# Braden Scale (Bergstrom) Braden Scale Status: LIVE Price: $0.005 USDC `GET /api/calc/braden` HTML: https://magentlab.com/docs/braden Markdown: https://magentlab.com/docs/braden.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Sum six caller-assigned Bergstrom 1987 Braden Scale subscale points and return at_risk when the total is ≤16. ## When to use When an agent has already assigned published Bergstrom 1987 subscale points and needs the 6-23 total and that paper's cutoff-16 at-risk flag. magent does not examine the patient or diagnose a pressure sore. ## When not to use - Not a medical device and not a diagnosis or treatment plan. - Each subscale is a caller-assigned published integer from Bergstrom 1987. magent does not examine the patient. - Only the 1987 predictive-validity cutoff of 16 is returned (at_risk true iff score ≤16). magent does not emit later mild, moderate, high, or severe bands. ## Formula ``` Braden = sensory_perception + moisture + activity + mobility + nutrition + friction_shear; Bergstrom 1987 caller-assigned points; 1-4 except friction_shear 1-3; range 6-23; at_risk iff score ≤ 16 ``` ## Citation [The Braden Scale for Predicting Pressure Sore Risk](https://doi.org/10.1097/00006199-198707000-00002) Bergstrom N, Braden BJ, Laguzza A, Holman V Nurs Res. 1987;36(4):205-210 DOI: [10.1097/00006199-198707000-00002](https://doi.org/10.1097/00006199-198707000-00002) ## Worked example ### All items 1 Given: `activity=1, friction_shear=1, mobility=1, moisture=1, nutrition=1, sensory_perception=1` 1. sensory_perception 1 + moisture 1 + activity 1 + mobility 1 + nutrition 1 + friction_shear 1 2. Score = 6 (max 23); at_risk true (minimum / highest risk) ### All independent Given: `activity=4, friction_shear=3, mobility=4, moisture=4, nutrition=4, sensory_perception=4` 1. sensory_perception 4 + moisture 4 + activity 4 + mobility 4 + nutrition 4 + friction_shear 3 2. Score = 23 (max 23); at_risk false ## Also searched as - Braden Scale - Braden score - Bergstrom Braden - pressure sore risk - Braden 1987 - Braden Scale for Predicting Pressure Sore Risk - pressure ulcer risk ## Parameters - `sensory_perception` (integer, required): Caller-assigned Bergstrom 1987 Braden sensory perception (integer 1-4): 1 completely limited; 2 very limited; 3 slightly limited; 4 no impairment. magent does not examine the patient. - `moisture` (integer, required): Caller-assigned Bergstrom 1987 Braden moisture (integer 1-4): 1 constantly moist; 2 very moist; 3 occasionally moist; 4 rarely moist. magent does not examine the patient. - `activity` (integer, required): Caller-assigned Bergstrom 1987 Braden activity (integer 1-4): 1 bedfast; 2 chairfast; 3 walks occasionally; 4 walks frequently. magent does not examine the patient. - `mobility` (integer, required): Caller-assigned Bergstrom 1987 Braden mobility (integer 1-4): 1 completely immobile; 2 very limited; 3 slightly limited; 4 no limitations. magent does not examine the patient. - `nutrition` (integer, required): Caller-assigned Bergstrom 1987 Braden nutrition (integer 1-4): 1 very poor; 2 probably inadequate; 3 adequate; 4 excellent. magent does not examine the patient. - `friction_shear` (integer, required): Caller-assigned Bergstrom 1987 Braden friction and shear (integer 1-3 only): 1 problem; 2 potential problem; 3 no apparent problem. magent does not examine the patient. ## 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/braden` 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": [ { "activity": "1", "friction_shear": "1", "mobility": "1", "moisture": "1", "nutrition": "1", "sensory_perception": "1" }, { "activity": "1", "friction_shear": "1", "mobility": "1", "moisture": "1", "nutrition": "1", "sensory_perception": "1" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/braden Example 200: ```json { "count": 2, "path": "/api/calc/braden", "items": [ { "components": [ { "value": 1, "factor": "sensory_perception", "points": 1, "present": true }, { "value": 1, "factor": "moisture", "points": 1, "present": true }, { "value": 1, "factor": "activity", "points": 1, "present": true }, { "value": 1, "factor": "mobility", "points": 1, "present": true }, { "value": 1, "factor": "nutrition", "points": 1, "present": true }, { "value": 1, "factor": "friction_shear", "points": 1, "present": true } ], "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": "Bergstrom N, Braden BJ, Laguzza A, Holman V", "doi": "10.1097/00006199-198707000-00002", "id": "bergstrom-1987", "pmid": "3299278", "source": "Nurs Res. 1987;36(4):205-210", "title": "The Braden Scale for Predicting Pressure Sore Risk" }, "formula": "braden", "formula_expression": "Braden = sensory_perception + moisture + activity + mobility + nutrition + friction_shear; Bergstrom 1987 caller-assigned points; 1-4 except friction_shear 1-3; range 6-23; at_risk iff score ≤ 16", "max_score": 23, "score": 6, "at_risk": true }, { "components": [ { "value": 1, "factor": "sensory_perception", "points": 1, "present": true }, { "value": 1, "factor": "moisture", "points": 1, "present": true }, { "value": 1, "factor": "activity", "points": 1, "present": true }, { "value": 1, "factor": "mobility", "points": 1, "present": true }, { "value": 1, "factor": "nutrition", "points": 1, "present": true }, { "value": 1, "factor": "friction_shear", "points": 1, "present": true } ], "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": "Bergstrom N, Braden BJ, Laguzza A, Holman V", "doi": "10.1097/00006199-198707000-00002", "id": "bergstrom-1987", "pmid": "3299278", "source": "Nurs Res. 1987;36(4):205-210", "title": "The Braden Scale for Predicting Pressure Sore Risk" }, "formula": "braden", "formula_expression": "Braden = sensory_perception + moisture + activity + mobility + nutrition + friction_shear; Bergstrom 1987 caller-assigned points; 1-4 except friction_shear 1-3; range 6-23; at_risk iff score ≤ 16", "max_score": 23, "score": 6, "at_risk": true } ] } ``` ## Response fields - `formula` (string): braden - `formula_expression` (string): Exact expression used - `score` (integer): Braden Scale points 6-23 - `max_score` (integer): Always 23 - `at_risk` (boolean): true iff Bergstrom 1987 score ≤16 (100% sensitivity cutoff in both predictive-validity studies). Not a diagnosis. - `components` (array): Per-subscale caller-assigned points - `citation` (object): Bergstrom et al. Nurs Res 1987 citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "value": 1, "factor": "sensory_perception", "points": 1, "present": true }, { "value": 1, "factor": "moisture", "points": 1, "present": true }, { "value": 1, "factor": "activity", "points": 1, "present": true }, { "value": 1, "factor": "mobility", "points": 1, "present": true }, { "value": 1, "factor": "nutrition", "points": 1, "present": true }, { "value": 1, "factor": "friction_shear", "points": 1, "present": true } ], "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": "Bergstrom N, Braden BJ, Laguzza A, Holman V", "doi": "10.1097/00006199-198707000-00002", "id": "bergstrom-1987", "pmid": "3299278", "source": "Nurs Res. 1987;36(4):205-210", "title": "The Braden Scale for Predicting Pressure Sore Risk" }, "formula": "braden", "formula_expression": "Braden = sensory_perception + moisture + activity + mobility + nutrition + friction_shear; Bergstrom 1987 caller-assigned points; 1-4 except friction_shear 1-3; range 6-23; at_risk iff score ≤ 16", "max_score": 23, "score": 6, "at_risk": true } ``` ## Errors - HTTP 400 `invalid_braden_item`: sensory_perception, moisture, activity, mobility, and nutrition must each be 1-4, and friction_shear must be 1-3 (Bergstrom 1987). 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 - [NRS-2002](https://magentlab.com/docs/nrs-2002) — Sum Kondrup 2003 NRS-2002 impaired nutritional status (0–3), disease severity (0–3), and 1 if age ≥70, and return whether the total is at nutritional risk (score ≥3). - [NUTRIC](https://magentlab.com/docs/nutric) — Sum Heyland 2011 original 6-variable NUTRIC (Nutrition Risk in the Critically Ill) Table 4 overall points, including IL-6, and return whether the total is high nutrition risk (score ≥6). - [Charlson CCI](https://magentlab.com/docs/charlson) — Sum the nineteen Charlson 1987 original comorbidity weights and return the published 1-year mortality group. ## 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.