An orogastric tube is a thin, soft, flexible tube inserted through the mouth, down the throat, through the esophagus, and into the stomach. It delivers liquids, nutrition, or medication directly to the stomach, and it can also be used to drain stomach contents. You’ll most commonly encounter orogastric tubes in intensive care settings, particularly in newborn units and during emergency care, where they serve as a critical lifeline for patients who can’t eat or swallow on their own.
How It Differs From a Nasogastric Tube
The key distinction is the entry point. A nasogastric tube goes through the nose, while an orogastric tube goes through the mouth. Both end up in the same place: the stomach. But the route matters more than you might think, because certain medical situations make the nasal path dangerous or impractical.
Orogastric tubes are preferred when a patient has significant facial trauma, a basilar skull fracture, or has had recent nasal, throat, or esophageal surgery. In these cases, threading a tube through the nose could worsen existing tissue damage or, in rare cases involving skull fractures, allow the tube to enter the brain cavity. Blockages in the esophagus, such as a tumor or swallowed object, also rule out tube placement through either route.
Patients on mechanical ventilation (breathing machines) also commonly receive orogastric rather than nasogastric tubes. The breathing tube already occupies much of the airway, and adding a nasal tube can increase discomfort and sinus complications.
Why Newborns Often Get Orogastric Tubes
Neonatal intensive care units rely heavily on orogastric tubes, and the reason is simple: newborns are obligate nasal breathers. They breathe almost exclusively through their noses for the first several months of life, so placing a tube through a nostril can obstruct their airway and cause breathing difficulty. This is especially true for premature infants, whose nasal passages are tiny.
Orogastric tubes are the go-to choice when a baby is on CPAP (a type of breathing support delivered through the nose), on high-flow oxygen, or showing any signs of respiratory distress. They’re also used when a baby has nasal trauma, facial abnormalities, or a condition called choanal atresia, where the nasal passages are blocked from birth.
Tube size in neonates is based on weight. Babies under 500 grams or younger than 26 weeks gestational age receive the smallest available tube (size 4 French, a unit measuring the tube’s outer diameter). Babies between 500 and 1,500 grams typically use a size 5 or 6, while those over 1,500 grams use a size 6 or 8.
How the Tube Is Placed
Before insertion, a clinician measures the tube length needed to reach the stomach. For orogastric tubes in neonates, one common measurement technique starts at the corner of the mouth, stretches to the bottom of the earlobe, and continues to the midpoint between the bottom of the breastbone and the belly button. A weight-based formula is also used in newborns: the tube length in centimeters equals three times the baby’s weight in kilograms, plus 12. For older children, age-specific formulas that factor in height provide more accurate measurements.
The tube tip is lubricated with water-based gel. In awake patients, the clinician explains each step before proceeding. The patient sits upright when possible, and the tube is gently guided through the center of the mouth and down the back of the throat. If the patient is able to cooperate, they’re asked to tilt their chin slightly and swallow as the tube advances, which helps direct it into the esophagus rather than the airway. For intubated patients (those already on a breathing machine), a laryngoscope may be used to visualize placement.
If the patient coughs, gags excessively, turns blue, or shows a drop in oxygen levels during insertion, the tube is pulled back immediately. These signs can indicate the tube has entered the airway instead of the esophagus.
Confirming the Tube Is in the Right Place
Correct placement is essential. A tube that ends up in the lungs instead of the stomach can cause serious harm, including aspiration (fluid entering the airways) or even a collapsed lung. The gold standard for confirming placement is an X-ray, which shows exactly where the tube tip sits.
However, X-rays aren’t always practical, especially when a tube needs to be checked multiple times. Repeated radiation exposure is a real concern, particularly for premature infants. So clinicians also use bedside methods. The most common alternative is pH testing: a small amount of fluid is drawn from the tube, and if it’s acidic (typical of stomach contents), that’s a reassuring sign. Another method involves listening with a stethoscope over the stomach while pushing a small burst of air through the tube, though this technique is less reliable on its own. Newer approaches like bedside ultrasound are gaining traction as a radiation-free option.
Ongoing Care and Monitoring
Once placed, the tube is secured to the cheek with medical tape or a fixation device. In premature babies, whose skin is extremely fragile, a protective dressing is applied to the skin first to prevent breakdown from the adhesive. The insertion site and surrounding skin need daily assessment for redness, swelling, or pressure damage.
Clinicians regularly check that the tube hasn’t shifted by tracing its path from the mouth and confirming the external length markings haven’t changed. They also look inside the mouth to ensure the tube runs straight down rather than curling back on itself.
For patients receiving tube feedings, stomach contents are periodically drawn back through the tube using a syringe to measure what’s called gastric residual volume. This tells the care team how well the stomach is emptying. Residual volumes between 200 and 500 mL raise concern and may prompt adjustments like slowing the feeding rate. Current evidence suggests that feedings shouldn’t be stopped for residual volumes under 500 mL unless other signs of intolerance (like vomiting or abdominal distension) are present, because interrupting nutrition can set back a patient’s recovery.
Potential Complications
Complications from orogastric tubes are uncommon, but when they occur, they can be serious. The most widely recognized risk is malplacement, where the tube enters the airway instead of the esophagus. This is why verification after every insertion is non-negotiable.
Other possible complications include:
- Aspiration: stomach contents flowing backward into the lungs, particularly if the tube dislodges or the patient is lying flat
- Esophageal perforation: a rare but dangerous tear in the esophagus, most associated with blind insertion technique. About 70% of all esophageal perforations are caused by medical instruments, though this includes all types of tubes and scopes, not just orogastric tubes.
- Tube knotting: the tube can loop or knot inside the body, making removal difficult
- Oral and throat irritation: prolonged use can cause soreness, gagging, or minor tissue damage around the mouth
Because orogastric tubes pass through the mouth, they can also trigger a stronger gag reflex compared to nasogastric tubes. This makes them less practical for patients who are awake and alert for extended periods, which is one reason nasogastric tubes are more common for longer-term use in conscious patients.
When the Tube Comes Out
An orogastric tube is removed once the underlying reason for it has resolved. For a newborn, that typically means the baby has developed enough oral feeding skills (sucking, swallowing, and coordinating breathing) to take adequate nutrition by mouth. For an adult in the ICU, removal usually follows successful weaning from a ventilator or the return of normal swallowing function. If long-term tube feeding is still needed after the acute phase, the care team may transition to a nasogastric tube or a more permanent option like a surgically placed stomach tube.
Removal itself is straightforward. The tube is gently withdrawn in one smooth motion while the patient is positioned upright to minimize the chance of any residual stomach contents entering the airway. The whole process takes only a few seconds.