# Duke Activity Status Index DASI Status: LIVE Price: $0.005 USDC `GET /api/calc/dasi` HTML: https://magentlab.com/docs/dasi Markdown: https://magentlab.com/docs/dasi.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Sum the Hlatky 1989 Duke Activity Status Index Table I weights for 12 yes/no activities and return DASI and estimated peak VO2. ## When to use When an agent has caller-assigned yes/no replies to the twelve Hlatky 1989 DASI activities and needs the published weighted sum and VO2peak regression, not an exercise test or a functional-capacity assignment. ## When not to use - Not a medical device. magent does not observe the patient. - Not a functional-capacity assignment, exercise-test replacement, or cardiopulmonary exercise prescription. - Yes/no replies are caller-assigned from the Hlatky 1989 Table I questionnaire. magent does not interview the patient or measure oxygen uptake. - This is the Hlatky 1989 questionnaire sum and VO2peak = 0.43 x DASI + 9.6 regression only. It does not convert VO2peak to METs and does not apply a later perioperative functional-capacity cutoff. ## Formula ``` DASI = 2.75*self_care + 1.75*walk_indoors + 2.75*walk_blocks + 5.50*climb_stairs + 8.00*run_short + 2.70*light_housework + 3.50*moderate_housework + 8.00*heavy_housework + 4.50*yardwork + 5.25*sexual_relations + 6.00*moderate_recreation + 7.50*strenuous_sports (Yes = weight, No = 0); VO2peak_mL/kg/min = 0.43*DASI + 9.6 (Hlatky 1989 Table I) ``` ## Citation [A brief self-administered questionnaire to determine functional capacity (The Duke Activity Status Index)](https://doi.org/10.1016/0002-9149(89)90496-7) Hlatky MA, Boineau RE, Higginbotham MB, Lee KL, Mark DB, Califf RM, Cobb FR, Pryor DB Am J Cardiol. 1989;64(10):651-654 DOI: [10.1016/0002-9149(89)90496-7](https://doi.org/10.1016/0002-9149(89)90496-7) ## Worked example ### All 12 activities false Given: `climb_stairs=false, heavy_housework=false, light_housework=false, moderate_housework=false, moderate_recreation=false, run_short=false, self_care=false, sexual_relations=false, strenuous_sports=false, walk_blocks=false, walk_indoors=false, yardwork=false` 1. Each No adds 0 2. DASI = 0.0 (max 58.2) 3. VO2peak = 0.43 * 0.0 + 9.6 = 9.6 mL/kg/min ### All 12 activities true Given: `climb_stairs=true, heavy_housework=true, light_housework=true, moderate_housework=true, moderate_recreation=true, run_short=true, self_care=true, sexual_relations=true, strenuous_sports=true, walk_blocks=true, walk_indoors=true, yardwork=true` 1. Sum of Table I weights = 58.2 (light housework is 2.70) 2. DASI = 58.2 (max 58.2) 3. VO2peak = 0.43 * 58.2 + 9.6 = 34.6 mL/kg/min ## Also searched as - Duke Activity Status Index - DASI - Duke Activity Status - Hlatky DASI - DASI questionnaire - DASI VO2peak - functional capacity index - Duke activity questionnaire ## Parameters - `self_care` (boolean, required): Can take care of self: eating, dressing, bathing, or using the toilet (Hlatky 1989 Table I). true or false. Yes adds 2.75. - `walk_indoors` (boolean, required): Can walk indoors, such as around the house (Hlatky 1989 Table I). true or false. Yes adds 1.75. - `walk_blocks` (boolean, required): Can walk a block or two on level ground (Hlatky 1989 Table I). true or false. Yes adds 2.75. - `climb_stairs` (boolean, required): Can climb a flight of stairs or walk up a hill (Hlatky 1989 Table I). true or false. Yes adds 5.50. - `run_short` (boolean, required): Can run a short distance (Hlatky 1989 Table I). true or false. Yes adds 8.00. - `light_housework` (boolean, required): Can do light work around the house like dusting or washing dishes (Hlatky 1989 Table I). true or false. Yes adds 2.70. - `moderate_housework` (boolean, required): Can do moderate work around the house like vacuuming, sweeping floors, or carrying in groceries (Hlatky 1989 Table I). true or