What is the STOP‑BANG questionnaire and how is it used to screen for obstructive sleep apnea?

STOP-BANG Questionnaire for OSA Screening

The STOP-BANG questionnaire is an 8-item screening tool for obstructive sleep apnea (OSA) that should NOT be used alone to diagnose OSA, but serves as a highly sensitive screening instrument to identify patients who need definitive diagnostic testing with polysomnography or home sleep apnea testing.

What is STOP-BANG?

The STOP-BANG questionnaire consists of 8 dichotomous (yes/no) items 1:

Four symptom questions (STOP):

• Snoring (loud snoring)
• Tiredness (daytime fatigue/sleepiness)
• Observed apnea (witnessed breathing pauses during sleep)
• Pressure (high blood pressure/hypertension)

Four clinical attributes (BANG):

• BMI > 35 kg/m²
• Age > 50 years
• Neck circumference > 40 cm
• Gender (male)

Each "yes" answer scores 1 point, with total scores ranging from 0-8 1, 2.

Risk Stratification

Score interpretation for moderate-to-severe OSA (AHI ≥15):

• 0-2 points: Low risk (18% probability of moderate-to-severe OSA)
• 3-4 points: Intermediate risk (requires additional criteria for classification)
• 5-8 points: High risk (60% probability of moderate-to-severe OSA) 1

For severe OSA (AHI ≥30), probability increases from 4% (score 0-2) to 38% (score 7-8) 1.

Performance Characteristics

The STOP-BANG demonstrates high sensitivity but low specificity 3:

For moderate-to-severe OSA (AHI ≥15):

• Sensitivity: 88-93% 3, 1, 4
• Specificity: 29-36% 3
• Negative predictive value: 90% 1

For severe OSA (AHI ≥30):

• Sensitivity: 90-100% 1, 4
• Negative predictive value: 93-100% 1, 4

The high sensitivity makes it excellent for ruling out OSA when negative, but poor specificity means many false positives 3.

Critical Limitation: Cannot Diagnose OSA

The American Academy of Sleep Medicine (AASM) strongly recommends that clinical tools, questionnaires, and prediction algorithms NOT be used to diagnose OSA in adults in the absence of polysomnography or home sleep apnea testing 3. The STOP-BANG produces too many false negatives (61 per 1,000 patients at 87% prevalence) to serve as a diagnostic instrument 3.

Appropriate Clinical Use

Use STOP-BANG to:

1. Screen patients at risk for OSA who need further diagnostic testing
2. Triage patients in preoperative settings to identify those requiring perioperative OSA management 2, 4
3. Identify hospitalized patients who may benefit from in-hospital OSA evaluation 5

After positive screening (score ≥3):

• Proceed to polysomnography (gold standard) or home sleep apnea testing for definitive diagnosis 3
• If single home sleep test is negative/inconclusive, perform polysomnography 3

Important Caveats

Geographic variation exists: The questionnaire performs less well in East Asian populations (AUC 0.52) compared to other regions (AUC >0.80) 6. The original BMI cutoff of >35 kg/m² appears appropriate even for Asian populations, as lower cutoffs (27.5-30 kg/m²) did not improve performance 7.

Population-specific considerations: The STOP-BANG was developed and validated primarily in middle-aged, obese males in surgical/sleep clinic settings 3. Performance may differ in general population screening, where prevalence is lower 7.

U.S. Preventive Services Task Force position: There is insufficient evidence to recommend for or against screening asymptomatic adults for OSA in primary care settings 8, though this does not preclude using STOP-BANG in symptomatic patients or high-risk populations.

Clinical Algorithm

1. Administer STOP-BANG to patients with suspected OSA or high-risk features (obesity, hypertension, cardiovascular disease, daytime sleepiness)
2. Score ≥3: Refer for polysomnography or home sleep apnea testing
3. Score 0-2: OSA less likely, but maintain clinical suspicion if symptoms persist
4. Never use STOP-BANG alone to confirm or exclude OSA diagnosis—objective testing is mandatory 3