# Berg Balance Scale BBS Status: LIVE Price: $0.005 USDC `GET /api/calc/berg_balance` HTML: https://magentlab.com/docs/berg-balance Markdown: https://magentlab.com/docs/berg-balance.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Sum fourteen caller-assigned Berg 1992 Berg Balance Scale items (each integer 0-4) and return the published 0-56 total. Does not apply later 0-20/21-40/41-56 website bands. ## When to use When an agent already has Berg 1992 integers 0-4 for the fourteen Berg Balance Scale items and needs the published total. magent does not observe the patient, diagnose fall risk, score Timed Up and Go, or apply later 0-20 wheelchair / 21-40 walking-with-assistance / 41-56 independent website bands. ## When not to use - Not a medical device and not a diagnosis of fall risk or a treatment order. - Each of the fourteen items is a caller-assigned integer 0-4. magent does not observe the patient. - This is Berg 1992 Berg Balance Scale only (fourteen items; max 56). magent does not score Timed Up and Go. - Berg 1992 (PMID 1468055) published no 0-20 wheelchair / 21-40 walking-with-assistance / 41-56 independent website bands and no <45 fall-risk response field. This tool returns score and max_score only. It does not apply later website cutoffs. ## Formula ``` Berg Balance Scale = sitting_to_standing + standing_unsupported + sitting_unsupported + standing_to_sitting + transfers + standing_eyes_closed + standing_feet_together + reaching_forward + retrieving_object_from_floor + turning_to_look_behind + turning_360 + alternate_foot_on_stool + tandem_stance + standing_on_one_foot; each caller-assigned 0-4; Berg 1992 fourteen items; max 56; no 0-20 / 21-40 / 41-56 wheelchair/assist/independent website bands ``` ## Citation [Measuring balance in the elderly: validation of an instrument](https://pubmed.ncbi.nlm.nih.gov/1468055) Berg KO, Wood-Dauphinee SL, Williams JI, Maki B Can J Public Health. 1992;83 Suppl 2:S7-S11 DOI: none ## Worked example ### All items 0 Given: `alternate_foot_on_stool=0, reaching_forward=0, retrieving_object_from_floor=0, sitting_to_standing=0, sitting_unsupported=0, standing_eyes_closed=0, standing_feet_together=0, standing_on_one_foot=0, standing_to_sitting=0, standing_unsupported=0, tandem_stance=0, transfers=0, turning_360=0, turning_to_look_behind=0` 1. sitting_to_standing, standing_unsupported, sitting_unsupported, standing_to_sitting, transfers, standing_eyes_closed, standing_feet_together, reaching_forward, retrieving_object_from_floor, turning_to_look_behind, turning_360, alternate_foot_on_stool, tandem_stance, and standing_on_one_foot are 0 as assigned by the caller 2. Score = 0 (max 56). Berg 1992 published no 0-20/21-40/41-56 website band. ### All items 4 Given: `alternate_foot_on_stool=4, reaching_forward=4, retrieving_object_from_floor=4, sitting_to_standing=4, sitting_unsupported=4, standing_eyes_closed=4, standing_feet_together=4, standing_on_one_foot=4, standing_to_sitting=4, standing_unsupported=4, tandem_stance=4, transfers=4, turning_360=4, turning_to_look_behind=4` 1. each of the fourteen Berg 1992 Berg Balance Scale items is 4 as assigned by the caller 2. Score = 56 (max 56). No 0-20/21-40/41-56 website band. ## Also searched as - Berg Balance Scale - BBS - Berg 1992 BBS - Berg Balance Score - fourteen-item Berg - BBS 0-56 - functional balance Berg - elderly Berg balance ## Parameters - `sitting_to_standing` (integer, required): Caller-assigned Berg 1992 sitting to standing (integer 0-4): 4 able to stand without using hands and stabilize independently; 3 able to stand independently using hands; 2 able to stand using hands after several tries; 1 needs minimal aid to stand or stabilize; 0 needs moderate or maximal assist to stand. magent does not observe the patient. - `standing_unsupported` (integer, required): Caller-assigned Berg 1992 standing unsupported (integer 0-4): 4 able to stand safely for 2 minutes; 3 able to stand 2 minutes with supervision; 2 able to stand 30 seconds unsupported; 1 needs several tries to stand 30 seconds unsupported; 0 unable to stand 30 seconds unassisted. magent does not observe the patient. - `sitting_unsupported` (integer, required): Caller-assigned Berg 1992 sitting unsupported, feet supported (integer 0-4): 4 able to sit safely and securely