Mallampati Score Calculator
Assess difficult airway risk using the Mallampati classification of oropharyngeal view. Enter values for instant results with step-by-step formulas.
Formula
Risk Score = Mallampati Class + Neck Mobility Factor + Mouth Opening Factor + Thyromental Distance Factor
The composite risk score combines the Mallampati oropharyngeal classification (1-4) with additional airway predictors including neck mobility, inter-incisor distance (mouth opening), and thyromental distance to provide a comprehensive difficult airway risk assessment.
Worked Examples
Example 1: Preoperative Assessment - Class II Airway
Problem: A 45-year-old male presents for elective cholecystectomy. Mallampati Class II, mouth opening 4.5 cm, thyromental distance 7 cm, normal neck mobility. Assess airway risk.
Solution: Mallampati Class II = score 2\nMouth opening 4.5 cm = adequate (no added risk)\nThyromental distance 7 cm = normal (no added risk)\nNeck mobility normal = no added risk\nTotal risk score = 2 (Low risk)\nClassification: Standard airway expected
Result: Low risk. Standard direct laryngoscopy appropriate with routine backup plan.
Example 2: High-Risk Airway Evaluation - Class IV
Problem: A 62-year-old obese female scheduled for thyroidectomy. Mallampati Class IV, mouth opening 2.8 cm, thyromental distance 5.5 cm, limited neck mobility. Assess airway risk.
Solution: Mallampati Class IV = score 4\nMouth opening 2.8 cm = restricted (+2 risk)\nThyromental distance 5.5 cm = short (+2 risk)\nNeck mobility limited = +1 risk\nTotal risk score = 9 (High risk)\nClassification: Anticipated difficult airway
Result: High risk (score 9). Consider awake fiberoptic intubation. Difficult airway cart required.
Frequently Asked Questions
What is the Mallampati score and why is it used?
The Mallampati score is a clinical classification system used in anesthesiology to predict the difficulty of endotracheal intubation. Developed by Dr. Seshagiri Rao Mallampati in 1985, this scoring system evaluates the visibility of oropharyngeal structures when the patient opens their mouth and protrudes the tongue. The classification ranges from Class I (full visibility of the soft palate, fauces, uvula, and tonsillar pillars) to Class IV (only the hard palate is visible). Higher Mallampati classes correlate with increased difficulty during laryngoscopy and intubation, making this assessment a crucial component of the preoperative airway evaluation performed before any procedure requiring general anesthesia.
How is the Mallampati examination performed correctly?
The Mallampati examination should be performed with the patient sitting upright and facing the examiner at eye level. The patient is instructed to open their mouth as wide as possible and protrude the tongue without phonating, meaning they should not say 'ahh' during the assessment. The examiner then observes which oropharyngeal structures are visible. Phonation can artificially elevate the soft palate and give a falsely favorable classification. The examination should be performed in a well-lit room, and the patient should be cooperative and able to follow instructions. Some practitioners use the modified Mallampati classification which was refined by Samsoon and Young to include four distinct classes rather than the original three.
What are the four Mallampati classes and their meanings?
Class I indicates full visibility of the soft palate, fauces, uvula, and tonsillar pillars, suggesting an easy intubation. Class II shows the soft palate, fauces, and uvula but the tonsillar pillars are hidden behind the tongue base, still suggesting a generally straightforward airway. Class III reveals only the soft palate and the base of the uvula, indicating potential difficulty with direct laryngoscopy. Class IV shows only the hard palate with no soft tissue structures visible, strongly predicting a difficult intubation. Studies show that Class III and IV airways have a significantly higher incidence of difficult or failed intubation, with Class IV carrying the highest risk of requiring advanced airway management techniques.
How accurate is the Mallampati score for predicting difficult airways?
The Mallampati score alone has moderate sensitivity (approximately 60-70%) and specificity (approximately 70-80%) for predicting difficult intubation. Its positive predictive value varies considerably across studies, ranging from 13% to 50%, meaning that many patients with high Mallampati scores can still be intubated without difficulty. However, when combined with other assessment tools such as thyromental distance, neck mobility, mouth opening, and upper lip bite test, the predictive accuracy improves substantially. The Mallampati score remains valuable as a screening tool because it is quick, non-invasive, and requires no equipment. No single airway assessment tool is perfectly accurate, which is why a multimodal evaluation approach is recommended.
Can the Mallampati score change over time in the same patient?
Yes, the Mallampati score can change in the same patient due to several factors. Weight gain often increases the Mallampati class because fat deposition in pharyngeal tissues reduces the visible oropharyngeal space. Pregnancy causes progressive airway edema, potentially increasing the Mallampati score from first trimester to delivery, which is why airway reassessment before cesarean section is essential. Conditions such as angioedema, infections like peritonsillar abscess, or tumors of the oral cavity can acutely change the classification. Even patient positioning, cooperation, and the degree of tongue protrusion can affect the score on a given assessment. Therefore, the Mallampati evaluation should be performed at each preoperative visit rather than relying on prior documentation.
What is the difference between original and modified Mallampati classification?
The original Mallampati classification published in 1985 contained only three classes. Class I showed the faucial pillars, soft palate, and uvula. Class II showed the faucial pillars and soft palate but the uvula was masked by the tongue base. Class III showed only the soft palate. In 1987, Samsoon and Young modified the classification into four classes by subdividing the original Class III into two categories, creating the current Class III (soft palate and base of uvula visible) and Class IV (only hard palate visible). The modified four-class system is now used almost universally in clinical practice because it provides better discrimination of difficult airway risk and improved correlation with Cormack-Lehane laryngoscopic views during intubation.