Infection / VTE · LIVE

Pneumonia risk score (Lipsett)

PRS

Compute the Lipsett 2022 Pneumonia Risk Score logistic probability of radiographic pneumonia in children 3 months to 18 years, and the supplement integer score 1–6, from age, triage oxygen saturation, fever, rales, and wheeze.

LIVE $0.005 USDC GET /api/calc/prs

Markdown: /docs/prs.md · Canonical: https://magentlab.com/docs/prs

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

What it computes

Compute the Lipsett 2022 Pneumonia Risk Score logistic probability of radiographic pneumonia in children 3 months to 18 years, and the supplement integer score 1–6, from age, triage oxygen saturation, fever, rales, and wheeze.

When to use

When an agent already has caller-assigned pediatric age, triage saturation, fever, rales, and wheeze for a child in whom CXR was considered for suspected pneumonia and needs the published Lipsett 2022 probability and score, not a pneumonia diagnosis and not a CXR or antibiotic order.

When not to use

• Not a medical device. magent does not diagnose pneumonia and does not order a chest radiograph or antibiotics.
• Not CURB-65. CURB-65 is an adult severity score. This is the Lipsett 2022 pediatric radiographic-pneumonia model only.
• Derived and validated in children whose clinicians already obtained a CXR for suspected pneumonia. Broad use in all respiratory illness may overestimate probability.
• Age, saturation, fever, rales, and wheeze are caller-assigned. magent does not auscultate or take a saturation.
• Score 1–6 is the published SDC mapping from the logistic probability. magent does not invent additional named risk bands.

Formula

logit = 18.05624 + 0.098308*age_years + 1.144985*fever + (-0.21636)*spo2_percent + 0.407494*rales + (-0.907087)*wheeze (Lipsett 2022 SDC INF/E552; flags 1 if true else 0); probability_percent = 100 * exp(logit) / (1 + exp(logit)) from the unrounded logit, 2 decimals; score 1 if p < 0.05, 2 if p < 0.11, 3 if p < 0.21, 4 if p < 0.51, 5 if p < 0.75, else 6 (SDC wrote >=0.76 after <0.75; magent closes that hole at 0.75)

Citation

Title

Development of the Novel Pneumonia Risk Score to Predict Radiographic Pneumonia in Children

Authors

Lipsett SC, Hirsch AW, Monuteaux MC, Bachur RG, Neuman MI

Source

Pediatr Infect Dis J. 2022;41(1):24-30

DOI

10.1097/INF.0000000000003361

Worked example

Also searched as

• pneumonia risk score
• Lipsett PRS
• novel pneumonia risk score
• pediatric radiographic pneumonia
• pediatric CXR pneumonia score
• Lipsett 2022 pneumonia

Try

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

/api/calc/prs?age_years=2&spo2_percent=99&fever=false&rales=false&wheeze=false

Full URL: https://api.magentlab.com/api/calc/prs?age_years=2&spo2_percent=99&fever=false&rales=false&wheeze=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/prs?age_years=2&spo2_percent=99&fever=false&rales=false&wheeze=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/prs 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_years": "2",
      "fever": "false",
      "rales": "false",
      "spo2_percent": "99",
      "wheeze": "false"
    },
    {
      "age_years": "2",
      "fever": "false",
      "rales": "false",
      "spo2_percent": "99",
      "wheeze": "false"
    }
  ]
}

