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.