 mL | No (threshold 500 mL) |
| Vomiting | None | No |
| Abdominal distension | Soft, not distended | No |
| Tube mark | 60 cm, unchanged | No sign of displacement |
Why holding or reducing is harmful
Older cut-offs of 100 to 250 mL are outdated. Holding feedings for moderate residuals interrupts nutrition without reducing aspiration, and clients who have had major head and neck surgery need adequate protein and calories for wound healing. Holding and rechecking in 1 hour, halving the rate, and stopping the feeding all reduce delivered nutrition without a clinical reason. Stopping is reserved for vomiting, distension, or signs of aspiration.
Watch out! A residual of 320 mL can look large if you remember older textbooks. Use the threshold given in the stem and look at the whole client: abdomen, nausea, vomiting, and tube position.
Reducing aspiration risk
Other measures do more to prevent aspiration than GRV checks: keeping the head of the bed raised at 30–45°, checking tube position by the external mark at regular intervals, and watching for coughing, vomiting, or breathing changes. The aspirated residual is usually returned to the client to avoid losing fluid and electrolytes, according to policy. Key point! Do not hold tube feeding for a residual below 500 mL when there are no signs of intolerance; assess the whole client.