Score	Risk Category	Peri-operative Event % (OR)	Risk of Obstructive Sleep Apnea (OSA) in Obese Pre-Op Patients
0 - 2	Normal Risk	6% (1)	100% Negative Predictive Value for severe OSA
3	Increased Risk	20% (4)	Half of obese patients have moderate or severe OSA
4 - 5	Likely OSA	30% (5)	About 2/3 of obese patients in this range have moderate or severe OSA
≥ 6	Likely severe OSA	40% (6)	Half of obese patients in this range have severe OSA

Some considerations for appropriate patient selection and results interpretation:

Caution: The STOP-Bang has low specificity (30%) and low positive predictive values (10%) in the general population, when BMI under 35.
A score of 3 or higher is highly sensitive (90%) for OSA in obese pre-operative patients (68% prevalence) and sleep study patients (85% prevalence) but is not specific (50%).
Scores in pre-operative patients correlate with increased unexpected intra-operative and early post-operative adverse events. Study rates above may not reflect your population.
Neither STOP-Bang nor nocturnal oximetry are diagnostic for OSA. Avoid changing management with discordant results.
If the STOP-Bang is high in an obese patient a negative nocturnal oximetry will not reliably reassure.
Similarly a low risk patient should not get nocturnal oximetry as false positives are likely.

Reference: Chung F, Yang Y, Liao P. Predictive Performance of the STOP-Bang Score for Identifying Obstructive Sleep Apnea in Obese Patients OBES SURG (2013) 23:2050-2057 DOI 10.1007/s11695-013-1006-z
Reference: Nagappa M, Liao P, Wong J, et al. Validation of the STOP-Bang Questionnaire as a Screening Tool for Obstructive Sleep Apnea among Different Populations: A Systematic Review and Meta-Analysis. PLoS One. 2015;10(12):e0143697. Published 2015 Dec 14. doi:10.1371/journal.pone.0143697
Reference: Seet E, Chua M, Liaw CM. High STOP-BANG questionnaire scores predict intraoperative and early postoperative adverse events. Singapore Med J. 2015;56(4):212-6.

A. Please answer the following questions below to determine if you might be at risk of Sleep Apnea	No (0)	Yes (1)
Snoring ? Do you Snore Loudly (loud enough to be heard through closed doors or your bed-partner elbows you for snoring at night)?
Tired ? Do you often feel Tired, Fatigued, or Sleepy during the daytime (such as falling asleep during driving or talking to someone)?
Observed ? Has anyone Observed you Stop Breathing or Choking/Gasping during your sleep ?
Pressure ? Do you have or are being treated for High Blood Pressure ?
Body Mass Index more than 35 kg/m²? Weight: kg Height: cm This patient has BMI < 35. The STOP-BANG score may not be valid. See Notes below.
Age older than 50 ?
Neck size large ? (Measured around Adams apple) For male, is your shirt collar 17 inches / 43cm or larger? For female, is your shirt collar 16 inches / 41cm or larger?
Gender = Male ?
STOP-Bang Score:

Patient name
Date