Emergency · LIVE

Rochester criteria for febrile infants

Rochester criteria

Apply the Dagan 1985 Rochester criteria and return low_risk only when every published criterion holds for an infant younger than 3 months.

LIVE $0.005 USDC GET /api/calc/rochester

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

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

What it computes

Apply the Dagan 1985 Rochester criteria and return low_risk only when every published criterion holds for an infant younger than 3 months.

When to use

When an agent already has Dagan 1985 Rochester findings as assigned by the caller and needs the published all-criteria low-risk boolean. magent does not examine the infant. Not Boston, Philadelphia, or PECARN febrile infant 2021.

When not to use

• Not a medical device.
• magent does not examine the infant. The caller assigns published yes/no findings and laboratory values.
• This tool is the Dagan 1985 Rochester criteria only. Not Boston criteria, not Philadelphia criteria, and not PECARN febrile infant 2021.
• Not a diagnosis of serious bacterial infection and not a discharge, admission, LP, or antibiotic order.
• Eligible age is younger than 3 months (age_days 0-89). Age 90 is accepted as a parameter but is not low-risk.
• Returns the published low-risk boolean only. Does not report SBI percentages.

Formula

low_risk iff age_days < 90 and previously_healthy and well_appearing and no_focal_infection and 5000 <= wbc_ul <= 15000 and abc_ul < 1500 and ua_wbc_le_10 and (not diarrhea or stool_wbc_le_5) (Dagan 1985)

Citation

Title

Identification of infants unlikely to have serious bacterial infection although hospitalized for suspected sepsis

Authors

Dagan R, Powell KR, Hall CB, Menegus MA

Source

J Pediatr. 1985;107(6):855-860

DOI

10.1016/s0022-3476(85)80175-x

Worked example

Also searched as

• Rochester criteria
• Rochester febrile infant
• Dagan 1985
• Rochester suspected sepsis
• febrile infant low risk
• Rochester criteria infants
• Dagan Powell Hall Menegus
• infant serious bacterial infection rule

Try

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

/api/calc/rochester?age_days=45&previously_healthy=true&well_appearing=true&no_focal_infection=true&wbc_k_ul=8.0&abc_ul=200&ua_wbc_le_10=true&diarrhea=false

Full URL: https://api.magentlab.com/api/calc/rochester?age_days=45&previously_healthy=true&well_appearing=true&no_focal_infection=true&wbc_k_ul=8.0&abc_ul=200&ua_wbc_le_10=true&diarrhea=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/rochester?age_days=45&previously_healthy=true&well_appearing=true&no_focal_infection=true&wbc_k_ul=8.0&abc_ul=200&ua_wbc_le_10=true&diarrhea=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/rochester 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": [
    {
      "abc_ul": "200",
      "age_days": "45",
      "diarrhea": "false",
      "no_focal_infection": "true",
      "previously_healthy": "true",
      "ua_wbc_le_10": "true",
      "wbc_k_ul": "8.0",
      "well_appearing": "true"
    },
    {
      "abc_ul": "200",
      "age_days": "45",
      "diarrhea": "false",
      "no_focal_infection": "true",
      "previously_healthy": "true",
      "ua_wbc_le_10": "true",
      "wbc_k_ul": "8.0",
      "well_appearing": "true"
    }
  ]
}

