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TOOLS · SCREENER
STOP-Bang score: what your number means
Enter how many of the eight STOP-Bang questions you answered yes to. A score of 0–2 is low risk for obstructive sleep apnea, 3–4 is intermediate, and 5–8 is high. For a 3 or 4, two quick follow-up questions decide whether your risk is actually high.
Published scoring · Chung et al., Anesthesiology 2008
- About 1 minute
- Free, no sign-up
- Counts toward your Sleep Check-up
Sleep Check-up
0 of 6 checks done
Finish this one to reach 1 of 6.
- NoSAS (not started)
- STOP-Bang (next)
- Berlin (not started)
- Epworth (not started)
- Insomnia (not started)
- NOSE (not started)
Enter your STOP-Bang score (0–8) to see your sleep apnea risk level — low, intermediate or high — with the published follow-up rule for scores of 3–4.
What your result looks like
A sample result. Yours appears here the moment you finish, with what it means and what to do next. Every possible result is listed beside it.
Intermediate risk
4/4
04
Your STOP-Bang score of {score} is in the intermediate range.
Your answers fall between low and high risk, and the follow-ups did not move you up. Talking to a clinician is reasonable, especially if you are sleepy or a partner has seen you stop breathing.
- Take the Berlin questionnaire for a second view
- Take the NoSAS check
- See what a sleep study's AHI bands mean
0–2Low risk
Your STOP-Bang score of {score} is in the low-risk range.
3–4Intermediate risk
Your STOP-Bang score of {score} is in the intermediate range.
Either side of 3High risk
Your STOP-Bang result is in the high-risk range.
Milestone addedSTOP-Bang done · 4 of 6 checks
Saved to your account. We'll remind you to retake in 180 days.
Look up your number
You need your STOP-Bang total, from your clinician or the official questionnaire at stopbang.ca. If you don't have one, the free NoSAS check uses similar measurements.
What this tool does
STOP-Bang was developed to screen surgical patients for obstructive sleep apnea and is now used widely. It is designed to be sensitive: better at not missing apnea than at confirming it, so a high score is sometimes a false alarm.
This page interprets your total. It does not show the questionnaire, which is copyrighted by the University Health Network, and it cannot diagnose sleep apnea or its severity.
How the score works
Each letter is one yes-or-no question, listed here by topic only.
| Letter | Topic |
|---|---|
| S | Snoring |
| T | Tiredness during the day |
| O | Observed pauses in breathing |
| P | High blood pressure |
| B | BMI over 35 |
| A | Age over 50 |
| N | Neck circumference (threshold as on the official form) |
| G | Gender: male |
| Total yes answers | Risk |
|---|---|
| 0–2 | Low |
| 3–4 | Intermediate (high if both follow-ups apply) |
| 5–8 | High |
The follow-up rule for 3–4 comes from Chung and colleagues (Chest 2016): if at least two of S, T, O and P are yes, and you are male, have a BMI over 35, or have a neck circumference of 40 cm (16 in) or more, the risk is classed as high.
Reading your result
0–2, low. Moderate to severe apnea is unlikely on these answers. Symptoms still matter more than a score.
3–4, intermediate. Worth discussing, particularly with symptoms.
High (5–8, or 3–4 with both follow-ups). Ask about a sleep study.
From screening score to therapy data
If a sleep study leads to CPAP, Apnealytics picks up where STOP-Bang ends. Your dashboard shows residual AHI, usage, leak and pressure every night, and Trends shows whether symptoms like tiredness — the T in STOP-Bang — improve as usage settles. Pair it with the Epworth interpreter to track sleepiness over your first months.
Sources
- Chung F, Yegneswaran B, Liao P, et al. STOP questionnaire: a tool to screen patients for obstructive sleep apnea. Anesthesiology, 2008.
- Chung F, Abdullah HR, Liao P. STOP-Bang questionnaire: a practical approach to screen for obstructive sleep apnea. Chest, 2016.
FAQ
What is a good STOP-Bang score?
A score of 0 to 2 is classed as low risk for moderate to severe obstructive sleep apnea. It is not a guarantee: the questionnaire screens, it does not diagnose. If you have loud snoring, witnessed pauses or strong daytime sleepiness, mention them to your clinician whatever your score.
What does a STOP-Bang score of 3 or 4 mean?
It is intermediate risk. The published refinement asks two follow-ups. If at least two of your yes answers were snoring, tiredness, observed pauses or high blood pressure, and you are also male, have a BMI over 35 or a large neck, your risk is reclassified as high.
Why does STOP-Bang often overestimate risk?
It was designed to be sensitive so that few cases are missed, for example before surgery. The trade-off is more false positives. That is why a high score leads to a sleep study rather than straight to treatment, and why taking a second screener like NoSAS or Berlin can help.
Where can I find the STOP-Bang questionnaire?
The official version is published by the University Health Network at stopbang.ca, and many clinics use it. It is free for non-commercial use, and we do not reproduce it on this site. Your clinician can also give it to you and add up the total.
Should I retake STOP-Bang once I'm on CPAP?
It will not tell you how well therapy is working, because most items, such as age, neck size and sex, do not change with treatment. Once you are on CPAP, residual AHI, usage and leak are the numbers to watch, along with how sleepy you feel day to day.
Diagnosed and on CPAP? See if it's working.
Apnealytics reads your machine's SD card and shows residual AHI, leak and usage every night. Your first 30 nights are free.
Screening tool, not a diagnosis. A result here cannot tell you whether you have sleep apnea, insomnia or any other condition — only a licensed clinician can diagnose. If you are very sleepy during the day or have dozed while driving, see a doctor promptly.
