# STOP-Bang OSA screen STOP-Bang Status: LIVE Price: $0.005 USDC `GET /api/calc/stop_bang` HTML: https://magentlab.com/docs/stop-bang Markdown: https://magentlab.com/docs/stop-bang.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Compute Chung 2008 Appendix 2 STOP-Bang from four STOP flags and computed BANG (BMI >35, age >50, neck >40 cm, male) and return the published 0-2 / >=3 OSA-risk band. ## When to use When an agent needs the published Chung 2008 STOP-Bang total and two-tier band and must not invent a sleep-study order or the Chung 2012 three-tier scheme. ## When not to use - Not a medical device. magent does not diagnose obstructive sleep apnea. - Not a sleep-study (polysomnography) order and not an airway-management protocol. - This is Chung 2008 Appendix 2 STOP-Bang with two bands (yes to fewer than three items = 0-2; yes to three or more = >=3). It is not the Chung 2012 three-tier 0-2 / 3-4 / 5-8 scheme. - BANG items are computed from bmi_kg_m2, age, neck_cm, and sex. magent does not accept BANG as caller flags. - BMI 35, age 50, and neck 40 cm do not score (strict greater-than). Percents and AHI sensitivities are not returned. ## Formula ``` STOP-Bang = snoring + tired + observed_apnea + hypertension + (bmi_kg_m2>35) + (age>50) + (neck_cm>40) + male; each 1 if true; max 8; bands 0-2 / >=3 ``` ## Citation [STOP questionnaire: a tool to screen patients for obstructive sleep apnea](https://doi.org/10.1097/ALN.0b013e31816d83e4) Chung F, Yegneswaran B, Liao P, et al. Anesthesiology. 2008;108(5):812-821 DOI: [10.1097/ALN.0b013e31816d83e4](https://doi.org/10.1097/ALN.0b013e31816d83e4) ## Worked example ### All STOP false, BMI 30, age 40, neck 38 cm, female Given: `age=40, bmi_kg_m2=30, hypertension=false, neck_cm=38, observed_apnea=false, sex=female, snoring=false, tired=false` 1. STOP all false → 0; BMI 30 is not >35 → 0; age 40 is not >50 → 0; neck 38 is not >40 → 0; female → 0 2. Score = 0 (max 8); stop_bang_band 0-2 ### Three STOP items true Given: `age=40, bmi_kg_m2=30, hypertension=false, neck_cm=38, observed_apnea=true, sex=female, snoring=true, tired=true` 1. snoring → 1; tired → 1; observed_apnea → 1; remaining items 0 2. Score = 3 (max 8); stop_bang_band >=3 ## Also searched as - STOP-Bang - STOP Bang - Chung STOP-Bang - OSA screening STOP-Bang - obstructive sleep apnea STOP-Bang - STOP questionnaire Bang ## Parameters - `snoring` (boolean, required): Loud snoring heard through closed doors (Chung 2008 Appendix 2 STOP). true or false. Caller-assigned. 1 point if true. - `tired` (boolean, required): Daytime tiredness, fatigue, or sleepiness (Chung 2008 Appendix 2 STOP). true or false. Caller-assigned. 1 point if true. - `observed_apnea` (boolean, required): Anyone observed the patient stop breathing during sleep (Chung 2008 Appendix 2 STOP). true or false. Caller-assigned. 1 point if true. - `hypertension` (boolean, required): Has or is being treated for high blood pressure (Chung 2008 Appendix 2 STOP). true or false. Caller-assigned. 1 point if true. - `bmi_kg_m2` (number, required): Body-mass index in kg/m^2 (10-80). Chung 2008 Appendix 2 BANG: scores 1 when >35. BMI 35 does not score. Caller-supplied; magent does not compute BMI from height and weight. - `age` (integer, required): Age in years (18-120). Chung 2008 Appendix 2 BANG: scores 1 when >50. Age 50 does not score. - `neck_cm` (number, required): Neck circumference in cm (20-80). Chung 2008 Appendix 2 BANG: scores 1 when >40. Neck 40 does not score. - `sex` (string, required): female or male. Chung 2008 Appendix 2 BANG: male scores 1. Female scores 0. ## Bulk (POST) POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement. Method: `POST /api/calc/stop_bang` Max items: 25 Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic) Status: PREVIEW - 1 to 25 items. Each item uses the same keys as the GET query parameters. - POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows. - The first invalid item fails the whole request (index in the 400 JSON). You are not charged. - HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row. - Catalog misses (empty matches, found=false) stay paid 200s inside that slot. - x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items. Example request: ```json { "items": [ { "age": "40", "bmi_kg_m2": "30", "hypertension": "false", "neck_cm": "38", "observed_apnea": "false", "sex": "female", "snoring": "false", "tired": "false" }, { "age": "40", "bmi_kg_m2": "30", "hypertension": "false", "neck_cm": "38", "observed_apnea": "false", "sex": "female", "snoring": "false", "tired": "false" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/stop-bang Example 200: ```json { "count": 2, "path": "/api/calc/stop_bang", "items": [ { "components": [ { "factor": "snoring", "points": 0, "present": false }, { "factor": "tired", "points": 0, "present": false }, { "factor": "observed_apnea", "points": 0, "present": false }, { "factor": "hypertension", "points": 0, "present": false }, { "value": 30.0, "factor": "bmi_gt_35", "points": 0, "present": false }, { "value": 40, "factor": "age_gt_50", "points": 0, "present": false }, { "value": 38.0, "factor": "neck_gt_40", "points": 0, "present": false }, { "factor": "male", "points": 0, "present": false } ], "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "Chung F, Yegneswaran B, Liao P, et al.", "doi": "10.1097/ALN.0b013e31816d83e4", "id": "chung-2008", "pmid": "18431116", "source": "Anesthesiology. 