for 2 minutes; 3 able to sit 2 minutes under supervision; 2 able to sit 30 seconds; 1 able to sit 10 seconds; 0 unable to sit without support 10 seconds. magent does not observe the patient. - `standing_to_sitting` (integer, required): Caller-assigned Berg 1992 standing to sitting (integer 0-4): 4 sits safely with minimal use of hands; 3 controls descent by using hands; 2 uses back of legs against chair to control descent; 1 sits independently but has uncontrolled descent; 0 needs assistance to sit. magent does not observe the patient. - `transfers` (integer, required): Caller-assigned Berg 1992 transfers (integer 0-4): 4 able to transfer safely with minor use of hands; 3 able to transfer safely definite need of hands; 2 able to transfer with verbal cuing and/or supervision; 1 needs one person to assist; 0 needs two people to assist or supervise to be safe. magent does not observe the patient. - `standing_eyes_closed` (integer, required): Caller-assigned Berg 1992 standing unsupported with eyes closed (integer 0-4): 4 able to stand 10 seconds safely; 3 able to stand 10 seconds with supervision; 2 able to stand 3 seconds; 1 unable to keep eyes closed 3 seconds but stays standing; 0 needs help to keep from falling. magent does not observe the patient. - `standing_feet_together` (integer, required): Caller-assigned Berg 1992 standing unsupported with feet together (integer 0-4): 4 able to place feet together independently and stand 1 minute safely; 3 able to place feet together independently and stand 1 minute with supervision; 2 able to place feet together independently but unable to hold 30 seconds; 1 needs help to attain position but able to stand 15 seconds; 0 needs help to attain position and unable to hold 15 seconds. magent does not observe the patient. - `reaching_forward` (integer, required): Caller-assigned Berg 1992 reaching forward with outstretched arm while standing (integer 0-4): 4 can reach forward confidently more than 25 cm (10 inches); 3 can reach forward more than 12 cm (5 inches) safely; 2 can reach forward more than 5 cm (2 inches) safely; 1 reaches forward but needs supervision; 0 loses balance while trying or requires external support. magent does not observe the patient. - `retrieving_object_from_floor` (integer, required): Caller-assigned Berg 1992 retrieving object from floor from a standing position (integer 0-4): 4 able to pick up slipper safely and easily; 3 able to pick up slipper but needs supervision; 2 unable to pick up but reaches 2-5 cm from slipper and keeps balance independently; 1 unable to pick up and needs supervision while trying; 0 unable to try or needs assist to keep from losing balance. magent does not observe the patient. - `turning_to_look_behind` (integer, required): Caller-assigned Berg 1992 turning to look behind over left and right shoulders while standing (integer 0-4): 4 looks behind from both sides with weight shift; 3 looks behind one side only other side shows less weight shift; 2 turns sideways only but maintains balance; 1 needs supervision when turning; 0 needs assist to keep from losing balance or falling. magent does not observe the patient. - `turning_360` (integer, required): Caller-assigned Berg 1992 turning 360 degrees (integer 0-4): 4 able to turn 360 degrees safely in 4 seconds or less; 3 able to turn 360 degrees safely one side only in 4 seconds or less; 2 able to turn 360 degrees safely but slowly; 1 needs close supervision or verbal cuing; 0 needs assistance while turning. magent does not observe the patient. - `alternate_foot_on_stool` (integer, required): Caller-assigned Berg 1992 placing alternate foot on step or stool while standing unsupported (integer 0-4): 4 able to stand independently and safely and complete 8 steps in 20 seconds; 3 able to stand independently and complete 8 steps in more than 20 seconds; 2 able to complete 4 steps without aid with supervision; 1 able to complete more than 2 steps needs minimal assist; 0 needs assistance to keep from falling or unable to try. magent does not observe the patient. - `tandem_stance` (integer, required): Caller-assigned Berg 1992 standing unsupported one foot in front (integer 0-4): 4 able to place foot tandem independently and hold 30 seconds; 3 able to place foot ahead of other independently