Nasogastric (NG) tube feeding provides nutritional support directly to the stomach via a flexible tube passed through the nasopharynx. It serves patients with a functional gastrointestinal tract who cannot take adequate nutrients orally.
Preparation before inserting an NG tube ensures patient safety and procedural success. Begin by verifying the medical order and assessing the patient's nasal passages for septal deviation, polyps, or trauma. Check bowel sounds and abdominal distension.
Gather the necessary equipment at the bedside:
Insert the NG tube with the patient in a high Fowler's position to reduce aspiration risk. Measure the correct insertion length using the NEX method: measure from the Nose tip to the Earlobe, then down to the Xiphiid process. Mark this length with tape or note the centimeter markings.
Lubricate the distal 5 to 10 cm of the tube with water-soluble jelly. Instruct the patient to tilt their head slightly hyperextended as you gently pass the tube through the nostril aiming downward and backward. Once the tube reaches the nasopharynx, ask the patient to flex their head forward and swallow small sips of water to advance the tube down the esophagus with each swallow. Stop immediately and withdraw the tube if the patient experiences severe respiratory distress, cyanosis, or significant coughing.
Verifying correct tube placement before every feed or medication administration prevents pulmonary aspiration of nutritional formulas.
*A common misconception*: Auscultation—injecting air through the tube while listening over the epigastrium with a stethoscope—is unreliable and no longer recommended as a primary verification method because air sounds similar over the lungs, pharynx, and stomach.
Enteral feedings can be given intermittently using a gravity bag or continuous infusion via an electronic pump. Always check gastric residual volume (GRV) before intermittent feedings; large residuals (usually over 250 to 500 mL depending on facility protocol) indicate delayed gastric emptying.
Keep the head of the bed elevated at least 30 to 45 degrees during feeding and for 30 to 60 minutes afterward to prevent aspiration. Flush the tube with 30 mL of sterile or warm tap water before and after feedings, and after medication administration, to maintain patency and prevent clogging.
Continuous care minimizes the risk of local tissue damage and systemic complications associated with enteral tubes.
Accurate documentation ensures continuity of care and legal protection. Record the date and time of insertion, tube size and type, verification method used, patient tolerance, and the external length marking at the nostril.
Remove the NG tube when the patient resumes adequate oral intake or the tube is no longer needed. Explain the procedure, place a waterproof pad on the chest, clamp or kink the tube, ask the patient to take a deep breath and hold it, and smoothly withdraw the tube. Clean the nose and mouth, document the removal time, and note the condition of the removed tube.