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About this tool
Eight yes/no items on snoring, tiredness, blood pressure, BMI, age, neck size and sex give a STOP-BANG score out of 8.
The STOP-BANG questionnaire scores eight risk factors for obstructive sleep apnoea — loud Snoring, daytime Tiredness, Observed pauses in breathing, high blood Pressure, BMI over 35, Age over 50, Neck circumference over 40 cm and male Gender — one point each, for a total out of 8. It comes from Chung and colleagues (Anesthesiology, 2008) and is widely used in pre-operative assessment because it is quick and deliberately sensitive. A total of 0-2 is low risk, 3-4 intermediate and 5-8 high risk of moderate-to-severe apnoea.
Open STOP-BANG Sleep Apnoea Score on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Height and weight become the BMI item, so you never have to work out whether you are over 35 kg/m².
Flags the higher-specificity rule: a STOP subscore of 2 or more combined with male sex, BMI over 35 or a neck over 40 cm.
An item-by-item table shows exactly which of the eight letters scored, not just the total.
A total of 5 to 8 is classed as high risk of moderate-to-severe obstructive sleep apnoea, 3 to 4 as intermediate and 0 to 2 as low. Many anaesthetic departments treat 3 or more as the trigger for extra precautions around surgery.
The original cut-off is a neck circumference greater than 40 cm, roughly a 16-inch collar, measured around the neck at the level of the Adam's apple. Some later versions use sex-specific values of 43 cm for men and 41 cm for women; this page uses the original 40 cm.
Yes. The questionnaire is built to be sensitive rather than specific, but it still misses cases — particularly in slim women, who score no points for BMI, age, neck or gender. If you have witnessed pauses in breathing, morning headaches or unrefreshing sleep, ask for assessment regardless of the number.
No. It only estimates the likelihood that a sleep study would find moderate-to-severe apnoea. Diagnosis needs an overnight sleep study — home respiratory polygraphy or in-lab polysomnography — which measures how many times per hour breathing actually stops. Discuss your result with a doctor.
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