and hold 30 seconds; 2 able to take small step independently and hold 30 seconds; 1 needs help to step but can hold 15 seconds; 0 loses balance while stepping or standing. magent does not observe the patient. - `standing_on_one_foot` (integer, required): Caller-assigned Berg 1992 standing on one foot (integer 0-4): 4 able to lift leg independently and hold more than 10 seconds; 3 able to lift leg independently and hold 5-10 seconds; 2 able to lift leg independently and hold at least 3 seconds; 1 tries to lift leg unable to hold 3 seconds but remains standing independently; 0 unable to try or needs assist to prevent fall. magent does not observe 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/berg_balance` 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": [ { "alternate_foot_on_stool": "0", "reaching_forward": "0", "retrieving_object_from_floor": "0", "sitting_to_standing": "0", "sitting_unsupported": "0", "standing_eyes_closed": "0", "standing_feet_together": "0", "standing_on_one_foot": "0", "standing_to_sitting": "0", "standing_unsupported": "0", "tandem_stance": "0", "transfers": "0", "turning_360": "0", "turning_to_look_behind": "0" }, { "alternate_foot_on_stool": "0", "reaching_forward": "0", "retrieving_object_from_floor": "0", "sitting_to_standing": "0", "sitting_unsupported": "0", "standing_eyes_closed": "0", "standing_feet_together": "0", "standing_on_one_foot": "0", "standing_to_sitting": "0", "standing_unsupported": "0", "tandem_stance": "0", "transfers": "0", "turning_360": "0", "turning_to_look_behind": "0" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/berg-balance Example 200: ```json { "count": 2, "path": "/api/calc/berg_balance", "items": [ { "components": [ { "value": 0, "factor": "sitting_to_standing", "points": 0, "present": true }, { "value": 0, "factor": "standing_unsupported", "points": 0, "present": true }, { "value": 0, "factor": "sitting_unsupported", "points": 0, "present": true }, { "value": 0, "factor": "standing_to_sitting", "points": 0, "present": true }, { "value": 0, "factor": "transfers", "points": 0, "present": true }, { "value": 0, "factor": "standing_eyes_closed", "points": 0, "present": true }, { "value": 0, "factor": "standing_feet_together", "points": 0, "present": true }, { "value": 0, "factor": "reaching_forward", "points": 0, "present": true }, { "value": 0, "factor": "retrieving_object_from_floor", "points": 0, "present": true }, { "value": 0, "factor": "turning_to_look_behind", "points": 0, "present": true }, { "value": 0, "factor": "turning_360", "points": 0, "present": true }, { "value": 0, "factor": "alternate_foot_on_stool", "points": 0, "present": true }, { "value": 0, "factor": "tandem_stance", "points": 0, "present": true }, { "value": 0, "factor": "standing_on_one_foot", "points": 0, "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": "Berg KO, Wood-Dauphinee SL, Williams JI, Maki B", "id": "berg-1992", "pmid": "1468055", "source": "Can J Public Health. 1992;83 Suppl 2:S7-S11", "title": "Measuring balance in the elderly: validation of an instrument" }, "formula": "berg_balance", "formula_expression": "Berg Balance Scale = sitting_to_standing + standing_unsupported + sitting_unsupported + standing_to_sitting + transfers + standing_eyes_closed + standing_feet_together + reaching_forward + retrieving_object_from_floor + turning_to_look_behind + turning_360 + alternate_foot_on_stool + tandem_stance + standing_on_one_foot; each caller-assigned 0-4; Berg 1992 fourteen items; max 56; no 0-20 / 21-40 / 41-56 wheelchair/assist/independent website bands", "max_score": 56, "score": 0 }, { "components": [ { "value": 0, "factor": "sitting_to_standing", "points": 0, "present": true }, { "value": 0, "factor": "standing_unsupported", "points": 0, "present": true }, { "value": 0, "factor": "sitting_unsupported", "points": 0, "present": true }, { "value": 0, "factor": "standing_to_sitting", "points": 0, "present": true }, { "value": 0, "factor": "transfers", "points": 0, "present": true }, { "value": 0, "factor": "standing_eyes_closed", "points": 0, "present": true }, { "value": 0, "factor": "standing_feet_together", "points": 0, "present": true }, { "value": 0, "factor": "reaching_forward", "points": 0, "present": true }, { "value": 0, "factor": "retrieving_object_from_floor", "points": 0, "present": true }, { "value": 0, "factor": "turning_to_look_behind", "points": 0, "present": true }, { "value": 0, "factor": "turning_360", "points": 0, "present": true }, { "value": 0, "factor": "alternate_foot_on_stool", "points": 0, "present": true }, { "value": 0, "factor": "tandem_stance", "points": 0, "present": true }, { "value": 0, "factor": "standing_on_one_foot", "points": 0, "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": "Berg KO, Wood-Dauphinee SL, Williams JI, Maki B", "id": "berg-1992", "pmid": "1468055", "source": "Can J Public Health. 