# BODE index BODE Status: LIVE Price: $0.005 USDC `GET /api/calc/bode` HTML: https://magentlab.com/docs/bode Markdown: https://magentlab.com/docs/bode.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Sum Celli 2004 BODE points from BMI, FEV1 percent predicted, MMRC dyspnea, and 6-minute walk distance. ## When to use When an agent needs the published Celli 2004 BODE total and quartile and must not invent a GOLD stage or listing decision. ## When not to use - Not a GOLD COPD stage and not a transplant listing protocol. Quartiles follow Celli 2004 (0-2 / 3-4 / 5-6 / 7-10). - BMI is caller-supplied kg/m^2. magent does not compute BMI from height and weight. - MMRC is the caller-assigned modified Medical Research Council grade 0-4. magent does not interview the patient. ## Formula ``` BODE = bmi_points + fev1_points + mmrc_points + walk_points; BMI <=21 -> 1 else 0; FEV1% >=65 -> 0, 50-64 -> 1, 36-49 -> 2, <=35 -> 3; MMRC 0-1 -> 0, 2 -> 1, 3 -> 2, 4 -> 3; 6MWD m >=350 -> 0, 250-349 -> 1, 150-249 -> 2, <=149 -> 3; quartiles 0-2 / 3-4 / 5-6 / 7-10; max 10 ``` ## Citation [The body-mass index, airflow obstruction, dyspnea, and exercise capacity index in chronic obstructive pulmonary disease](https://doi.org/10.1056/NEJMoa021322) Celli BR, Cote CG, Marin JM, et al. N Engl J Med. 2004;350(10):1005-1012 DOI: [10.1056/NEJMoa021322](https://doi.org/10.1056/NEJMoa021322) ## Worked example ### All 0-point bands (quartile 1) Given: `bmi_kg_m2=24, fev1_percent_predicted=70, mmrc=0, six_minute_walk_m=400` 1. BMI 24 >21 → 0; FEV1 70% ≥65 → 0; MMRC 0 → 0; 6MWD 400 m ≥350 → 0 2. Score = 0; quartile 1 ### Maximum points (quartile 4) Given: `bmi_kg_m2=21, fev1_percent_predicted=20, mmrc=4, six_minute_walk_m=100` 1. BMI 21 ≤21 → 1; FEV1 20% ≤35 → 3; MMRC 4 → 3; 6MWD 100 m ≤149 → 3 2. Score = 10; quartile 4 ## Also searched as - BODE index - BODE score - Celli BODE - BMI obstruction dyspnea exercise - COPD BODE - 6-minute walk BODE - MMRC BODE ## Parameters - `bmi_kg_m2` (number, required): Body-mass index in kg/m^2 (10-80). Caller-supplied; magent does not compute BMI from height and weight. Celli 2004: >21 scores 0; <=21 scores 1. - `fev1_percent_predicted` (number, required): FEV1 percent predicted (10-150). Celli 2004 Table 2: >=65 scores 0; 50-64 scores 1; 36-49 scores 2; <=35 scores 3. - `mmrc` (integer, required): Modified Medical Research Council dyspnea grade as an integer 0-4 (Celli 2004). 0-1 scores 0; 2 scores 1; 3 scores 2; 4 scores 3. magent does not interview the patient. - `six_minute_walk_m` (number, required): Six-minute walk distance in meters (0-1000). Celli 2004 Table 2: >=350 scores 0; 250-349 scores 1; 150-249 scores 2; <=149 scores 3. ## 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/bode` 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": [ { "bmi_kg_m2": "24", "fev1_percent_predicted": "70", "mmrc": "0", "six_minute_walk_m": "400" }, { "bmi_kg_m2": "24", "fev1_percent_predicted": "70", "mmrc": "0", "six_minute_walk_m": "400" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/bode Example 200: ```json { "count": 2, "path": "/api/calc/bode", "items": [ { "components": [ { "value": 24.0, "factor": "bmi", "points": 0, "present": false }, { "value": 70.0, "factor": "fev1", "points": 0, "present": false }, { "value": 0, "factor": "mmrc", "points": 0, "present": false }, { "value": 400.0, "factor": "six_minute_walk", "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": "Celli BR, Cote CG, Marin JM, et al.", "doi": "10.1056/NEJMoa021322", "id": "celli-2004", "pmid": "14999112", "source": "N Engl J Med. 2004;350(10):1005-1012", "title": "The body-mass index, airflow obstruction, dyspnea, and exercise capacity index in chronic obstructive pulmonary disease" }, "formula": "bode", "formula_expression": "BODE = bmi_points + fev1_points + mmrc_points + walk_points; BMI <=21 -> 1 else 0; FEV1% >=65 -> 0, 50-64 -> 1, 36-49 -> 2, <=35 -> 3; MMRC 0-1 -> 0, 