How To Put A Nasal Cannula On Correctly: A Step-by-Step Clinical Guide

Salter-Style® Nasal Cannula, Clear - Home Medix

To correctly put on a nasal cannula, insert the two prongs into the nostrils pointing downward and curving slightly inward to follow the natural anatomical slope of the nasal cavity, loop the supply tubing over and behind both ears, and slide the adjustable bolster upward under the chin until the fit is secure but comfortable. This precise alignment ensures optimal oxygen delivery between 1 to 6 liters per minute while minimizing mucosal drying, septal irritation, and skin breakdown.

Clinical Preparation and Oxygen Safety Equipment Checklist

Before initiating supplemental oxygen therapy, systematic preparation is vital to ensure patient safety, maintain aseptic conditions, and deliver the exact prescribed flow rate. Improper handling of oxygen delivery systems can lead to inadequate therapy, tissue necrosis, or severe fire hazards.

Essential Equipment & Tools

Medical-Grade Nasal Cannula: Select the appropriate size (adult, pediatric, or infant) with soft, flexible prongs and kink-resistant tubing.
Oxygen Source: A calibrated oxygen concentrator, compressed gas cylinder, or liquid oxygen system.
Flowmeter: Attached to the oxygen source to regulate flow in Liters Per Minute (LPM).
Bubble Humidifier Bottle: Filled with sterile water (strongly recommended for flow rates exceeding 4 LPM to prevent mucosal desiccation).
Water-Soluble Lubricant: Specifically formulated medical-grade lubricant (do not use petroleum-based products) to soothe nasal irritation.
Foam Cushion Protectors: Pre-cut medical-grade foam wraps to shield the skin behind the ears from pressure friction.

Mandatory Prerequisite Knowledge & Safety Standards

Prescription Verification: Always confirm the physician's prescribed oxygen flow rate (LPM) and duration before application.
The Combustion Warning: Oxygen supports combustion. Keep all delivery equipment at least 10 feet away from open flames, sparks, stoves, fireplaces, and electronic heat sources. Absolutely no smoking or vaping is permitted in the treatment area.
No Petroleum-Based Products: Never apply petroleum jelly, mineral oil, or oil-based lotions to the patient’s face, nose, or lips while using oxygen. In an oxygen-rich environment, these substances present a high risk of spontaneous combustion and can cause lipoid pneumonia if aspirated into the lungs.

Estimated Benchmarks

Preparation Time: 2 to 3 minutes.
Application Time: 1 to 2 minutes.
Therapeutic Range: Typically 1 to 6 LPM, delivering a Fraction of Inspired Oxygen (FiO2) of approximately 24% to 44%.

Step-by-Step Medical Protocol for Placing a Nasal Cannula

Following a standardized, step-by-step clinical protocol ensures the cannula remains in position, prevents oxygen leaks, and preserves skin integrity over long periods of wear.

Step 1: Perform Hand Hygiene and Verify Equipment Functionality

Wash your hands thoroughly with antimicrobial soap and warm water for at least 20 seconds, or use an alcohol-based hand sanitizer containing at least 60% alcohol. Inspect the nasal cannula packaging for any breaches in sterility or material defects. Unwrap the cannula and untangle the tubing fully. Connect the female adapter of the cannula tubing directly to the oxygen source or the humidifier bottle output port. Turn on the oxygen source and adjust the flowmeter to the exact prescribed flow rate.

Pro-Tip: Before placing the cannula on the patient, hold the nasal prongs close to the back of your hand or wrist. You should feel a gentle, cool, and continuous stream of air. If you do not feel airflow, check the tubing for kinks, verify the connections, and ensure the oxygen source is functioning.

Step 2: Orient and Position the Nasal Prongs Correctly

Hold the nasal cannula loop in front of the patient with the prongs pointing toward them. Examine the physical curve of the two prongs. The prongs must curve downward and inward toward the patient's nasal passage.

Warning: Do not insert the prongs pointing upward or curving backward. The anatomical floor of the nasal cavity slopes downward toward the throat. Placing the prongs upside down directs the oxygen stream straight at the sensitive mucosal lining of the nasal septum, leading to rapid drying, inflammation, and nosebleeds.

Step 3: Insert the Prongs Gently into the Nares

Instruct the patient to tilt their head slightly back. Gently insert the curved prongs into the nostrils (nares). The prongs should sit fully inside the nostrils, but they must not reach deep into the nasal cavity. The plastic base of the prongs should rest comfortably just beneath the nose, without pushing hard against the nasal septum or the upper lip.

Step 4: Route the Tubing Over and Behind the Ears

While holding the nasal prongs steady in the nostrils with one hand, use your other hand to split the two supply tubes. Lift the tubing on either side of the face and drape it over and behind each ear, exactly like the temples of a pair of eyeglasses. Ensure the tubing rests flat on the top of the ears (the superior auricle) and drapes down behind the earlobes. Keep the tubing smooth and flat against the cheeks to avoid twisting, which can apply uneven pressure to the skin.

Step 5: Adjust the Slide Bolster under the Chin

Locate the plastic sliding sleeve (bolster) on the tubing. Gently slide the bolster upward toward the throat, under the patient's chin. Adjust the bolster until the loop around the ears and head is secure enough to keep the cannula from slipping out of place during movement, but loose enough to prevent skin pinching.

Pro-Tip: To verify a safe and comfortable fit, attempt to slip two fingers easily between the tubing and the underside of the patient’s chin. If you cannot slide two fingers under the tubing, the bolster is too tight and can cause pressure necrosis over time.