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/rochester",
  "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": "Dagan R, Powell KR, Hall CB, Menegus MA",
        "doi": "10.1016/s0022-3476(85)80175-x",
        "id": "dagan-1985",
        "pmid": "4067741",
        "source": "J Pediatr. 1985;107(6):855-860",
        "title": "Identification of infants unlikely to have serious bacterial infection although hospitalized for suspected sepsis"
      },
      "formula": "rochester",
      "formula_expression": "low_risk iff age_days < 90 and previously_healthy and well_appearing and no_focal_infection and 5000 <= wbc_ul <= 15000 and abc_ul < 1500 and ua_wbc_le_10 and (not diarrhea or stool_wbc_le_5) (Dagan 1985)",
      "criteria": [
        {
          "value": 45,
          "factor": "age_lt_90",
          "met": true
        },
        {
          "factor": "previously_healthy",
          "met": true
        },
        {
          "factor": "well_appearing",
          "met": true
        },
        {
          "factor": "no_focal_infection",
          "met": true
        },
        {
          "value": 8.0e3,
          "factor": "wbc_5_to_15",
          "met": true
        },
        {
          "value": 200.0,
          "factor": "abc_lt_1500",
          "met": true
        },
        {
          "factor": "ua_wbc_le_10",
          "met": true
        },
        {
          "factor": "stool_ok",
          "met": true
        }
      ],
      "wbc_ul": 8.0e3,
      "low_risk": true,
      "abc_ul": 200.0,
      "age_days": 45
    },
    {
      "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": "Dagan R, Powell KR, Hall CB, Menegus MA",
        "doi": "10.1016/s0022-3476(85)80175-x",
        "id": "dagan-1985",
        "pmid": "4067741",
        "source": "J Pediatr. 1985;107(6):855-860",
        "title": "Identification of infants unlikely to have serious bacterial infection although hospitalized for suspected sepsis"
      },
      "formula": "rochester",
      "formula_expression": "low_risk iff age_days < 90 and previously_healthy and well_appearing and no_focal_infection and 5000 <= wbc_ul <= 15000 and abc_ul < 1500 and ua_wbc_le_10 and (not diarrhea or stool_wbc_le_5) (Dagan 1985)",
      "criteria": [
        {
          "value": 45,
          "factor": "age_lt_90",
          "met": true
        },
        {
          "factor": "previously_healthy",
          "met": true
        },
        {
          "factor": "well_appearing",
          "met": true
        },
        {
          "factor": "no_focal_infection",
          "met": true
        },
        {
          "value": 8.0e3,
          "factor": "wbc_5_to_15",
          "met": true
        },
        {
          "value": 200.0,
          "factor": "abc_lt_1500",
          "met": true
        },
        {
          "factor": "ua_wbc_le_10",
          "met": true
        },
        {
          "factor": "stool_ok",
          "met": true
        }
      ],
      "wbc_ul": 8.0e3,
      "low_risk": true,
      "abc_ul": 200.0,
      "age_days": 45
    }
  ]
}

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": "Dagan R, Powell KR, Hall CB, Menegus MA",
    "doi": "10.1016/s0022-3476(85)80175-x",
    "id": "dagan-1985",
    "pmid": "4067741",
    "source": "J Pediatr. 1985;107(6):855-860",
    "title": "Identification of infants unlikely to have serious bacterial infection although hospitalized for suspected sepsis"
  },
  "formula": "rochester",
  "formula_expression": "low_risk iff age_days < 90 and previously_healthy and well_appearing and no_focal_infection and 5000 <= wbc_ul <= 15000 and abc_ul < 1500 and ua_wbc_le_10 and (not diarrhea or stool_wbc_le_5) (Dagan 1985)",
  "criteria": [
    {
      "value": 45,
      "factor": "age_lt_90",
      "met": true
    },
    {
      "factor": "previously_healthy",
      "met": true
    },
    {
      "factor": "well_appearing",
      "met": true
    },
    {
      "factor": "no_focal_infection",
      "met": true
    },
    {
      "value": 8.0e3,
      "factor": "wbc_5_to_15",
      "met": true
    },
    {
      "value": 200.0,
      "factor": "abc_lt_1500",
      "met": true
    },
    {
      "factor": "ua_wbc_le_10",
      "met": true
    },
    {
      "factor": "stool_ok",
      "met": true
    }
  ],
  "wbc_ul": 8.0e3,
  "low_risk": true,
  "abc_ul": 200.0,
  "age_days": 45
}

Client errors (HTTP 400)

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

Related tools

• Bacterial Meningitis Score — Sum the Nigrovic 2002 Bacterial Meningitis Score weights for children with CSF pleocytosis and return very_low_risk (0) or not_low_risk (≥1).

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.