Ultrasonography-Guided Nasogastric Tube Placement and Verification: A Standardized Nursing Protocol
April 7th, 2026
Ultrasonography provides a safe, radiation-free, bedside method for real-time verification of nasogastric tubes. This evidence-based nursing protocol standardizes indications, acquisition, interpretation, and decision-making, supporting timely gastric access and demonstrating nurses’ capacity to achieve high diagnostic accuracy.
Our study investigates whether nurse-led ultrasound provide a safe, rapid, reliable method for very fine nasogastric tube placement. Existing methods may be delayed, indirect, or radiation dependent. This protocol standardizes bedside ultrasound verification for safer nursing preps.
To begin, turn on the ultrasound device and select the appropriate presets. For cervical esophageal imaging, select the soft tissues or neck preset, and use a high frequency linear transducer, typically six to 13 megahertz. For epigastric scanning of the gastric antrum, select the abdominal preset and use a low-frequency convex transducer, typically two to five megahertz.
Place the patient in a supine position. For cervical scanning, ensure the head is in a neutral or slightly extended posture to elongate the anterior neck and optimize esophageal visualization. For epigastric scanning, ensure the upper abdomen is exposed from the xiphoid process to the left costal margin.
Determine the estimated insertion depth of the nasogastric tube using a standardized external measurement method consistent with institutional policy before ultrasound confirmation. Use the nose-ear xiphoid or nose-ear mid-umbilicus technique. Mark the selected measurement on the tube before insertion to guide advancement to the estimated gastric position.
Perform ultrasound scanning during tube advancement and/or immediately after reaching the predetermined insertion depth. Apply an adequate amount of ultrasound gel to the linear transducer to avoid air interference and ensure proper acoustic coupling. Place the probe transversely on the neck, just superior to the suprasternal notch and lateral to the trachea at the level of the cricoid cartilage.
Ensure the probe marker corresponds to the left side of the ultrasound screen. To identify the trachea, locate a hyperechoic anterior wall with posterior acoustic shadowing. Then identify the esophagus as a compressible structure, typically posterior and slightly left of the trachea, that may appear hypoechoic unless distended.
Next, identify the carotid artery and internal jugular vein as lateral reference points to confirm orientation. Adjust the ultrasound settings to improve visualization of the esophageal lumen by setting the depth to three to five centimeters for cervical structures. Set the gain to a moderate level to avoid saturation that obscures hyperechoic tube patterns.
Optimize the focus to enhance image sharpness. During nasogastric tube insertion, maintain real-time visualization of the advancing tube. Observe the appearance of a hyperechoic linear structure within the esophagus.
Instruct a cooperative patient to swallow during tube advancement to enhance esophageal peristalsis and facilitate identification of the characteristic ultrasonographic flash artifact associated with esophageal page. Select the convex transducer, and apply an adequate amount of gel. Position the probe in a longitudinal orientation over the epigastric or subxiphoid region with the probe marker directed toward the patient's head.
Identify the left lobe of the liver as the anterior acoustic window. Then identify the gastric antrum posterior to the liver. Confirm the presence of the aorta and the superior mesenteric artery as posterior structures relative to the gastric antrum.
Observe for the appearance of a hyperechoic linear or double-line structure within the gastric antrum. Optionally, inject 10 to 20 milliliters of air rapidly through the tube using a syringe while maintaining real-time ultrasound visualization of the gastric antrum. Observe the gastric lumen for brief turbulent echogenicity or dynamic fogging, seen as a transient hyperechoic cloud or swirling artifact, immediately after air injection.
If no turbulence is observed, reassess probe positioning and repeat the maneuver once. Press freeze and capture representative images once optimal visualization is achieved. Capture images of the tube within the esophagus and within the gastric antrum in a longitudinal view.
Label the images according to institutional and research standards. Save the captured images in the patient record. In successful examinations, the nasogastric tube was clearly visualized in the cervical esophageal window as a hyperechoic linear or double-line structure within the esophageal lumen posterior and slightly lateral to the trachea.
Correct gastric placement was confirmed by direct visualization of the nasogastric tube within the gastric antrum, posterior to the left lobe of the liver. In inadequate examinations, neither direct nor indirect signs of the nasogastric tube placement could be reliably identified. This protocol enables measurement of ultrasound accuracy verification time, visibility, reproductibility, safety and nursing implementation outcomes.
The key challenge is obtaining clear cervical and epigastric images. Inconclusive findings require radiographic confirmation. Additional analysis may compare findings with gastric aspirate pH testing and a chest x-ray.
The reference is standard for a nasogastric tube verification.
