Free STOP-BANG Calculator | OSA Screening Tool

The STOP-BANG questionnaire offers a rapid, structured method for assessing an individual’s risk of obstructive sleep apnea (OSA). By concentrating on eight distinct risk factors and clinical signs, this screening tool helps determine whether more advanced diagnostic testing—such as overnight polysomnography—may be warranted. Used in primary care visits, pre‑operative evaluations, and even self‑assessment, the STOP‑BANG test is recognized for its convenience and evidence‑based design.

Understanding Sleep Apnea

Sleep apnea is a disorder characterized by recurring interruptions in breathing during sleep. These episodes can disrupt sleep quality, lower blood oxygen levels, and, if left untreated, contribute to serious conditions like hypertension, stroke, and heart disease. There are three primary forms:

• Obstructive sleep apnea (OSA): the most common subtype, resulting from the collapse or relaxation of the pharyngeal muscles, which blocks the airway even though the respiratory muscles are active.
• Central sleep apnea (CSA): caused by a failure of the brain’s respiratory control centers to send proper signals to the breathing muscles; in this case no physical obstruction is present.
• Mixed (complex) sleep apnea: a combination of both obstructive and central features.

The STOP‑BANG questionnaire is specifically designed to screen for OSA, the predominant type.

Screening for OSA

Multiple instruments have been developed to estimate sleep apnea risk. The STOP‑BANG score calculator (also referred to as an OSA risk calculator) is among the most widely adopted, valued for its strong sensitivity in detecting moderate‑to‑severe OSA and its straightforward administration. Other screening tools, including the Epworth Sleepiness Scale (adult and pediatric versions) and the Berlin Questionnaire, can complement risk assessment, but the STOP‑BANG is often recommended as a starting point because of its concise, objective criteria.

Components of the STOP‑BANG Score

The name STOP‑BANG is an acronym derived from eight yes‑no questions. Each affirmative answer adds one point to the total score. The items are:

• S (Snoring): The individual’s snoring is loud enough to be heard by others, including a bed partner.
• T (Tiredness): Frequent daytime fatigue, sleepiness, or episodes of unintentional napping.
• O (Observed apnea): Witnessed pauses in breathing, gasping, or choking sounds during sleep.
• P (Pressure): High blood pressure (≥140/90 mm Hg) or current treatment for hypertension.
• B (BMI): Body mass index of 35 kg/m² or higher.
• A (Age): Age greater than 50 years.
• N (Neck circumference): Neck size measuring at least 17 in (43 cm) for men or 16 in (41 cm) for women.
• G (Gender): Male sex (a recognized risk factor for OSA).

Summing the “yes” responses produces a total STOP‑BANG score that ranges from 0 to 8.

Using the STOP‑BANG Screening Test

To complete the screening, answer each question with a simple yes or no based on current symptoms and personal history. The total score offers a snapshot of OSA risk and can help guide conversations about further evaluation. This instrument is not a substitute for a professional medical diagnosis. A healthcare provider should review the results and decide whether a formal sleep study (polysomnography) is necessary. If you or someone you know shows signs of sleep apnea, consulting a physician or sleep specialist is strongly advised.