1992;83 Suppl 2:S7-S11", "title": "Measuring balance in the elderly: validation of an instrument" }, "formula": "berg_balance", "formula_expression": "Berg Balance Scale = sitting_to_standing + standing_unsupported + sitting_unsupported + standing_to_sitting + transfers + standing_eyes_closed + standing_feet_together + reaching_forward + retrieving_object_from_floor + turning_to_look_behind + turning_360 + alternate_foot_on_stool + tandem_stance + standing_on_one_foot; each caller-assigned 0-4; Berg 1992 fourteen items; max 56; no 0-20 / 21-40 / 41-56 wheelchair/assist/independent website bands", "max_score": 56, "score": 0 } ] } ``` ## Response fields - `formula` (string): berg_balance - `formula_expression` (string): Exact expression used - `score` (integer): Berg 1992 sum of fourteen caller-assigned 0-4 items (total 0-56) - `max_score` (integer): Always 56 - `components` (array): Per-item caller-assigned points - `citation` (object): Berg Can J Public Health 1992 citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "value": 0, "factor": "sitting_to_standing", "points": 0, "present": true }, { "value": 0, "factor": "standing_unsupported", "points": 0, "present": true }, { "value": 0, "factor": "sitting_unsupported", "points": 0, "present": true }, { "value": 0, "factor": "standing_to_sitting", "points": 0, "present": true }, { "value": 0, "factor": "transfers", "points": 0, "present": true }, { "value": 0, "factor": "standing_eyes_closed", "points": 0, "present": true }, { "value": 0, "factor": "standing_feet_together", "points": 0, "present": true }, { "value": 0, "factor": "reaching_forward", "points": 0, "present": true }, { "value": 0, "factor": "retrieving_object_from_floor", "points": 0, "present": true }, { "value": 0, "factor": "turning_to_look_behind", "points": 0, "present": true }, { "value": 0, "factor": "turning_360", "points": 0, "present": true }, { "value": 0, "factor": "alternate_foot_on_stool", "points": 0, "present": true }, { "value": 0, "factor": "tandem_stance", "points": 0, "present": true }, { "value": 0, "factor": "standing_on_one_foot", "points": 0, "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": "Berg KO, Wood-Dauphinee SL, Williams JI, Maki B", "id": "berg-1992", "pmid": "1468055", "source": "Can J Public Health. 1992;83 Suppl 2:S7-S11", "title": "Measuring balance in the elderly: validation of an instrument" }, "formula": "berg_balance", "formula_expression": "Berg Balance Scale = sitting_to_standing + standing_unsupported + sitting_unsupported + standing_to_sitting + transfers + standing_eyes_closed + standing_feet_together + reaching_forward + retrieving_object_from_floor + turning_to_look_behind + turning_360 + alternate_foot_on_stool + tandem_stance + standing_on_one_foot; each caller-assigned 0-4; Berg 1992 fourteen items; max 56; no 0-20 / 21-40 / 41-56 wheelchair/assist/independent website bands", "max_score": 56, "score": 0 } ``` ## Errors - HTTP 400 `invalid_berg_balance`: Berg Balance Scale needs the fourteen Berg 1992 items each as an integer 0-4. Returned before settlement; you are not charged. - HTTP 400 `invalid_berg_balance_item`: each Berg Balance Scale item must be an integer from 0 to 4 (Berg 1992). 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 - [Barthel Index](https://magentlab.com/docs/barthel) — Sum ten caller-assigned Mahoney 1965 Barthel Index item points and return the published 0-100 total. - [NDI](https://magentlab.com/docs/ndi) — Sum ten caller-assigned Vernon 1991 Neck Disability Index sections (each integer 0-5) and return the published 0-50 total with that paper's raw-score disability bands. ## 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.