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Overview
This protocol outlines a standardized, evidence-based nursing approach for ultrasonography-guided nasogastric tube (NGT) placement and verification in adult patients. Developed from a comprehensive review of 29 studies, the method emphasizes the use of point-of-care ultrasonography (PoCUS) as a safe, rapid, and radiation-free alternative to traditional chest radiography for confirming NGT placement. The protocol details technical procedures and decision-making strategies to enhance patient safety and streamline clinical workflows.
Key Study Components
Area of Science
- Nursing
- Clinical ultrasonography
- Gastroenterology
Background
- Nasogastric tube placement is a common procedure in adult patient care, especially for critically ill or nutritionally vulnerable populations.
- Chest radiography is the conventional reference standard for NGT confirmation but can cause delays and exposes patients to radiation.
- Point-of-care ultrasonography (PoCUS) offers real-time, radiation-free visualization of NGT placement.
- There is a need for standardized, evidence-based protocols to guide nursing practice in this area.
Purpose of Study
- To present a standardized protocol for ultrasonography-guided NGT placement and verification in adults.
- To synthesize evidence from 29 studies on clinical indications, technical procedures, and decision-making for PoCUS in NGT confirmation.
- To support broader adoption of PoCUS and expand nursing autonomy in gastric access verification.
Methods Used
- Scoping review of 29 published studies on ultrasonography-guided NGT placement and verification.
- Development of a protocol detailing patient positioning, sonographic window selection, and transducer choice (linear and convex).
- Integration of direct (hyperechoic tube identification) and indirect (dynamic fogging) ultrasonographic verification techniques.
Main Results
- Ultrasonography is consistently safe, rapid, and effective for real-time NGT visualization in the esophagus and stomach.
- Ultrasound reduces delays in confirming NGT placement and initiating enteral nutrition compared to chest radiography.
- The protocol provides clear guidance on technical components and verification strategies for nursing practice.
Conclusions
- Ultrasonography-guided NGT placement enhances patient safety and reduces reliance on radiography.
- The standardized protocol supports consistent clinical practice and empowers nurses in gastric access verification.
- Broader adoption of PoCUS can improve outcomes for critically ill and nutritionally vulnerable patients.
Frequently Asked Questions
Executive Industry Relevance
Standardized ultrasonography-guided nasogastric tube (NGT) placement protocols address critical workflow bottlenecks in clinical research and translational care settings. By enabling rapid, radiation-free confirmation of gastric access, this approach reduces procedural delays and enhances patient safety, particularly in vulnerable populations. The protocol's evidence-based structure supports reproducibility and cross-site standardization, aligning with enterprise-level quality and operational goals.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Facilitates reliable gastric access in preclinical and translational models requiring enteral interventions.
- Reduces confounding variables by standardizing tube placement verification across studies.
- Supports mechanistic de-risking by minimizing procedural variability in intervention delivery.
Screening & Assay Development
- Enables consistent preparation of animal or clinical models for downstream pharmacological or nutritional studies.
- Improves assay reproducibility by ensuring accurate and timely NGT placement confirmation.
- Supports scalable workflows by reducing reliance on radiographic infrastructure.
Translational & Preclinical Research
- Aligns with disease-relevant protocols for critically ill or nutritionally compromised models.
- Enhances continuity from discovery through preclinical validation by standardizing access procedures.
- Reduces risk of procedural delays impacting study endpoints or biomarker collection.
Pipeline & Workflow Integration
This protocol integrates into the discovery-to-preclinical continuum by providing a validated, reproducible method for NGT placement and verification. It supports both early-stage hypothesis testing and late-stage translational studies where enteral access is required.
- Discovery Biology: Standardizes intervention delivery, reducing biological variability in model systems.
- Screening: Ensures readiness for compound administration or nutritional studies by confirming tube placement rapidly.
- Analytics: Provides objective, real-time verification outputs to support data integrity.
- Translational Research: Facilitates protocol harmonization across preclinical and clinical settings.
- Enterprise Reuse: Offers a scalable, radiation-free verification capability adaptable to diverse research environments.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence by minimizing procedural errors in gastric access.
- Operational Value: Streamlines workflows and reduces dependency on radiology resources.
- Strategic Value: Enables faster go/no-go decisions by accelerating intervention readiness.
- Portfolio Impact: Supports risk-adjusted advancement by standardizing a critical procedural step across studies.
Implementation Considerations
- Requires operator proficiency in point-of-care ultrasonography techniques.
- Needs access to linear and convex ultrasound transducers and compatible imaging systems.
- Demands protocol adherence and cross-team training for reproducibility.
- Adaptable to both clinical and preclinical model systems with appropriate validation.
- May be limited by patient or model-specific anatomical factors affecting sonographic visualization.