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Printed on 7/19/2026
For informational purposes only. This is not medical advice.
The Mallampati classification is a bedside airway assessment based on visibility of oropharyngeal structures with the mouth open and tongue protruded. It helps estimate potential intubation difficulty and supports pre-anesthetic planning.
Formula: Mallampati class is a visual airway grade from I (best view) to IV (poorest view).
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Have the patient sit upright (or be positioned as upright as possible). Ask the patient to open their mouth as wide as possible and protrude the tongue fully WITHOUT phonating (no saying 'ahh'). Phonation causes the soft palate to elevate, artificially improving the apparent Mallampati class and introducing the most common scoring error. Use adequate lighting — a penlight or bright overhead light directed into the oropharynx. Assess what pharyngeal structures are visible from your line of sight at the patient's level. The four target structures are: tonsils/tonsillar pillars, soft palate, full uvula, and hard palate.
Classify based on what is visible with the mouth fully open and tongue protruded without phonation: Class I — soft palate, full uvula, fauces (space between pillars), and tonsillar pillars all visible. Class II — soft palate and upper uvula visible; tonsillar pillars NOT visible or partially obscured by tongue base. Class III — soft palate visible but uvula is masked by the base of the tongue; only the base of the uvula may be seen. Class IV — soft palate NOT visible; only the hard palate is visible. Classes I and II generally predict easy laryngoscopy and intubation. Class III suggests potential difficulty with direct laryngoscopy. Class IV indicates likely difficult direct laryngoscopy and warrants advanced airway planning.
Never use Mallampati in isolation. Apply the LEMON mnemonic for a comprehensive airway assessment: L = Look externally (obesity, facial trauma, short neck, beard, large tongue, receding mandible, protruding incisors, trismus); E = Evaluate 3-3-2 rule (inter-incisor distance ≥3 finger widths, hyoid-to-chin distance ≥3 finger widths, thyroid cartilage to floor of mouth ≥2 finger widths); M = Mallampati class (this tool); O = Obstruction (epiglottitis, peritonsillar abscess, Ludwig's angina, foreign body, hematoma, tumor); N = Neck mobility (ability to flex/extend neck, cervical spine precautions, ankylosing spondylitis). Plan airway strategy: Class I–II + favorable LEMON = standard direct or video laryngoscopy. Class III–IV or 2+ LEMON risk factors = plan for video laryngoscopy as first-line, have supraglottic airway (LMA) and surgical airway available, and consider awake fiberoptic intubation if time allows.
Anesthesiologists, CRNAs, anesthesia residents
Mallampati classification is a standard component of every pre-anesthetic airway assessment, documented on the anesthetic record and used to plan the intubation approach. A Class III or IV finding prompts planning for video laryngoscopy as first choice, availability of backup airway devices (supraglottic airways, bougie), anesthesia with a physician colleague present for difficult airway management, and consideration of awake fiberoptic intubation for Class IV with multiple additional predictors. The pre-anesthetic airway assessment should also include thyromental distance, mouth opening, neck mobility, and prior airway history.
Emergency physicians, emergency nurses, paramedics
In emergency medicine, a rapid Mallampati assessment (performed in under 30 seconds) informs the RSI plan before urgent intubation. Class III–IV or a concerning LEMON assessment should prompt the emergency physician to: (1) have video laryngoscopy as the primary device rather than direct laryngoscopy, (2) ensure a supraglottic airway (LMA) is opened and immediately available, (3) have a surgical airway kit at bedside for 'can't intubate, can't oxygenate' rescue, and (4) consider calling for anesthesia backup before the first attempt if time permits. In truly emergent 'crash airways,' move directly to RSI with the best available device.
Intensivists, anesthesiologists, ICU nurses
Mallampati class should be documented in the ICU airway assessment for any patient who may require intubation or reintubation. This is particularly critical for patients who were previously intubated (prior airway documentation is invaluable), patients with known airway pathology (head and neck cancer, angioedema, burn patients, post-operative neck surgery), and patients with progressive airway edema (anaphylaxis, burn patients, post-operative head/neck cases). If Mallampati was Class III or IV on admission, plan early intubation before airway deterioration makes it impossible.
Surgery residents, medical students, hospitalists on surgical floors
Surgical trainees performing pre-operative evaluations should assess and document Mallampati class as part of the standard pre-operative note, even though final airway planning is done by anesthesia. This practice builds systematic airway assessment habits, facilitates communication with the anesthesia team ('I noted a Class III Mallampati during my H&P'), and identifies high-risk airways that may require early anesthesia notification before the day of surgery. Documenting Mallampati in the surgical note also provides continuity if the patient has an urgent or emergent airway need while on the surgical ward.
Anesthesiologists, emergency physicians, airway management educators
Mallampati Class III–IV is associated with higher rates of difficult direct laryngoscopy (Cormack-Lehane Grade III–IV), supporting first-choice use of video laryngoscopy (GlideScope, McGrath, C-MAC) rather than direct laryngoscopy in these patients. A 2018 systematic review (Lewis et al., Cochrane) showed that video laryngoscopy compared to direct laryngoscopy was associated with fewer failed intubations, particularly in patients with anticipated difficult airways. Integrating Mallampati into departmental and institutional pre-operative airway screening protocols ensures appropriate equipment preparation and staffing before the patient reaches the operating room.
Asking the patient to say 'ahh' causes the soft palate to elevate, making the uvula and tonsils more visible and artificially improving the Mallampati class by one grade in many patients. The correct technique is mouth fully open and tongue protruded in silence, without any phonation. If you assess with phonation, you may classify a Class III patient as Class II and fail to prepare adequately for potential difficulty. Train yourself and your team to always give the instruction: 'Open your mouth wide, stick out your tongue — and stay quiet.'
