What score is considered high risk on STOP-BANG?

A score of 5–8 is considered high risk for clinically significant OSA. Score 3–4 is intermediate risk. Score 0–2 is low risk. For preoperative anesthesia risk stratification, some guidelines consider ≥3 a meaningful threshold for OSA precautions, even though 5–8 is the formal high-risk category. The threshold used may vary by institutional protocol and clinical context.

How does sleep apnea affect surgical risk?

Untreated OSA increases perioperative risk through multiple mechanisms: increased sensitivity to opioid-induced respiratory depression (chronic upper airway instability), increased risk of post-extubation airway obstruction and respiratory failure, perioperative atrial fibrillation and cardiac events, hypertensive crises, and difficult intubation (pharyngeal fat deposition). Studies show 2–3× higher rates of post-operative respiratory complications in undiagnosed OSA patients. Perioperative OSA management reduces these risks substantially.

Should patients use CPAP before surgery?

Yes — if a patient has known OSA with prescribed CPAP, they should: continue using CPAP every night in the weeks before surgery (optimal compliance improves outcomes); bring their CPAP device and mask to hospital admission; use CPAP in the recovery room after extubation when safely awake; continue nightly CPAP throughout the hospital stay. Patients who are newly diagnosed with OSA shortly before elective surgery should be offered CPAP titration and use pre-operatively if time permits, as even short-term CPAP use improves outcomes.

What is the difference between polysomnography and home sleep testing for OSA?

Polysomnography (PSG, 'sleep study') is the gold standard, performed in a sleep lab with comprehensive monitoring (EEG, EMG, EOG, airflow, oxygen, leg movements, ECG). It diagnoses all sleep disorders including central apnea, parasomnias, and periodic limb movements. Home Sleep Apnea Test (HSAT) is a simplified device worn at home, measuring airflow, respiratory effort, oxygen saturation, and heart rate. HSAT is accepted as the initial diagnostic test for uncomplicated OSA suspects (AASM guidelines) and is more accessible and less expensive. PSG is preferred when HSAT is inconclusive or when comorbid sleep disorders are suspected.

What is the connection between sleep apnea and hypertension?

OSA is one of the most common identifiable causes of secondary hypertension. Repetitive nocturnal hypoxemia and arousal activate the sympathetic nervous system, raising catecholamines and blood pressure. OSA is present in approximately 50% of patients with resistant hypertension (blood pressure uncontrolled on ≥3 medications). CPAP therapy in OSA patients with hypertension reduces 24-hour blood pressure by 2–6 mmHg and has a more dramatic effect in resistant hypertension. All patients with resistant hypertension should be screened for OSA.

Can STOP-BANG be used for children?

No — STOP-BANG was validated in adult populations and is not appropriate for children. Pediatric OSA has different risk factors (adenotonsillar hypertrophy, craniofacial abnormalities, obesity) and different presentations. The Pediatric Sleep Questionnaire (PSQ) by Chervin et al. (Sleep Med 2000) is a validated screening tool for OSA in children aged 2–18 years. For children with suspected OSA, referral to a pediatric otolaryngologist or sleep medicine specialist is appropriate.

Does STOP-BANG apply to commercial truck drivers?

Yes — STOP-BANG is commonly used in commercial driver medical evaluations. The Federal Motor Carrier Safety Administration (FMCSA) does not mandate a specific OSA screening tool but recommends OSA evaluation for drivers with BMI >35, neck size >17 inches (male) or >15.5 inches (female), or clinical signs and symptoms. STOP-BANG ≥3 in a commercial driver should trigger formal sleep study referral and medical certification review. Untreated OSA in commercial drivers is associated with 2–7× increased crash risk from excessive daytime sleepiness.

Online Medical Tools — STOP-BANG

Printed on 7/19/2026

For informational purposes only. This is not medical advice.

Pulmonology

STOP-BANG

STOP-BANG is a widely used screening questionnaire for obstructive sleep apnea (OSA). It combines symptom and clinical risk factors into an 8-point score to stratify patients into low, intermediate, or high OSA risk before diagnostic sleep testing.

Formula: STOP-BANG score = count of positive responses (0-8). Risk: low (0-2), intermediate (3-4), high (5-8).

Save your results with a free account

Keep a history of calculations, favorite tools, and access your dashboard anytime.

Create free account Sign in

How It Works

Ask the patient (or partner) 8 yes/no questions

Administer the 8 STOP-BANG questions about sleep-related symptoms and risk factors. Partner or bed-partner report is especially valuable for observed apnea, which the patient themselves cannot reliably assess. Each 'Yes' answer scores 1 point. The questionnaire takes approximately 1–2 minutes to complete.

