Emergency · LIVE

RHMP-30 (de Jong 2025)

RHMP-30

Compute the de Jong 2025 Rotterdam Hip Fracture Mortality Prediction-30 Days (RHMP-30) logistic 30-day mortality probability after hip fracture surgery from caller-assigned age, sex, albumin in g/L, dementia, Katz-ADL total, ASA 4, and nursing-home residence.

LIVE $0.005 USDC GET /api/calc/rhmp_30

Markdown: /docs/rhmp-30.md · Canonical: https://magentlab.com/docs/rhmp-30

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

What it computes

Compute the de Jong 2025 Rotterdam Hip Fracture Mortality Prediction-30 Days (RHMP-30) logistic 30-day mortality probability after hip fracture surgery from caller-assigned age, sex, albumin in g/L, dementia, Katz-ADL total, ASA 4, and nursing-home residence.

When to use

When an agent has de Jong 2025 RHMP-30 predictors and needs the published 30-day mortality probability from the unrounded logit, not an operative vs nonoperative order and not an unpublished website band.

When not to use

• Not a medical device. Not a diagnosis. Not an operative vs nonoperative order. magent does not assign ASA class or Katz-ADL and does not examine the patient.
• de Jong 2025 Figure 3 / Appendix 4 adaptive LASSO logit only. No published probability cutoff. magent does not invent low/moderate/high bands.
• Sex is the published female coefficient (female = 1, male = 0), not race.
• Albumin is g/L as in de Jong 2025 Table I (typical 30-45), not g/dL. Caller-supplied; magent does not assay albumin.
• dementia, asa_4, nursing_home, and Katz-ADL total are caller-assigned. magent does not diagnose dementia or score Katz items.
• estimated_mortality_percent is a population probability from the unrounded logit, not an individual outcome. de Jong 2025 excluded nonoperative patients.

Formula

logit = -2.69 - 0.0442*albumin_g_l + 0.0306*age_years - 1.012*female + 0.360*dementia - 0.0853*katz_adl + 0.856*asa_4 + 0.726*nursing_home; estimated_mortality_percent = 100 * exp(logit)/(1+exp(logit)) from the unrounded logit, 2 decimals; displayed logit 2 decimals; female is 1 if sex is female else 0; dementia, asa_4, and nursing_home are 1 if true else 0; albumin is g/L (not g/dL); Katz-ADL total 0-6 (6 = independent)

Citation

Title

Multidimensional Approach for Predicting 30-Day Mortality in Patients with a Hip Fracture: Development and External Validation of the Rotterdam Hip Fracture Mortality Prediction-30 Days (RHMP-30)

Authors

de Jong L, de Haan E, van Rijckevorsel VAJIM, Kuijper TM, Roukema GR

Source

J Bone Joint Surg Am. 2025;107(5):459-468

DOI

10.2106/JBJS.23.01397

Worked example

Also searched as

• RHMP 30
• Rotterdam hip fracture mortality
• de Jong 2025 hip fracture
• 30-day hip fracture mortality
• hip fracture LASSO logit
• Katz-ADL hip fracture
• albumin hip fracture mortality

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/rhmp_30?age=80&sex=female&albumin_g_l=38&dementia=false&katz_adl=6&asa_4=false&nursing_home=false

Full URL: https://api.magentlab.com/api/calc/rhmp_30?age=80&sex=female&albumin_g_l=38&dementia=false&katz_adl=6&asa_4=false&nursing_home=false

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/rhmp_30?age=80&sex=female&albumin_g_l=38&dementia=false&katz_adl=6&asa_4=false&nursing_home=false"

Parameters

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.

POST /api/calc/rhmp_30 Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 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 (fixture)

