Nasogastric Tube Gastric Residual Check: Step-by-Step Clinical Procedure

Checking Gastric Residual Volume (GRV)

Essential for safe enteral nutrition; assesses gastric emptying and tolerance.

Procedure (Standard Practice)

1. Verify placement per protocol (pH, X-ray, ultrasound) before each check.
2. Clamp feeding tube (if continuous feed).
3. Stop pump (if running).
4. Attach 60 mL syringe to feeding port.
5. Aspirate gently for 15–30 seconds. Do not apply excessive suction.
6. If no return: Reinstill 30 mL air (if protocol allows), wait 30 sec, re-aspirate. (Some guidelines omit air reinstillation).
7. Measure volume in syringe.
8. Assess aspirate: Color (clear, bilious, bloody, feculent), consistency, odor.
9. Return aspirate if <250 mL (or per protocol) to preserve electrolytes/enzymes; discard if >250 mL, feculent, or patient intolerant.
10. Flush tube with 10–30 mL water (per policy).
11. Restart feed per order.
12. Document: Volume, appearance, action taken, patient tolerance.

Interpretation & Action Thresholds

• < 250 mL (or < 50% of hourly rate): Continue feed; monitor trend.
• 250–500 mL: Hold 1 hour, recheck; consider prokinetic (metoclopramide, erythromycin).
• > 500 mL: Hold feed; notify provider; evaluate for ileus, obstruction, medication effects.

Frequency

• Every 4–6 hours for continuous feeds.
• Before each intermittent/bolus feed.
• Per provider order (may vary by unit/patient).

Follow your facility's evidence-based protocol; ASPEN/ASPEN guidelines recommend individualized thresholds.