Count positive responses and assign risk category

Total the number of 'Yes' answers (0–8 points). Low Risk = 0–2: unlikely OSA, no sleep referral typically needed. Intermediate Risk = 3–4: possible OSA, use clinical judgment about polysomnography referral. High Risk = 5–8: likely clinically significant OSA, referral for home sleep apnea test (HSAT) or attended polysomnography is strongly recommended.

Act on the result and communicate to the surgical team if relevant

High-risk STOP-BANG results (≥5) before elective surgery should be communicated to the anesthesiology team. Post-operative monitoring for ≥3 hours in a monitored setting is recommended for high-risk patients. For non-surgical settings, high-risk patients should be referred for formal sleep evaluation. Known OSA patients should be instructed to bring their CPAP device to hospital admission.

Who Uses the STOP-BANG

Pre-Operative OSA Screening Before Sedation/Anesthesia

Anesthesiologists & Pre-Admission Nurses

STOP-BANG is the most widely used validated preoperative OSA screening tool. Undiagnosed OSA dramatically increases perioperative risk from sedatives, opioids, and muscle relaxants — all of which suppress upper airway tone and respiratory drive. A score ≥3 before elective surgery should prompt discussion with the surgical and anesthesiology team about monitoring needs, CPAP use, and post-operative disposition (PACU vs monitored floor). ASA perioperative OSA guidelines are built around STOP-BANG cutoffs.

Primary Care and Sleep Clinic Initial Screening

Primary Care Physicians & Sleep Medicine Specialists

STOP-BANG efficiently triages patients with sleep complaints (snoring, daytime sleepiness, witnessed apneas) in primary care. A score ≥3 identifies patients who would benefit from home sleep apnea testing or polysomnography referral, prioritizing the diagnostic workload in busy practices. Estimated 80% of moderate-to-severe OSA is undiagnosed — STOP-BANG is a critical detection tool in primary care.

Commercial Driver Fitness-for-Duty Assessment

Occupational Medicine Physicians

Commercial drivers (truck, bus, heavy machinery) with untreated OSA have 2–7 times higher crash risk due to excessive daytime sleepiness. FMCSA (Federal Motor Carrier Safety Administration) guidelines recommend OSA screening for commercial drivers. STOP-BANG ≥3 supports mandatory medical evaluation and sleep study referral before return-to-work clearance in safety-sensitive occupations.

Bariatric Surgery Pre-Operative Evaluation

Bariatric Surgery Teams

Obesity is the strongest modifiable risk factor for OSA, and OSA prevalence reaches 70–80% in bariatric surgery candidates. STOP-BANG is used routinely in bariatric pre-operative assessment. Given the high pre-test probability, most bariatric programs use a lower STOP-BANG threshold (≥3) to trigger mandatory sleep study, ensuring OSA is diagnosed and treated with CPAP before surgery. Post-operatively, significant weight loss can resolve or reduce OSA severity.

Occupational Health and Pilot/Military Medical Clearance

Aviation & Military Medical Officers

Pilots, air traffic controllers, and military personnel with untreated OSA represent significant safety risks. FAA medical standards require evaluation and treatment of OSA for Special Issuance medical certification. STOP-BANG provides a standardized initial screen that aviation medical examiners can use to identify candidates requiring formal polysomnography before medical clearance.

Pro Tips

STOP-BANG is designed for high sensitivity, not specificity

STOP-BANG has sensitivity of 92–97% at cutoff ≥3 for detecting any OSA (AHI ≥5). This means it is designed to catch nearly all OSA cases — at the cost of many false positives. Do not use STOP-BANG to rule in OSA or make treatment decisions. It identifies who needs formal sleep testing. Approximately 30% of the general population will score ≥3 even without OSA.

Neck circumference >40 cm is the single strongest predictor

Neck circumference >40 cm (16 inches) is the single item most strongly correlated with OSA and difficult intubation, reflecting upper airway fat deposition. Measure neck circumference at the level of the thyroid cartilage (Adam's apple) for standardized assessment. In patients with morbid obesity, collar size (shirt size) can be used as a surrogate: >17 inches (male) / >16 inches (female) is the conventional cutoff.

High STOP-BANG before surgery requires anesthesiology communication

STOP-BANG ≥5 before elective surgery is a clinically significant finding that should be explicitly documented and communicated to the anesthesiology team in the pre-operative note. ASA perioperative guidelines recommend: PACU monitoring ≥3 hours for high-risk patients, minimizing opioid use (consider NSAIDs, regional analgesia), lateral or semi-upright positioning post-operatively, and supplemental oxygen monitoring. Patients with known OSA should bring their CPAP device for hospital use.