Meta-analysis shows Mallampati alone has sensitivity of only ~49% for difficult laryngoscopy, meaning more than half of difficult airways are missed by Mallampati alone. The positive likelihood ratio is ~3.0, which is modest. Combining Mallampati with thyromental distance, inter-incisor distance (mouth opening), body habitus, neck mobility, and history of prior difficult airway substantially improves prediction. The LEMON mnemonic provides a systematic framework. In any patient with Mallampati III–IV plus ONE additional LEMON risk factor, plan for video laryngoscopy as first choice.
An inter-incisor distance of less than 3 cm (roughly two finger-widths) is one of the strongest individual predictors of difficult direct laryngoscopy, often outperforming Mallampati class in isolation. Always measure or estimate mouth opening in addition to assessing Mallampati. A patient with Mallampati Class I but mouth opening of 2.0 cm (e.g., due to trismus, temporomandibular joint disease, or prior mandibular surgery) presents a significantly difficult airway despite the favorable Mallampati class.
Obstructive sleep apnea (OSA) is independently associated with difficult mask ventilation and difficult intubation, and its co-occurrence with high Mallampati class is synergistic. Patients with OSA (especially if untreated or CPAP non-compliant) and Mallampati III–IV require: (1) pre-oxygenation with CPAP or high-flow nasal oxygen (Optiflow/Airvo), (2) video laryngoscopy as first choice, (3) ramped position (ear-to-sternal-notch alignment) to optimize laryngeal view, (4) avoid premature paralysis before establishing ventilation if planning modified RSI. Document CPAP compliance status pre-operatively.
For patients with Mallampati Class IV plus multiple additional predictors (limited mouth opening, fixed flexion deformity, large neck tumor, prior failed intubation), or for patients in whom hypoxia during anesthesia induction could be immediately catastrophic (severe pulmonary hypertension, critical airway stenosis), awake fiberoptic intubation (AFOI) with topical anesthesia and light sedation is the safest approach. AFOI allows the patient to maintain airway patency and spontaneous respiration throughout the procedure. This decision should be made before the patient reaches the operating room, not after a failed intubation attempt under general anesthesia.
Multiple society guidelines (SIAARTI, CAG, DAS) now recommend video laryngoscopy (VL) as either the primary choice or an early rescue choice for anticipated difficult airways. VL improves the laryngeal view by one Cormack-Lehane grade in most patients compared to direct laryngoscopy. However, VL does not guarantee successful intubation — a good view does not always translate to easy tube passage, especially with hyperangulated blades (GlideScope). Practice with VL regularly so it is a familiar tool rather than a last resort.
Every difficult airway case should have a pre-defined CICO rescue plan before anesthesia induction. CICO means the patient cannot be intubated AND cannot be adequately oxygenated with mask ventilation or supraglottic airway. In this scenario, the only life-saving intervention is immediate surgical airway: cricothyrotomy (scalpel-bougie-tube technique) in adults. Every anesthesiologist and emergency physician must be capable of performing cricothyrotomy — practice regularly on simulators. A surgical airway tray should be immediately accessible in every anesthetizing location.
A history of prior difficult or failed intubation, documented in the anesthetic record, is the single most important predictor of a challenging airway in the current case. Always explicitly ask: 'Have you ever been told you were difficult to intubate? Have you ever woken up with a sore throat that the anesthesiologist commented on?' Review all prior anesthetic records if available. An alert card system or prominent documentation in the electronic medical record significantly improves safety for patients with a known difficult airway history.
Morbid obesity is associated with difficult mask ventilation due to reduced functional residual capacity and increased airway soft tissue. Pregnancy (especially third trimester) causes breast engorgement, supraglottic edema, and reduced neck mobility in addition to changes in airway anatomy. Mallampati class can worsen during pregnancy compared to non-pregnant state. For both populations: use ramped/sniffing position, pre-oxygenate aggressively with high FiO2, have VL available first-line, and apply LEMON comprehensively rather than relying on Mallampati alone.
Every anesthesia team should pre-brief the airway plan before induction in any patient with predicted difficult airway: Plan A (primary intubation method), Plan B (if Plan A fails — supraglottic airway), Plan C (emergency oxygenation — supraglottic airway or BVM), Plan D (surgical airway). Verbalize the plan out loud to the team: 'This is a Mallampati III with limited mouth opening. Plan A is video laryngoscopy with a bougie. Plan B is LMA ProSeal. If we can't oxygenate, we'll go to cric. Is everyone ready?' This crew resource management approach is endorsed by the Difficult Airway Society guidelines.
Mallampati classification was first described by Mallampati et al. (Can Anaesth Soc J 1985) and modified to the current 4-class system by Samsoon & Young (Anaesthesia 1987). Meta-analysis by Shiga et al. (Anesthesiology 2005) of 42 studies: sensitivity 49%, specificity 86%, positive LR 3.0 for difficult laryngoscopy. The Cochrane review by Lewis et al. (2016, updated 2018) demonstrated that video laryngoscopy reduces failed first-attempt intubation rates, particularly in anticipated difficult airways. ASA Difficult Airway Guidelines 2022 (Apfelbaum et al.) recommend comprehensive pre-operative airway assessment including Mallampati class as one of multiple predictors.
Higher Mallampati classes indicate less oropharyngeal visibility and increased potential for difficult direct laryngoscopy.
Use this tool during pre-anesthesia airway evaluation, pre-procedure sedation planning, and perioperative difficult-airway preparation.
Mallampati has inter-observer variability and limited standalone predictive accuracy. It should not be the sole determinant of airway strategy.
For related assessments, see ASA Class, RCRI Score and ECOG Status.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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