{
  "items": [
    {
      "age": "80",
      "albumin_g_l": "38",
      "asa_4": "false",
      "dementia": "false",
      "katz_adl": "6",
      "nursing_home": "false",
      "sex": "female"
    },
    {
      "age": "80",
      "albumin_g_l": "38",
      "asa_4": "false",
      "dementia": "false",
      "katz_adl": "6",
      "nursing_home": "false",
      "sex": "female"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/rhmp_30",
  "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": "de Jong L, de Haan E, van Rijckevorsel VAJIM, Kuijper TM, Roukema GR",
        "doi": "10.2106/JBJS.23.01397",
        "id": "de-jong-2025",
        "pmid": "39836737",
        "source": "J Bone Joint Surg Am. 2025;107(5):459-468",
        "title": "Multidimensional Approach for Predicting 30-Day Mortality in Patients with a Hip Fracture: Development and External Validation of the Rotterdam Hip Fracture Mortality Prediction-30 Days (RHMP-30)"
      },
      "formula": "rhmp_30",
      "formula_expression": "logit = -2.69 - 0.0442*albumin_g_l + 0.0306*age_years - 1.012*female + 0.360*dementia - 0.0853*katz_adl + 0.856*asa_4 + 0.726*nursing_home; estimated_mortality_percent = 100 * exp(logit)/(1+exp(logit)) from the unrounded logit, 2 decimals; displayed logit 2 decimals; female is 1 if sex is female else 0; dementia, asa_4, and nursing_home are 1 if true else 0; albumin is g/L (not g/dL); Katz-ADL total 0-6 (6 = independent)",
      "age_years": 80,
      "sex": "female",
      "logit": -3.45,
      "albumin_g_l": 38.0,
      "estimated_mortality_percent": 3.09,
      "asa_4": false,
      "dementia": false,
      "katz_adl": 6,
      "nursing_home": 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": "de Jong L, de Haan E, van Rijckevorsel VAJIM, Kuijper TM, Roukema GR",
        "doi": "10.2106/JBJS.23.01397",
        "id": "de-jong-2025",
        "pmid": "39836737",
        "source": "J Bone Joint Surg Am. 2025;107(5):459-468",
        "title": "Multidimensional Approach for Predicting 30-Day Mortality in Patients with a Hip Fracture: Development and External Validation of the Rotterdam Hip Fracture Mortality Prediction-30 Days (RHMP-30)"
      },
      "formula": "rhmp_30",
      "formula_expression": "logit = -2.69 - 0.0442*albumin_g_l + 0.0306*age_years - 1.012*female + 0.360*dementia - 0.0853*katz_adl + 0.856*asa_4 + 0.726*nursing_home; estimated_mortality_percent = 100 * exp(logit)/(1+exp(logit)) from the unrounded logit, 2 decimals; displayed logit 2 decimals; female is 1 if sex is female else 0; dementia, asa_4, and nursing_home are 1 if true else 0; albumin is g/L (not g/dL); Katz-ADL total 0-6 (6 = independent)",
      "age_years": 80,
      "sex": "female",
      "logit": -3.45,
      "albumin_g_l": 38.0,
      "estimated_mortality_percent": 3.09,
      "asa_4": false,
      "dementia": false,
      "katz_adl": 6,
      "nursing_home": false
    }
  ]
}

Response

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "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": "de Jong L, de Haan E, van Rijckevorsel VAJIM, Kuijper TM, Roukema GR",
    "doi": "10.2106/JBJS.23.01397",
    "id": "de-jong-2025",
    "pmid": "39836737",
    "source": "J Bone Joint Surg Am. 2025;107(5):459-468",
    "title": "Multidimensional Approach for Predicting 30-Day Mortality in Patients with a Hip Fracture: Development and External Validation of the Rotterdam Hip Fracture Mortality Prediction-30 Days (RHMP-30)"
  },
  "formula": "rhmp_30",
  "formula_expression": "logit = -2.69 - 0.0442*albumin_g_l + 0.0306*age_years - 1.012*female + 0.360*dementia - 0.0853*katz_adl + 0.856*asa_4 + 0.726*nursing_home; estimated_mortality_percent = 100 * exp(logit)/(1+exp(logit)) from the unrounded logit, 2 decimals; displayed logit 2 decimals; female is 1 if sex is female else 0; dementia, asa_4, and nursing_home are 1 if true else 0; albumin is g/L (not g/dL); Katz-ADL total 0-6 (6 = independent)",
  "age_years": 80,
  "sex": "female",
  "logit": -3.45,
  "albumin_g_l": 38.0,
  "estimated_mortality_percent": 3.09,
  "asa_4": false,
  "dementia": false,
  "katz_adl": 6,
  "nursing_home": false
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

Related tools

• NHFS — Sum the Maxwell 2008 Nottingham hip fracture score from seven preoperative variables and return the integer total (max 10).
• Gupta PRF — Compute the Gupta 2011 Chest logistic probability of postoperative respiratory failure (mechanical ventilation >48 h after surgery or unplanned intubation within 30 days) from ASA class, functional status, preoperative sepsis, emergency case, and surgery type.

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. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /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.