Known OSA patients must bring their CPAP to hospital admission

Patients with known, treated OSA should be instructed to bring their CPAP/BiPAP device to all hospital admissions and pre-operative visits. Hospital CPAP devices may have different settings, masks, or features the patient is not accustomed to. Using the patient's own CPAP device with their personalized pressure settings and mask interface significantly improves compliance and reduces perioperative respiratory complications.

OSA increases sensitivity to opioids and sedatives

Untreated OSA patients have increased sensitivity to respiratory depression from opioids, benzodiazepines, and other sedatives/anesthetics. This is due to chronic hypoxemia conditioning of central chemoreceptors and already-compromised upper airway patency during sleep. When prescribing sedatives, anxiolytics, or sleep aids to high STOP-BANG patients, use the lowest effective dose, avoid benzodiazepines for insomnia (can worsen respiratory events), and provide patient education about signs of respiratory compromise.

80% of moderate-severe OSA remains undiagnosed

Population studies (Young et al., Sleep 1997) estimated that approximately 80% of men and 90% of women with moderate-to-severe OSA are undiagnosed. Despite growing awareness, OSA remains one of the most underdiagnosed chronic conditions. Primary care implementation of systematic STOP-BANG screening in at-risk groups (obese, hypertensive, male, middle-aged, complaining of snoring or fatigue) could substantially reduce this diagnostic gap.

OSA and cardiovascular risk are strongly linked

Untreated moderate-severe OSA is associated with: 2–3× increased risk of hypertension (especially resistant hypertension), 2–4× increased risk of atrial fibrillation, increased risk of stroke, heart failure, and type 2 diabetes. CPAP therapy reduces blood pressure (particularly in resistant hypertension), reduces arrhythmia burden, and improves insulin sensitivity. Screening for OSA should be routine in all patients with resistant hypertension, new atrial fibrillation, or unexplained heart failure.

Home sleep apnea test (HSAT) is acceptable for most patients

The American Academy of Sleep Medicine (AASM) and USPSTF recommendations now support home sleep apnea testing (HSAT) as the initial diagnostic test for uncomplicated moderate-to-severe OSA suspects — it is more accessible, less expensive, and nearly as accurate as attended polysomnography for diagnosing OSA in otherwise healthy adults. Full attended polysomnography is preferred when central sleep apnea, periodic limb movements, parasomnias, or obesity hypoventilation syndrome are suspected.

Positional OSA is common and easily treated

Positional OSA — significantly worse in the supine position — accounts for approximately 50–60% of OSA cases. In positional OSA, AHI in the supine position is at least twice the non-supine AHI. Positional therapy (sleep position training, positional devices, tennis ball technique) can be highly effective as monotherapy or adjunct to CPAP. Ask patients specifically whether their snoring or apneas are worse when lying on their back during STOP-BANG assessment.

Measure neck circumference at the thyroid cartilage

For standardized STOP-BANG assessment, neck circumference should be measured at the level of the thyroid cartilage (Adam's apple) using a flexible tape measure, with the patient standing upright and the head in a neutral position. A neck circumference >40 cm is the threshold. Studies show neck circumference is a better predictor of OSA than BMI alone because it specifically captures upper airway fat deposition, the primary anatomical risk factor for OSA.

Common Questions About Your Results

Yes — neck circumference measurement point significantly affects the value. The standardized STOP-BANG assessment measures at the level of the thyroid cartilage (Adam's apple). Some clinical protocols measure at the collar or mid-neck, which gives different values. Measuring too low may underestimate upper airway fat, which is the anatomically relevant measurement for OSA risk. Standardize your measurement technique and ensure staff training.

No — STOP-BANG is a screening tool, not a diagnostic test. A STOP-BANG score ≥5 does not diagnose OSA; it identifies patients at high probability who need formal sleep testing (HSAT or polysomnography). Similarly, a score of 0–2 does not rule out OSA, though it makes moderate-severe OSA unlikely. Treatment decisions (CPAP, mandibular advancement device, surgery) require objective sleep study data including AHI, oxygen nadir, and sleep architecture.

Yes — this is a communication breakdown that can have serious patient safety consequences. Preoperative STOP-BANG screening information must reach the anesthesiology team before the day of surgery, not just during the morning rush. Document STOP-BANG score in the pre-operative note with the recommendation for OSA precautions. Many institutions have electronic flags that automatically alert anesthesiology when STOP-BANG ≥3. Advocate for systematic pre-operative OSA communication workflows in your institution.

The 'O' in STOP-BANG (Observed apnea) can be answered 'No' if the patient has no bed partner or sleep observer, acknowledging this is a potentially missed positive finding. In patients who sleep alone and have high clinical suspicion for OSA (obesity, hypertension, significant snoring history), consider a lower threshold for sleep testing even with a lower STOP-BANG score. Home sleep testing devices increasingly include recording features that can document apnea events without a human observer.

