To select the proper size of an oropharyngeal airway, you should measure from the:

To select the proper size of an oropharyngeal airway, you should measure from the:

• A. Corner of the mouth to the nose
• B. Corner of the mouth to the earlobe
• C. Nose to earlobe
• D. Ear to jawline

Answer: (C)

Sizing an oropharyngeal airway is about matching the device length to how deep the tongue and pharynx extend in the throat, so the airway sits behind the tongue without going too far. Using a quick external measurement helps pick a size that keeps the airway open safely. Measuring from the nose to the earlobe gives a practical estimate of that depth—the distance the airway needs to reach into the oropharynx to clear the tongue and hold the airway open. If the device is too long, it can push toward the larynx or cause discomfort and gagging; if it’s too short, the tongue can still block the airway. The nose-to-ear landmark is chosen because it correlates with the depth of the oropharynx in adults, providing a reliable, easily identified reference. Other landmarks might not line up with the actual insertion depth and could lead to under- or over-insertion.

Sizing an oropharyngeal airway is about matching the device length to how deep the tongue and pharynx extend in the throat, so the airway sits behind the tongue without going too far. Using a quick external measurement helps pick a size that keeps the airway open safely. Measuring from the nose to the earlobe gives a practical estimate of that depth—the distance the airway needs to reach into the oropharynx to clear the tongue and hold the airway open. If the device is too long, it can push toward the larynx or cause discomfort and gagging; if it’s too short, the tongue can still block the airway. The nose-to-ear landmark is chosen because it correlates with the depth of the oropharynx in adults, providing a reliable, easily identified reference. Other landmarks might not line up with the actual insertion depth and could lead to under- or over-insertion.