false. Yes adds 3.50. - `heavy_housework` (boolean, required): Can do heavy work around the house like scrubbing floors, or lifting or moving heavy furniture (Hlatky 1989 Table I). true or false. Yes adds 8.00. - `yardwork` (boolean, required): Can do yardwork like raking leaves, weeding, or pushing a power mower (Hlatky 1989 Table I). true or false. Yes adds 4.50. - `sexual_relations` (boolean, required): Can have sexual relations (Hlatky 1989 Table I). true or false. Yes adds 5.25. - `moderate_recreation` (boolean, required): Can participate in moderate recreational activities like golf, bowling, dancing, doubles tennis, or throwing a baseball or football (Hlatky 1989 Table I). true or false. Yes adds 6.00. - `strenuous_sports` (boolean, required): Can participate in strenuous sports like swimming, singles tennis, football, basketball, or skiing (Hlatky 1989 Table I). true or false. Yes adds 7.50. ## 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/dasi` 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": [ { "climb_stairs": "false", "heavy_housework": "false", "light_housework": "false", "moderate_housework": "false", "moderate_recreation": "false", "run_short": "false", "self_care": "false", "sexual_relations": "false", "strenuous_sports": "false", "walk_blocks": "false", "walk_indoors": "false", "yardwork": "false" }, { "climb_stairs": "false", "heavy_housework": "false", "light_housework": "false", "moderate_housework": "false", "moderate_recreation": "false", "run_short": "false", "self_care": "false", "sexual_relations": "false", "strenuous_sports": "false", "walk_blocks": "false", "walk_indoors": "false", "yardwork": "false" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/dasi Example 200: ```json { "count": 2, "path": "/api/calc/dasi", "items": [ { "components": [ { "factor": "self_care", "points": 0.0, "present": false }, { "factor": "walk_indoors", "points": 0.0, "present": false }, { "factor": "walk_blocks", "points": 0.0, "present": false }, { "factor": "climb_stairs", "points": 0.0, "present": false }, { "factor": "run_short", "points": 0.0, "present": false }, { "factor": "light_housework", "points": 0.0, "present": false }, { "factor": "moderate_housework", "points": 0.0, "present": false }, { "factor": "heavy_housework", "points": 0.0, "present": false }, { "factor": "yardwork", "points": 0.0, "present": false }, { "factor": "sexual_relations", "points": 0.0, "present": false }, { "factor": "moderate_recreation", "points": 0.0, "present": false }, { "factor": "strenuous_sports", "points": 0.0, "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": "Hlatky MA, Boineau RE, Higginbotham MB, Lee KL, Mark DB, Califf RM, Cobb FR, Pryor DB", "doi": "10.1016/0002-9149(89)90496-7", "id": "hlatky-1989", "pmid": "2782256", "source": "Am J Cardiol. 1989;64(10):651-654", "title": "A brief self-administered questionnaire to determine functional capacity (The Duke Activity Status Index)" }, "formula": "dasi", "formula_expression": "DASI = 2.75*self_care + 1.75*walk_indoors + 2.75*walk_blocks + 5.50*climb_stairs + 8.00*run_short + 2.70*light_housework + 3.50*moderate_housework + 8.00*heavy_housework + 4.50*yardwork + 5.25*sexual_relations + 6.00*moderate_recreation + 7.50*strenuous_sports (Yes = weight, No = 0); VO2peak_mL/kg/min = 0.43*DASI + 9.6 (Hlatky 1989 Table I)", "max_score": 58.2, "score": 0.0, "dasi": 0.0, "vo2peak_ml_kg_min": 9.6 }, { "components": [ { "factor": "self_care", "points": 0.0, "present": false }, { "factor": "walk_indoors", "points": 0.0, "present": false }, { "factor": "walk_blocks", "points": 0.0, "present": false }, { "factor": "climb_stairs", "points": 0.0, "present": false }, { "factor": "run_short", "points": 0.0, "present": false }, { "factor": "light_housework", "points": 0.0, "present": false }, { "factor": "moderate_housework", "points": 