Evidence-Based Methodology

STOP-BANG developed by Chung et al. (Anesthesiology 2008) for preoperative OSA screening. Sensitivity 92.9% for any OSA, 87.9% for moderate-severe (AHI ≥15) at threshold ≥3. Meta-analysis by Nagappa et al. (PLoS ONE 2015) across 17 studies confirmed high sensitivity. ASA Perioperative Management of OSA (Gross et al., Anesthesiology 2014). Estimated 80% OSA underdiagnosis from Young et al. (Sleep 1997). AASM recommends HSAT for uncomplicated moderate-severe OSA suspects (Collop et al., J Clin Sleep Med 2007).

Clinical Content Trust

Last reviewed:: April 21, 2026
Guideline version:: General evidence framework v2026.04
Source set version:: Primary-source set v1

How to Interpret Your Result

Higher STOP-BANG scores indicate greater probability of clinically significant obstructive sleep apnea. A high-risk score should prompt referral for formal sleep evaluation and treatment planning.

When to Use This Tool

Use this tool when patients report snoring, daytime sleepiness, witnessed apnea, resistant hypertension, obesity, or perioperative airway concerns.

Limitations

STOP-BANG is a screening instrument and may over-identify risk in some populations. Clinical context and confirmatory sleep testing are required before diagnosis or treatment decisions.

For related assessments, see BMI Calculator, Blood Pressure Calculator and ACT Score.

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.

Changelog

April 21, 2026 · trust-baseline
Clinical trust metadata enabled for this tool page with structured review/version fields.

Related Tools

Body Metrics

BMI Calculator

Calculate your Body Mass Index (BMI) instantly using height and weight. Free, WHO-validated formula with personalized health category insights for adults.

Open Cardiology

Blood Pressure Calculator

Classify blood pressure readings into Normal, Elevated, Stage 1, Stage 2, or Hypertensive Crisis using ACC/AHA thresholds. Includes MAP and pulse pressure.

Open Pulmonology

ACT Score

Calculate the Asthma Control Test score to assess asthma control over the past 4 weeks.

Open

Frequently Asked Questions

STOP-BANG is a validated 8-item screening questionnaire for obstructive sleep apnea (OSA) developed by Chung et al. (Anesthesiology 2008) for preoperative OSA screening. Each letter represents one question: Snoring loudly, Tired/daytime sleepy frequently, Observed apnea during sleep, blood Pressure (hypertension), BMI >35, Age >50, Neck circumference >40 cm, Gender male. Each 'Yes' scores 1 point. Score range: 0–8. It is one of the most widely used and validated OSA screening tools in clinical practice.

Score 0–2 = Low risk for OSA: unlikely clinically significant OSA, no sleep referral typically required. Score 3–4 = Intermediate risk: possible OSA, clinical judgment about whether to pursue formal sleep testing. Score 5–8 = High risk: likely clinically significant OSA, referral for home sleep apnea test (HSAT) or polysomnography is strongly recommended. For preoperative assessment, scores ≥3 trigger OSA precautions per ASA guidelines.

STOP-BANG has sensitivity of 92.9% for any OSA (AHI ≥5) and 87.9% for moderate-to-severe OSA (AHI ≥15) at a cutoff ≥3 (Nagappa et al., PLoS ONE 2015 meta-analysis across 17 studies). Specificity at this cutoff is lower (~36–56%) — it catches nearly all OSA cases but also identifies many patients without OSA as high risk. This high-sensitivity design is appropriate for a screening tool, where missing cases is more harmful than over-referral.

STOP-BANG is the most widely validated and used OSA screening questionnaire globally, particularly in surgical settings. Other validated tools include the Epworth Sleepiness Scale (ESS — measures daytime sleepiness, not OSA-specific), Berlin Questionnaire (similar structure to STOP-BANG, slightly lower sensitivity), and NoSAS score. The AASM recommends STOP-BANG for preoperative screening, while the USPSTF found insufficient evidence for routine primary care screening of asymptomatic adults. For most clinical applications, STOP-BANG remains the first-line validated tool.

Per ASA Perioperative Management of OSA guidelines (Gross et al., Anesthesiology 2014): communicate the result to the anesthesiology team pre-operatively; consider regional anesthesia to minimize systemic opioids; plan post-operative monitoring in PACU for ≥3 hours; use lateral or semi-upright positioning post-operatively (reduces upper airway collapse risk); apply supplemental oxygen and pulse oximetry monitoring until fully awake; minimize benzodiazepine and opioid prescriptions; ensure CPAP availability for known OSA patients. In some cases, elective surgery may be deferred pending OSA evaluation.