ALT-70 cellulitis score

ALT-70

Sum the Raff 2017 ALT-70 items (unilateral involvement, leukocytosis, tachycardia, age ≥70) and return the published 0-2 / 3-4 / >=5 band.

LIVE $0.005 USDC GET /api/calc/alt_70

Markdown: /docs/alt-70.md · Canonical: https://magentlab.com/docs/alt-70

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

What it computes

Sum the Raff 2017 ALT-70 items (unilateral involvement, leukocytosis, tachycardia, age ≥70) and return the published 0-2 / 3-4 / >=5 band.

When to use

When an agent needs the published Raff 2017 ALT-70 total and must not invent a cellulitis diagnosis or an antibiotic order.

When not to use

Not a medical device.
Not a cellulitis diagnosis and not an antibiotic order.
Raff 2017 lower-extremity emergency-department derivation. magent does not examine the limb; unilateral is assigned by the caller.
Bands are Raff 2017 point regions 0-2, 3-4, and >=5. Percents are not returned.

Formula

ALT-70 = (unilateral → 3) + (WBC >= 10000/µL → 1) + (heart_rate_bpm >= 90 → 1) + (age >= 70 → 2); max 7; bands 0-2 / 3-4 / >=5

Citation

Title: A predictive model for diagnosis of lower extremity cellulitis: A cross-sectional study.
Authors: Raff AB, Weng QY, Cohen JM, et al.
Source: J Am Acad Dermatol. 2017;76(4):618-625.e2
DOI: 10.1016/j.jaad.2016.12.044

Worked example

All items absent

Given: age=40heart_rate_bpm=80unilateral=falsewbc_k_ul=8

Unilateral false → 0; WBC 8 k/µL <10 → 0; HR 80 <90 → 0; age 40 <70 → 0
Score = 0 (max 7); band 0-2

All four items present

Given: age=70heart_rate_bpm=90unilateral=truewbc_k_ul=10

Unilateral true → 3; WBC ≥10,000/µL → 1; HR ≥90 → 1; age ≥70 → 2
Score = 7 (max 7); band >=5

Also searched as

ALT-70
ALT 70 score
Raff ALT-70
cellulitis ALT-70
pseudocellulitis score
asymmetry leukocytosis tachycardia 70
lower extremity cellulitis score

Try

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

/api/calc/alt_70?age=40&unilateral=false&wbc_k_ul=8&heart_rate_bpm=80

Full URL: https://api.magentlab.com/api/calc/alt_70?age=40&unilateral=false&wbc_k_ul=8&heart_rate_bpm=80

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/alt_70?age=40&unilateral=false&wbc_k_ul=8&heart_rate_bpm=80"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years (18-120). Raff 2017: scores 2 when ≥70. Age 69 does not score.
`unilateral`	boolean	required	Unilateral (asymmetric) lower-extremity involvement (Raff 2017). true or false as assigned by the caller. 3 points if true. magent does not examine the limb.
`wbc_k_ul`	number	optional	WBC in 10^3/µL (same as k/µL or 10^9/L). Provide wbc_k_ul or wbc_ul. Range 0.01-500. ≥10 (10,000/µL) scores 1. 9.9 does not score.
`wbc_ul`	number	optional	WBC in cells/µL (same as cells/mm^3). Provide wbc_k_ul or wbc_ul. Range 10-500000. ≥10,000/µL scores 1.
`heart_rate_bpm`	integer	required	Heart rate in beats per minute (integer 30-220). Raff 2017: scores 1 when ≥90. Heart rate 89 does not score.

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/alt_70 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": "40",
      "heart_rate_bpm": "80",
      "unilateral": "false",
      "wbc_k_ul": "8"
    },
    {
      "age": "40",
      "heart_rate_bpm": "80",
      "unilateral": "false",
      "wbc_k_ul": "8"
    }
  ]
}