Step 6: Perform a Post-Application Inspection and Skin Check

Verify that the patient can breathe comfortably through both their nose and mouth. Inspect all major contact points where pressure injuries commonly develop: the bridge of the nose, the tops of both ears, and the cheeks. If the patient has sensitive skin or requires continuous, long-term oxygen therapy, wrap small, medical-grade foam cushions around the tubing segments resting directly on top of the ears to distribute the pressure.

How To Put Nasal Cannula In

Nasal Cannula Technical Specifications and Flow Rate Matrix

Standard low-flow nasal cannulas operate within precise physical parameters. Exceeding recommended flow limits does not significantly increase blood oxygenation; instead, it causes severe mucosal irritation and discomfort. The following table highlights the technical thresholds for standard nasal cannula applications.

Oxygen Flow Rate (LPM)	Estimated FiO2 (%)	Primary Clinical Application	Humidification Requirement	Mucosal and Skin Impact
1 LPM	24%	Mild respiratory distress; stable chronic obstructive pulmonary disease (COPD) maintenance.	None required under standard conditions.	Very low risk of drying or irritation.
2 LPM	28%	Moderate hypoxemia; stable post-operative recovery; long-term home oxygen therapy.	Optional; recommended for pediatric patients.	Low risk; easily tolerated by most patients.
3 LPM	32%	Acute respiratory conditions; early intervention for oxygen desaturation.	Highly recommended if used continuously for >24 hours.	Moderate drying of the nasal passages.
4 LPM	36%	Moderate-to-severe hypoxemia; active pulmonary exacerbations.	Mandatory to prevent mucosal cracking and epistaxis.	High risk of mucosal desiccation and septal soreness.
5 LPM	40%	Severe respiratory compromise; transition phase to high-flow devices.	Mandatory; use high-capacity bubble humidifiers.	Very high risk of irritation, burning sensations, and skin breakdown.
6 LPM	44%	Maximum limit for low-flow cannulas; urgent therapy pending clinical reassessment.	Mandatory; monitor patient comfort continuously.	Severe drying; prone to causing nasal bleeding and high mucosal pain.

Troubleshooting Common Placement Issues and Patient Discomfort

Continuous oxygen therapy often presents physical challenges for patients. Recognizing the root causes of cannula failure allows caregivers to implement quick, clinically sound remedies.

Issue: Skin breakdown, redness, or soreness behind the ears.
- Root Cause: Excessive tension on the tubing loop caused by sliding the bolster too tight, using rigid or degraded plastic tubing, or continuous friction against the superior auricle.
- Actionable Fix: Loosen the slide bolster under the chin to allow a two-finger gap. Wrap soft foam tubing protectors around the sections of the cannula that rest on top of the ears. Alternatively, temporarily secure the tubing to the cheeks using medical-grade silicone tape to transfer the load away from the ears.
Issue: Severe nasal dryness, burning sensations, or nosebleeds (epistaxis).
- Root Cause: Flow rates exceeding 3 LPM without active humidification, or the nasal prongs pointing upward and blowing dry oxygen directly against the nasal septum.
- Actionable Fix: Verify that the prongs are curved downward and inward. Install a sterile bubble humidifier bottle onto the oxygen source. Apply a small amount of water-soluble, medical-grade nasal gel inside the nostrils to restore moisture. Never use petroleum jelly.
Issue: The cannula slips out of the nose repeatedly during sleep.
- Root Cause: The slide bolster is adjusted too loosely, or the heavy extension tubing is pulling down on the facial cannula, dislodging it during movement.
- Actionable Fix: Adjust the slide bolster under the chin to a snugger, yet comfortable position. Use a lightweight, high-flexibility cannula. Secure the main oxygen extension tubing to the patient's clothing or bedding using a specialized, non-restrictive plastic clip to take the tension off the face.
Issue: Skin irritation or "denting" along the cheeks.
- Root Cause: Tubing is twisted, or the slide bolster has been routed behind the head rather than under the chin, pressing the tubes directly into the cheek tissues.
- Actionable Fix: Untwist the cannula tubing completely before application. Always route the adjustment bolster under the chin rather than behind the head, as the chin method distributes pressure more evenly across the wider facial structures.

Frequently Asked Questions

Which way do the prongs of a nasal cannula face?

The prongs must point downward and curve slightly inward toward the nasal cavity. This orientation aligns with the natural anatomical path of your nasal passages, directing the flow of oxygen backward toward your throat rather than directly against the sensitive upper tissue of your septum.

Can I use Vaseline or petroleum jelly to soothe dry nostrils from oxygen?

No, you must never use petroleum jelly, mineral oil, or any oil-based products on your nose or lips while using oxygen therapy. Petroleum is highly flammable and can ignite spontaneously in an oxygen-rich environment; additionally, inhaling microscopic oil droplets can lead to a serious lung condition called lipoid pneumonia. Always use water-soluble gels instead.

How often should I clean or replace my nasal cannula?

For continuous home use, clean your nasal cannula once a week by washing the prongs in warm, soapy water, rinsing them thoroughly, and allowing them to air dry completely. Replace the entire nasal cannula assembly every 14 to 30 days, or immediately if the plastic becomes stiff, discolored, or after recovering from a respiratory illness.

Why does the oxygen tubing loop under my chin instead of behind my head?

Routing the tubing over the ears and securing the bolster under the chin is the standard medical placement because it provides the most stable, slip-resistant fit. It also minimizes localized pressure on the back of the skull, allows the patient to rest their head flat on a pillow comfortably, and reduces the risk of skin breakdown on the ears.

Access Professional Home Oxygen Solutions

Selecting the right respiratory equipment is essential for maintaining comfort and ensuring therapeutic success. Explore our complete selection of medical-grade nasal cannulas, ultra-soft tubing, and active humidifiers to optimize your home oxygen system today.