0.0, "present": false }, { "factor": "heavy_housework", "points": 0.0, "present": false }, { "factor": "yardwork", "points": 0.0, "present": false }, { "factor": "sexual_relations", "points": 0.0, "present": false }, { "factor": "moderate_recreation", "points": 0.0, "present": false }, { "factor": "strenuous_sports", "points": 0.0, "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": "Hlatky MA, Boineau RE, Higginbotham MB, Lee KL, Mark DB, Califf RM, Cobb FR, Pryor DB", "doi": "10.1016/0002-9149(89)90496-7", "id": "hlatky-1989", "pmid": "2782256", "source": "Am J Cardiol. 1989;64(10):651-654", "title": "A brief self-administered questionnaire to determine functional capacity (The Duke Activity Status Index)" }, "formula": "dasi", "formula_expression": "DASI = 2.75*self_care + 1.75*walk_indoors + 2.75*walk_blocks + 5.50*climb_stairs + 8.00*run_short + 2.70*light_housework + 3.50*moderate_housework + 8.00*heavy_housework + 4.50*yardwork + 5.25*sexual_relations + 6.00*moderate_recreation + 7.50*strenuous_sports (Yes = weight, No = 0); VO2peak_mL/kg/min = 0.43*DASI + 9.6 (Hlatky 1989 Table I)", "max_score": 58.2, "score": 0.0, "dasi": 0.0, "vo2peak_ml_kg_min": 9.6 } ] } ``` ## Response fields - `formula` (string): dasi - `formula_expression` (string): Exact expression used - `score` (number): DASI (same as dasi); 0-58.2 - `max_score` (number): 58.2 - `dasi` (number): Hlatky 1989 Table I weighted sum (0-58.2) - `vo2peak_ml_kg_min` (number): Estimated peak VO2 in mL/kg/min = 0.43 * DASI + 9.6 - `components` (array): Per-activity Table I weights - `citation` (object): Hlatky et al. Am J Cardiol 1989 citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "factor": "self_care", "points": 0.0, "present": false }, { "factor": "walk_indoors", "points": 0.0, "present": false }, { "factor": "walk_blocks", "points": 0.0, "present": false }, { "factor": "climb_stairs", "points": 0.0, "present": false }, { "factor": "run_short", "points": 0.0, "present": false }, { "factor": "light_housework", "points": 0.0, "present": false }, { "factor": "moderate_housework", "points": 0.0, "present": false }, { "factor": "heavy_housework", "points": 0.0, "present": false }, { "factor": "yardwork", "points": 0.0, "present": false }, { "factor": "sexual_relations", "points": 0.0, "present": false }, { "factor": "moderate_recreation", "points": 0.0, "present": false }, { "factor": "strenuous_sports", "points": 0.0, "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": "Hlatky MA, Boineau RE, Higginbotham MB, Lee KL, Mark DB, Califf RM, Cobb FR, Pryor DB", "doi": "10.1016/0002-9149(89)90496-7", "id": "hlatky-1989", "pmid": "2782256", "source": "Am J Cardiol. 1989;64(10):651-654", "title": "A brief self-administered questionnaire to determine functional capacity (The Duke Activity Status Index)" }, "formula": "dasi", "formula_expression": "DASI = 2.75*self_care + 1.75*walk_indoors + 2.75*walk_blocks + 5.50*climb_stairs + 8.00*run_short + 2.70*light_housework + 3.50*moderate_housework + 8.00*heavy_housework + 4.50*yardwork + 5.25*sexual_relations + 6.00*moderate_recreation + 7.50*strenuous_sports (Yes = weight, No = 0); VO2peak_mL/kg/min = 0.43*DASI + 9.6 (Hlatky 1989 Table I)", "max_score": 58.2, "score": 0.0, "dasi": 0.0, "vo2peak_ml_kg_min": 9.6 } ``` ## Errors - HTTP 400 `invalid_flag`: boolean clinical flags must be true or false 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 - [H2FPEF](https://magentlab.com/docs/h2fpef) — Sum the Reddy 2018 H2FPEF points score (six components, max 9) and return score and max_score only. ## 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 of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional. - 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. HTTP 402 never includes the tool JSON. - 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.