# Revised Trauma Score (Champion 1989)

RTS

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/rts`
HTML: https://magentlab.com/docs/rts
Markdown: https://magentlab.com/docs/rts.md

Not a medical device. Not a diagnosis, dose, or listing recommendation.

## What it computes

Compute Champion 1989 coded GCS, SBP, and respiratory-rate values, the triage T-RTS sum, and the weighted RTS used for outcome evaluation.

## When to use

When an agent needs the published Revised Trauma Score (T-RTS and weighted RTS) and must not invent ISS, NISS, or the 1981 Trauma Score with capillary refill.

## When not to use

- Not a triage order or a diagnosis. magent does not examine the patient.
- GCS is a caller-supplied total 3-15 on the 1976 motor-6 scale used by Champion 1989; magent does not score eye/verbal/motor here.
- This is Champion 1989 only. It does not implement the 1981 Trauma Score (capillary refill and respiratory expansion).

## Formula

```
T-RTS = coded_gcs + coded_sbp + coded_rr (each 0-4); RTS = 0.9368*coded_gcs + 0.7326*coded_sbp + 0.2908*coded_rr
```

## Citation

[A revision of the Trauma Score](https://doi.org/10.1097/00005373-198905000-00017)
Champion HR, Sacco WJ, Copes WS, Gann DS, Gennarelli TA, Flanagan ME
J Trauma. 1989;29(5):623-629
DOI: [10.1097/00005373-198905000-00017](https://doi.org/10.1097/00005373-198905000-00017)

## Worked example

### GCS 15, SBP 120, RR 16

Given: `gcs=15, respiratory_rate=16, systolic_mm_hg=120`

1. GCS 15 → coded 4; SBP 120 → coded 4; RR 16 → coded 4
2. T-RTS = 4+4+4 = 12
3. RTS = 0.9368×4 + 0.7326×4 + 0.2908×4 = 7.8408


### GCS 3, SBP 0, RR 0

Given: `gcs=3, respiratory_rate=0, systolic_mm_hg=0`

1. each coded 0
2. T-RTS = 0; RTS = 0.0


## Also searched as

- revised trauma score
- T-RTS
- Champion RTS
- trauma score 1989
- weighted RTS
- physiologic trauma score

## Parameters

- `gcs` (integer, required): Glasgow Coma Scale total 3-15 (1976 motor-6 scale as used by Champion 1989). Caller-assigned; magent does not score eye/verbal/motor.
- `systolic_mm_hg` (integer, required): Systolic blood pressure in mm Hg (0-300). 0 is a published coded band.
- `respiratory_rate` (integer, required): Respiratory rate in breaths per minute (0-80). 0 is a published coded band.

## 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/rts`
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": [
    {
      "gcs": "15",
      "respiratory_rate": "16",
      "systolic_mm_hg": "120"
    },
    {
      "gcs": "15",
      "respiratory_rate": "16",
      "systolic_mm_hg": "120"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/rts

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/rts",
  "items": [
    {
      "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": "Champion HR, Sacco WJ, Copes WS, Gann DS, Gennarelli TA, Flanagan ME",
        "doi": "10.1097/00005373-198905000-00017",
        "id": "champion-1989",
        "source": "J Trauma. 1989;29(5):623-629",
        "title": "A revision of the Trauma Score"
      },
      "formula": "rts",
      "formula_expression": "T-RTS = coded_gcs + coded_sbp + coded_rr (each 0-4); RTS = 0.9368*coded_gcs + 0.7326*coded_sbp + 0.2908*coded_rr",
      "systolic_mm_hg": 120,
      "gcs": 15,
      "respiratory_rate": 16,
      "coded_gcs": 4,
      "coded_rr": 4,
      "coded_sbp": 4,
      "rts": 7.8408,
      "t_rts": 12
    },
    {
      "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": "Champion HR, Sacco WJ, Copes WS, Gann DS, Gennarelli TA, Flanagan ME",
        "doi": "10.1097/00005373-198905000-00017",
        "id": "champion-1989",
        "source": "J Trauma. 1989;29(5):623-629",
        "title": "A revision of the Trauma Score"
      },
      "formula": "rts",
      "formula_expression": "T-RTS = coded_gcs + coded_sbp + coded_rr (each 0-4); RTS = 0.9368*coded_gcs + 0.7326*coded_sbp + 0.2908*coded_rr",
      "systolic_mm_hg": 120,
      "gcs": 15,
      "respiratory_rate": 16,
      "coded_gcs": 4,
      "coded_rr": 4,
      "coded_sbp": 4,
      "rts": 7.8408,
      "t_rts": 12
    }
  ]
}
```

## Response fields

- `formula` (string): rts
- `formula_expression` (string): Champion 1989 T-RTS and RTS
- `gcs` (integer): Caller GCS total
- `systolic_mm_hg` (integer): Caller SBP
- `respiratory_rate` (integer): Caller respiratory rate
- `coded_gcs` (integer): Coded GCS 0-4
- `coded_sbp` (integer): Coded SBP 0-4
- `coded_rr` (integer): Coded RR 0-4
- `t_rts` (integer): Triage RTS, sum of coded values, 0-12
- `rts` (number): Weighted RTS (4 decimal places)
- `citation` (object): Champion 1989
- `disclaimer` (string): Not a medical device

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "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": "Champion HR, Sacco WJ, Copes WS, Gann DS, Gennarelli TA, Flanagan ME",
    "doi": "10.1097/00005373-198905000-00017",
    "id": "champion-1989",
    "source": "J Trauma. 1989;29(5):623-629",
    "title": "A revision of the Trauma Score"
  },
  "formula": "rts",
  "formula_expression": "T-RTS = coded_gcs + coded_sbp + coded_rr (each 0-4); RTS = 0.9368*coded_gcs + 0.7326*coded_sbp + 0.2908*coded_rr",
  "systolic_mm_hg": 120,
  "gcs": 15,
  "respiratory_rate": 16,
  "coded_gcs": 4,
  "coded_rr": 4,
  "coded_sbp": 4,
  "rts": 7.8408,
  "t_rts": 12
}
```

## Errors

- HTTP 400 `invalid_gcs_total`: gcs must be an integer from 3 to 15. Returned before settlement; you are not charged.
- HTTP 400 `invalid_rts_systolic`: systolic_mm_hg must be an integer from 0 to 300. Returned before settlement; you are not charged.
- HTTP 400 `invalid_rts_respiratory_rate`: respiratory_rate must be an integer from 0 to 80. 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

- [ISS](https://magentlab.com/docs/iss) — Compute the Baker 1974 Injury Severity Score as the sum of squares of the three highest caller-assigned AIS body-region grades, or 75 if any region is AIS 6.
- [Glasgow Coma Scale](https://magentlab.com/docs/gcs) — Compute the Glasgow Coma Scale as the sum of caller-assigned eye, verbal, and motor integers. The 1974 or 1976 edition is required.

## 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.