2 -> 1, 3 -> 2, 4 -> 3; 6MWD m >=350 -> 0, 250-349 -> 1, 150-249 -> 2, <=149 -> 3; quartiles 0-2 / 3-4 / 5-6 / 7-10; max 10", "max_score": 10, "score": 0, "bmi_kg_m2": 24.0, "fev1_percent_predicted": 70.0, "mmrc": 0, "quartile": 1, "six_minute_walk_m": 400.0 }, { "components": [ { "value": 24.0, "factor": "bmi", "points": 0, "present": false }, { "value": 70.0, "factor": "fev1", "points": 0, "present": false }, { "value": 0, "factor": "mmrc", "points": 0, "present": false }, { "value": 400.0, "factor": "six_minute_walk", "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": "Celli BR, Cote CG, Marin JM, et al.", "doi": "10.1056/NEJMoa021322", "id": "celli-2004", "pmid": "14999112", "source": "N Engl J Med. 2004;350(10):1005-1012", "title": "The body-mass index, airflow obstruction, dyspnea, and exercise capacity index in chronic obstructive pulmonary disease" }, "formula": "bode", "formula_expression": "BODE = bmi_points + fev1_points + mmrc_points + walk_points; BMI <=21 -> 1 else 0; FEV1% >=65 -> 0, 50-64 -> 1, 36-49 -> 2, <=35 -> 3; MMRC 0-1 -> 0, 2 -> 1, 3 -> 2, 4 -> 3; 6MWD m >=350 -> 0, 250-349 -> 1, 150-249 -> 2, <=149 -> 3; quartiles 0-2 / 3-4 / 5-6 / 7-10; max 10", "max_score": 10, "score": 0, "bmi_kg_m2": 24.0, "fev1_percent_predicted": 70.0, "mmrc": 0, "quartile": 1, "six_minute_walk_m": 400.0 } ] } ``` ## Response fields - `formula` (string): bode - `formula_expression` (string): Exact Celli 2004 expression - `score` (integer): BODE points 0-10 - `max_score` (integer): Always 10 - `quartile` (integer): Celli 2004 quartile 1 (0-2), 2 (3-4), 3 (5-6), or 4 (7-10). Not a GOLD stage. - `bmi_kg_m2` (number): Caller-supplied BMI in kg/m^2 - `fev1_percent_predicted` (number): FEV1 percent predicted used - `mmrc` (integer): Caller-assigned MMRC grade 0-4 - `six_minute_walk_m` (number): Six-minute walk distance in meters - `components` (array): Per-factor points for bmi, fev1, mmrc, and six_minute_walk - `citation` (object): Celli et al. NEJM 2004 citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "value": 24.0, "factor": "bmi", "points": 0, "present": false }, { "value": 70.0, "factor": "fev1", "points": 0, "present": false }, { "value": 0, "factor": "mmrc", "points": 0, "present": false }, { "value": 400.0, "factor": "six_minute_walk", "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": "Celli BR, Cote CG, Marin JM, et al.", "doi": "10.1056/NEJMoa021322", "id": "celli-2004", "pmid": "14999112", "source": "N Engl J Med. 2004;350(10):1005-1012", "title": "The body-mass index, airflow obstruction, dyspnea, and exercise capacity index in chronic obstructive pulmonary disease" }, "formula": "bode", "formula_expression": "BODE = bmi_points + fev1_points + mmrc_points + walk_points; BMI <=21 -> 1 else 0; FEV1% >=65 -> 0, 50-64 -> 1, 36-49 -> 2, <=35 -> 3; MMRC 0-1 -> 0, 2 -> 1, 3 -> 2, 4 -> 3; 6MWD m >=350 -> 0, 250-349 -> 1, 150-249 -> 2, <=149 -> 3; quartiles 0-2 / 3-4 / 5-6 / 7-10; max 10", "max_score": 10, "score": 0, "bmi_kg_m2": 24.0, "fev1_percent_predicted": 70.0, "mmrc": 0, "quartile": 1, "six_minute_walk_m": 400.0 } ``` ## Errors - 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_fev1_percent`: fev1_percent_predicted must be a number from 10 to 150. Returned before settlement; you are not charged. - HTTP 400 `invalid_mmrc`: mmrc must be an integer from 0 to 4 (Celli 2004 MMRC). Returned before settlement; you are not charged. - HTTP 400 `invalid_six_minute_walk_m`: six_minute_walk_m must be a number from 0 to 1000. 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 - [Peak expiratory flow](https://magentlab.com/docs/peak-expiratory-flow) — Compute Nunn and Gregg 1989 predicted peak expiratory flow in L/min from age, sex, and height. - [PaO2/FiO2 ratio](https://magentlab.com/docs/pf-ratio) — Compute the PaO2/FiO2 ratio as arterial PO2 in mm Hg divided by inspired oxygen fraction. ## 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.