How to Reposition an NG Tube
If an NG tube becomes dislodged or malpositioned, it should be removed and a new tube inserted rather than attempting to reposition the existing tube, followed by mandatory radiographic confirmation before use. 1
The Standard Approach: Remove and Replace
The multidisciplinary guidelines from the Society of Interventional Radiology and American Gastroenterological Association are clear about NG tube placement technique but notably do not describe repositioning of existing tubes 1. This omission is clinically significant—the standard of care is removal and replacement, not repositioning.
Why Not Reposition?
- Blind repositioning carries the same risks as initial placement without the benefit of a fresh, properly lubricated tube
- Radiographic confirmation is mandatory after any placement or repositioning anyway 1
- Malpositioned tubes can be in dangerous locations (lung, pleural cavity, coiled in esophagus) that make manipulation hazardous 1
- Between 40-80% of NG tubes become dislodged, making this a common occurrence requiring a reliable protocol 1
The Replacement Technique
When an NG tube needs repositioning, follow this algorithm:
Step 1: Remove the Existing Tube
- Remove the tube completely
- Do not attempt to advance or withdraw a malpositioned tube blindly
Step 2: Insert a New Tube Using Standard Technique
- Use an 8-12F tube after lubrication 1
- Flex the patient's head during insertion 1
- Have the patient ingest sips of water to assist passage into the stomach 1
- Advance the tube to the appropriate depth
Step 3: Confirm Placement with Radiography
This step is non-negotiable. 1
- Never rely on auscultation alone—it is misleading and can misinterpret tubes in the lung, pleural cavity, or coiled esophagus as properly positioned 1
- Do not use bedside auscultation as confirmation despite its common use 1
- Obtain chest/abdominal radiograph before initiating feeding or medication administration 1
- Research confirms that auscultation has only 96% sensitivity but 17% specificity, while pH testing and aspiration are similarly unreliable 2, 3
Critical Safety Points
Common Pitfalls to Avoid:
- Never assume correct position based on auscultation 1, 2
- Never feed through an unconfirmed tube—even if you can palpate it intra-abdominally during surgery, this doesn't guarantee gastric placement 4
- Never attempt to advance a partially dislodged tube without removing it first
- Aspiration of gastric contents is helpful when positive (pH ≤5), but absence of aspirate doesn't confirm malposition 2, 5
For Ongoing Monitoring After Confirmed Placement:
Once radiographically confirmed 6, 7:
- Mark the tube with indelible ink or adhesive tape where it exits the nares 7
- Check tube location at 4-hour intervals 7
- Verify placement before each feeding in patients who complain of pain, vomiting, or coughing 7
When Endoscopic or Fluoroscopic Guidance Is Needed
If blind bedside placement repeatedly fails or the patient has anatomical abnormalities, consider 1, 6:
- Endoscopic guidance for difficult placements
- Fluoroscopic guidance as an alternative
- Electromagnetic tracking devices for improved success rates in postpyloric placement 6
The evidence consistently demonstrates that radiography remains the gold standard for confirming NG tube placement 2, 5, 3, and no bedside technique—alone or in combination—eliminates the need for radiographic confirmation 2.