Originally developed to predict difficult intubation in anesthesia, the Mallampati classification is now routinely used to assess obstructive sleep apnea risk. It grades what your throat looks like — specifically, how much of the back of your throat is visible when you open wide.
Disclaimer: Mallampati is a supplementary indicator, not a diagnostic test. It does not replace a sleep study. Always consult a physician for medical evaluation.
Dr. S. Rao Mallampati developed the classification in the 1980s as a way for anesthesiologists to predict how difficult it would be to intubate a patient. The insight was simple: if you can't see much of the back of the throat with the mouth open, the airway is likely narrower or surrounded by more soft tissue — making both intubation and nighttime airway collapse more likely.
Research over the subsequent decades confirmed that the same anatomy that makes intubation harder also predicts a higher risk for obstructive sleep apnea. Patients with Class 3 or Class 4 Mallampati scores have a significantly higher OSA prevalence than those with Class 1.
| Class | What You See | OSA Risk |
|---|---|---|
| Class I | Full visibility: soft palate, uvula, fauces, and both tonsillar pillars are all visible | Low |
| Class II | Soft palate and uvula visible; fauces visible; tonsillar pillars partially hidden by base of tongue | Low–Moderate |
| Class III | Soft palate visible; only base of uvula visible; tongue base obscures most structures | Moderate–High |
| Class IV | Only hard palate visible; soft palate completely blocked by tongue | High |
You can roughly assess your own Mallampati class with a mirror and a good light source, though self-assessment is less reliable than clinical assessment (you'll tend to open your mouth differently without guidance):
If you can see all the way to the back (uvula hanging clearly visible, arch structures on both sides visible): likely Class I or II. If you can barely see the uvula, or only the top of it peeks out: likely Class III. If you can't see the uvula at all and the tongue fills the entire visible space: Class IV.
Important: The standardized clinical Mallampati assessment is done in a seated position, with the patient's head in neutral position, mouth open maximally, tongue protruded maximally, and without phonation (before saying "Aaah" at rest). Variations in technique produce different results — which is why clinician assessment is more reliable than self-assessment.
Studies on Mallampati and OSA show:
This is why the Axion Sleep Apnea Screener uses Mallampati as a supplementary indicator rather than incorporating it into the STOP-BANG score. The clinical evidence supports this approach — adding Mallampati to STOP-BANG improves discrimination, but the STOP-BANG score itself remains the primary validated tool.
Mallampati is the most widely used anatomical screen, but clinicians also assess:
Class III or IV alone doesn't mean you have sleep apnea. Many people with higher Mallampati scores sleep perfectly well. What it means:
The Axion Sleep Apnea Screener uses on-device AI to classify your throat image as Mallampati I–IV, combined with the full 8-item STOP-BANG questionnaire. Your data never leaves your phone.
Learn About the Screener →References: Mallampati SR et al. Can Anaesth Soc J 1985. Nuckton TJ et al. NEJM 2006;354(23):2549-2550. For informational purposes only.
The Mallampati classification is a 4-class scoring system that assesses the visibility of throat structures when the mouth is open and the tongue is extended. Class I shows full visibility of the soft palate, uvula, and tonsils. Class IV shows only the hard palate. Higher classes (III-IV) are associated with increased risk of obstructive sleep apnea and difficult airway management.
A Mallampati score of III or IV indicates restricted airway space, which is associated with a significantly higher risk of obstructive sleep apnea. Studies show that each one-class increase in Mallampati score is associated with approximately 2.5 times the odds of having OSA. It is used alongside the STOP-BANG questionnaire for comprehensive sleep apnea risk assessment.
To check your Mallampati score at home: open your mouth wide, extend your tongue as far as possible, and look in a mirror or take a photo. If you can clearly see your tonsils, uvula, and soft palate — that is Class I (low risk). If you can only see part of the uvula it is Class II, if only the soft palate it is Class III, and if only the hard palate it is Class IV (higher risk). The Sleep Apnea Screener app by Axion AI guides you through this assessment.
Mallampati Class III or IV indicates elevated risk for obstructive sleep apnea. Class III shows only the soft palate and base of uvula, while Class IV shows only the hard palate. These classes suggest reduced pharyngeal space, which is a known anatomical risk factor for upper airway collapse during sleep.