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/alt_70",
  "items": [
    {
      "band": "0-2",
      "components": [
        {
          "factor": "unilateral",
          "points": 0,
          "present": false
        },
        {
          "value": 8.0e3,
          "factor": "leukocytosis",
          "points": 0,
          "present": false
        },
        {
          "value": 80,
          "factor": "tachycardia",
          "points": 0,
          "present": false
        },
        {
          "value": 40,
          "factor": "age_ge_70",
          "points": 0,
          "present": 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.",
      "age_years": 40,
      "citation": {
        "authors": "Raff AB, Weng QY, Cohen JM, et al.",
        "doi": "10.1016/j.jaad.2016.12.044",
        "id": "raff-2017",
        "pmid": "28215446",
        "source": "J Am Acad Dermatol. 2017;76(4):618-625.e2",
        "title": "A predictive model for diagnosis of lower extremity cellulitis: A cross-sectional study."
      },
      "formula": "alt_70",
      "formula_expression": "ALT-70 = (unilateral → 3) + (WBC >= 10000/µL → 1) + (heart_rate_bpm >= 90 → 1) + (age >= 70 → 2); max 7; bands 0-2 / 3-4 / >=5",
      "max_score": 7,
      "score": 0,
      "wbc_per_ul": 8.0e3,
      "heart_rate_bpm": 80,
      "unilateral": false
    },
    {
      "band": "0-2",
      "components": [
        {
          "factor": "unilateral",
          "points": 0,
          "present": false
        },
        {
          "value": 8.0e3,
          "factor": "leukocytosis",
          "points": 0,
          "present": false
        },
        {
          "value": 80,
          "factor": "tachycardia",
          "points": 0,
          "present": false
        },
        {
          "value": 40,
          "factor": "age_ge_70",
          "points": 0,
          "present": 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.",
      "age_years": 40,
      "citation": {
        "authors": "Raff AB, Weng QY, Cohen JM, et al.",
        "doi": "10.1016/j.jaad.2016.12.044",
        "id": "raff-2017",
        "pmid": "28215446",
        "source": "J Am Acad Dermatol. 2017;76(4):618-625.e2",
        "title": "A predictive model for diagnosis of lower extremity cellulitis: A cross-sectional study."
      },
      "formula": "alt_70",
      "formula_expression": "ALT-70 = (unilateral → 3) + (WBC >= 10000/µL → 1) + (heart_rate_bpm >= 90 → 1) + (age >= 70 → 2); max 7; bands 0-2 / 3-4 / >=5",
      "max_score": 7,
      "score": 0,
      "wbc_per_ul": 8.0e3,
      "heart_rate_bpm": 80,
      "unilateral": false
    }
  ]
}

Response

Field	Type	Description
`formula`	string	alt_70
`formula_expression`	string	Exact expression used
`score`	integer	ALT-70 points 0-7
`max_score`	integer	7
`band`	string	Raff 2017 point region: 0-2 (pseudocellulitis-leaning), 3-4 (indeterminate), or >=5 (cellulitis-leaning). A band, not a diagnosis. Percents are not returned.
`age_years`	integer	Age used for the ≥70 criterion
`unilateral`	boolean	Unilateral-involvement flag used
`wbc_per_ul`	number	WBC in cells/µL used
`heart_rate_bpm`	integer	Heart rate used, bpm
`components`	array	Per-item Raff 2017 points
`citation`	object	Raff et al. J Am Acad Dermatol 2017 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "band": "0-2",
  "components": [
    {
      "factor": "unilateral",
      "points": 0,
      "present": false
    },
    {
      "value": 8.0e3,
      "factor": "leukocytosis",
      "points": 0,
      "present": false
    },
    {
      "value": 80,
      "factor": "tachycardia",
      "points": 0,
      "present": false
    },
    {
      "value": 40,
      "factor": "age_ge_70",
      "points": 0,
      "present": 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.",
  "age_years": 40,
  "citation": {
    "authors": "Raff AB, Weng QY, Cohen JM, et al.",
    "doi": "10.1016/j.jaad.2016.12.044",
    "id": "raff-2017",
    "pmid": "28215446",
    "source": "J Am Acad Dermatol. 2017;76(4):618-625.e2",
    "title": "A predictive model for diagnosis of lower extremity cellulitis: A cross-sectional study."
  },
  "formula": "alt_70",
  "formula_expression": "ALT-70 = (unilateral → 3) + (WBC >= 10000/µL → 1) + (heart_rate_bpm >= 90 → 1) + (age >= 70 → 2); max 7; bands 0-2 / 3-4 / >=5",
  "max_score": 7,
  "score": 0,
  "wbc_per_ul": 8.0e3,
  "heart_rate_bpm": 80,
  "unilateral": false
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_age`	age must be an integer from 18 to 120 Returned before settlement; you are not charged.
400	`invalid_flag`	boolean clinical flags must be true or false Returned before settlement; you are not charged.
400	`invalid_wbc`	wbc_k_ul (0.01-500) or wbc_ul (10-500000) is required Returned before settlement; you are not charged.
400	`invalid_heart_rate`	heart_rate_bpm must be an integer from 30 to 220 Returned before settlement; you are not charged.
400	`invalid_items`	POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400	`invalid_item_count`	items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400	`invalid_item`	each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

LRINEC — Sum the Wong 2004 LRINEC laboratory table and return whether the total is at or above the published cutoff of 6.
SIRS — Compute the Bone 1992 ACCP/SCCM SIRS criteria from temperature, heart rate, respiratory rate, and WBC, with optional PaCO2 and band percent.

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.
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.