The correct measurement for sizing an oropharyngeal airway is from the center of the mouth to the angle of the jaw.

The correct measurement for sizing an oropharyngeal airway is from the center of the mouth to the angle of the jaw.

• A. Center of mouth to angle of jaw
• B. Corner of mouth to earlobe
• C. Nose to tip of chin
• D. Ear to mouth

Answer: (A)

Sizing an oropharyngeal airway uses a simple depth rule based on facial landmarks. Measure from the center of the mouth to the angle of the mandible; this distance approximates the length of the oropharynx, so the airway sits behind the tongue and into the pharynx without extending into the larynx. Using the center of the mouth as the start point gives a consistent reference across different faces and dental setups. If the device is too short, the tongue can still fall back and block the airway; if it’s too long, the tip may irritate the oropharynx or advance too far. Other landmarks like the earlobe, chin, or ear-to-mouth distance don’t reflect the actual depth of the airway and can lead to an incorrect size.

Sizing an oropharyngeal airway uses a simple depth rule based on facial landmarks. Measure from the center of the mouth to the angle of the mandible; this distance approximates the length of the oropharynx, so the airway sits behind the tongue and into the pharynx without extending into the larynx. Using the center of the mouth as the start point gives a consistent reference across different faces and dental setups. If the device is too short, the tongue can still fall back and block the airway; if it’s too long, the tip may irritate the oropharynx or advance too far. Other landmarks like the earlobe, chin, or ear-to-mouth distance don’t reflect the actual depth of the airway and can lead to an incorrect size.