2008;108(5):812-821", "title": "STOP questionnaire: a tool to screen patients for obstructive sleep apnea" }, "formula": "stop_bang", "formula_expression": "STOP-Bang = snoring + tired + observed_apnea + hypertension + (bmi_kg_m2>35) + (age>50) + (neck_cm>40) + male; each 1 if true; max 8; bands 0-2 / >=3", "max_score": 8, "score": 0, "age_years": 40, "sex": "female", "bmi_kg_m2": 30.0, "hypertension": false, "neck_cm": 38.0, "observed_apnea": false, "snoring": false, "stop_bang_band": "0-2", "tired": false }, { "components": [ { "factor": "snoring", "points": 0, "present": false }, { "factor": "tired", "points": 0, "present": false }, { "factor": "observed_apnea", "points": 0, "present": false }, { "factor": "hypertension", "points": 0, "present": false }, { "value": 30.0, "factor": "bmi_gt_35", "points": 0, "present": false }, { "value": 40, "factor": "age_gt_50", "points": 0, "present": false }, { "value": 38.0, "factor": "neck_gt_40", "points": 0, "present": false }, { "factor": "male", "points": 0, "present": false } ], "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "Chung F, Yegneswaran B, Liao P, et al.", "doi": "10.1097/ALN.0b013e31816d83e4", "id": "chung-2008", "pmid": "18431116", "source": "Anesthesiology. 2008;108(5):812-821", "title": "STOP questionnaire: a tool to screen patients for obstructive sleep apnea" }, "formula": "stop_bang", "formula_expression": "STOP-Bang = snoring + tired + observed_apnea + hypertension + (bmi_kg_m2>35) + (age>50) + (neck_cm>40) + male; each 1 if true; max 8; bands 0-2 / >=3", "max_score": 8, "score": 0, "age_years": 40, "sex": "female", "bmi_kg_m2": 30.0, "hypertension": false, "neck_cm": 38.0, "observed_apnea": false, "snoring": false, "stop_bang_band": "0-2", "tired": false } ] } ``` ## Response fields - `formula` (string): stop_bang - `formula_expression` (string): Exact expression used - `score` (integer): STOP-Bang points 0-8 - `max_score` (integer): 8 - `stop_bang_band` (string): Chung 2008 Appendix 2 OSA-risk band: 0-2 (yes to fewer than three items) or >=3 (yes to three or more). Not Chung 2012 0-2/3-4/5-8. Percents are not returned. - `snoring` (boolean): STOP snoring flag used - `tired` (boolean): STOP tired flag used - `observed_apnea` (boolean): STOP observed-apnea flag used - `hypertension` (boolean): STOP hypertension flag used - `bmi_kg_m2` (number): BMI used for the >35 criterion - `age_years` (integer): Age used for the >50 criterion - `neck_cm` (number): Neck circumference used for the >40 criterion - `sex` (string): female or male - `components` (array): Per-item points - `citation` (object): Chung 2008 Anesthesiology citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "factor": "snoring", "points": 0, "present": false }, { "factor": "tired", "points": 0, "present": false }, { "factor": "observed_apnea", "points": 0, "present": false }, { "factor": "hypertension", "points": 0, "present": false }, { "value": 30.0, "factor": "bmi_gt_35", "points": 0, "present": false }, { "value": 40, "factor": "age_gt_50", "points": 0, "present": false }, { "value": 38.0, "factor": "neck_gt_40", "points": 0, "present": false }, { "factor": "male", "points": 0, "present": false } ], "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "Chung F, Yegneswaran B, Liao P, et al.", "doi": "10.1097/ALN.0b013e31816d83e4", "id": "chung-2008", "pmid": "18431116", "source": "Anesthesiology. 2008;108(5):812-821", "title": "STOP questionnaire: a tool to screen patients for obstructive sleep apnea" }, "formula": "stop_bang", "formula_expression": "STOP-Bang = snoring + tired + observed_apnea + hypertension + (bmi_kg_m2>35) + (age>50) + (neck_cm>40) + male; each 1 if true; max 8; bands 0-2 / >=3", "max_score": 8, "score": 0, "age_years": 40, "sex": "female", "bmi_kg_m2": 30.0, "hypertension": false, "neck_cm": 38.0, "observed_apnea": false, "snoring": false, "stop_bang_band": "0-2", "tired": false } ``` ## Errors - HTTP 400 `invalid_flag`: boolean clinical flags must be true or false Returned before settlement; you are not charged. - HTTP 400 `invalid_bmi_kg_m2`: bmi_kg_m2 must be a number from 10 to 80. Returned before settlement; you are not charged. - HTTP 400 `invalid_age`: age must be an integer from 18 to 120 Returned before settlement; you are not charged. - HTTP 400 `invalid_neck_cm`: neck_cm must be a number from 20 to 80 (Chung 2008 STOP-Bang). Returned before settlement; you are not charged. - HTTP 400 `invalid_sex`: sex must be female or male Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - [BODE](https://magentlab.com/docs/bode) — Sum Celli 2004 BODE points from BMI, FEV1 percent predicted, MMRC dyspnea, and 6-minute walk distance. - [DECAF](https://magentlab.com/docs/decaf) — Sum Steer 2012 DECAF points from extended MRC dyspnoea, eosinophils, chest radiograph consolidation, arterial pH, and atrial fibrillation. ## Payment Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON echoing accepted, payload, and extensions when present). - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/docs/mcp ## Guarantees - HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. - exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE. - HTTP 402 is unpaid only. Do not sign a second authorization because of a 503. - Execution is timeout-bounded and concurrency-capped. - Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.