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/prs",
  "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": "Lipsett SC, Hirsch AW, Monuteaux MC, Bachur RG, Neuman MI",
        "doi": "10.1097/INF.0000000000003361",
        "id": "lipsett-2022",
        "pmid": "34694254",
        "source": "Pediatr Infect Dis J. 2022;41(1):24-30",
        "title": "Development of the Novel Pneumonia Risk Score to Predict Radiographic Pneumonia in Children"
      },
      "formula": "prs",
      "formula_expression": "logit = 18.05624 + 0.098308*age_years + 1.144985*fever + (-0.21636)*spo2_percent + 0.407494*rales + (-0.907087)*wheeze (Lipsett 2022 SDC INF/E552; flags 1 if true else 0); probability_percent = 100 * exp(logit) / (1 + exp(logit)) from the unrounded logit, 2 decimals; score 1 if p < 0.05, 2 if p < 0.11, 3 if p < 0.21, 4 if p < 0.51, 5 if p < 0.75, else 6 (SDC wrote >=0.76 after <0.75; magent closes that hole at 0.75)",
      "age_years": 2.0,
      "max_score": 6,
      "score": 1,
      "logit": -3.1668,
      "spo2_percent": 99.0,
      "wheeze": false,
      "fever": false,
      "probability_percent": 4.04,
      "rales": 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": "Lipsett SC, Hirsch AW, Monuteaux MC, Bachur RG, Neuman MI",
        "doi": "10.1097/INF.0000000000003361",
        "id": "lipsett-2022",
        "pmid": "34694254",
        "source": "Pediatr Infect Dis J. 2022;41(1):24-30",
        "title": "Development of the Novel Pneumonia Risk Score to Predict Radiographic Pneumonia in Children"
      },
      "formula": "prs",
      "formula_expression": "logit = 18.05624 + 0.098308*age_years + 1.144985*fever + (-0.21636)*spo2_percent + 0.407494*rales + (-0.907087)*wheeze (Lipsett 2022 SDC INF/E552; flags 1 if true else 0); probability_percent = 100 * exp(logit) / (1 + exp(logit)) from the unrounded logit, 2 decimals; score 1 if p < 0.05, 2 if p < 0.11, 3 if p < 0.21, 4 if p < 0.51, 5 if p < 0.75, else 6 (SDC wrote >=0.76 after <0.75; magent closes that hole at 0.75)",
      "age_years": 2.0,
      "max_score": 6,
      "score": 1,
      "logit": -3.1668,
      "spo2_percent": 99.0,
      "wheeze": false,
      "fever": false,
      "probability_percent": 4.04,
      "rales": 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": "Lipsett SC, Hirsch AW, Monuteaux MC, Bachur RG, Neuman MI",
    "doi": "10.1097/INF.0000000000003361",
    "id": "lipsett-2022",
    "pmid": "34694254",
    "source": "Pediatr Infect Dis J. 2022;41(1):24-30",
    "title": "Development of the Novel Pneumonia Risk Score to Predict Radiographic Pneumonia in Children"
  },
  "formula": "prs",
  "formula_expression": "logit = 18.05624 + 0.098308*age_years + 1.144985*fever + (-0.21636)*spo2_percent + 0.407494*rales + (-0.907087)*wheeze (Lipsett 2022 SDC INF/E552; flags 1 if true else 0); probability_percent = 100 * exp(logit) / (1 + exp(logit)) from the unrounded logit, 2 decimals; score 1 if p < 0.05, 2 if p < 0.11, 3 if p < 0.21, 4 if p < 0.51, 5 if p < 0.75, else 6 (SDC wrote >=0.76 after <0.75; magent closes that hole at 0.75)",
  "age_years": 2.0,
  "max_score": 6,
  "score": 1,
  "logit": -3.1668,
  "spo2_percent": 99.0,
  "wheeze": false,
  "fever": false,
  "probability_percent": 4.04,
  "rales": false
}

Client errors (HTTP 400)

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

Related tools

• Pediatric SIRS — Apply Goldstein 2005 pediatric SIRS age-group heart-rate, respiratory-rate, leukocyte, and core-temperature criteria, then the paper's sepsis, severe-sepsis, and septic-shock definitions from caller-assigned infection and organ-dysfunction flags.
• Centor and McIsaac scores — Compute the Centor score or the McIsaac age-modified score from four caller-assigned pharyngitis findings. The 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. 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.