Appendicitis inflammatory response score

AIR score

Compute the Andersson 2008 appendicitis inflammatory response (AIR) score from caller-assigned findings, temperature, WBC, neutrophil percent, and CRP in mg/L.

LIVE $0.005 USDC GET /api/calc/air

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

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

What it computes

Compute the Andersson 2008 appendicitis inflammatory response (AIR) score from caller-assigned findings, temperature, WBC, neutrophil percent, and CRP in mg/L.

When to use

When an agent needs the published Andersson 2008 AIR total and must not invent abdominal findings or treat the total as an operating-room protocol.

When not to use

Not a medical device. Not a diagnosis or operating-room protocol.
Findings, rebound or guarding grade, and laboratory values are caller-assigned. magent does not examine the abdomen.
CRP is scored in mg/L, not mg/dL (Andersson 2008 AIR table as restated in the 2021 same-group validation table).
Bands 0-4, 5-8, and 9-12 are published AIR strata. magent does not return probability percents or operate-versus-observe orders.

Formula

AIR = vomiting + rif_pain + rebound_or_guarding (none 0, light 1, medium 2, strong 3) + (temperature_c >= 38.5) + WBC 10^9/L (<10 → 0; 10.0–14.9 → 1; ≥15.0 → 2) + neutrophil_percent (<70 → 0; 70–84 → 1; ≥85 → 2) + crp_mg_l (<10 → 0; 10–49 → 1; ≥50 → 2); max 12; bands 0-4 / 5-8 / 9-12

Citation

Title: The appendicitis inflammatory response score: a tool for the diagnosis of acute appendicitis that outperforms the Alvarado score
Authors: Andersson M, Andersson RE
Source: World J Surg. 2008;32(8):1843-1849
DOI: 10.1007/s00268-008-9649-y

Worked example

All findings absent

Given: crp_mg_l=5neutrophil_percent=60rebound_or_guarding=nonerif_pain=falsetemperature_c=37.0vomiting=falsewbc_ul=8000

vomiting false; rif_pain false; rebound_or_guarding none; temperature 37.0 < 38.5; WBC 8000 → 8.0 ×10^9/L < 10; neutrophils 60 < 70; CRP 5 mg/L < 10
Score = 0; band 0-4; max 12

Also searched as

AIR score
appendicitis inflammatory response
Andersson AIR
AIR appendicitis score
inflammatory response score
Andersson 2008 AIR

Try

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

/api/calc/air?vomiting=false&rif_pain=false&rebound_or_guarding=none&temperature_c=37.0&wbc_ul=8000&neutrophil_percent=60&crp_mg_l=5

Full URL: https://api.magentlab.com/api/calc/air?vomiting=false&rif_pain=false&rebound_or_guarding=none&temperature_c=37.0&wbc_ul=8000&neutrophil_percent=60&crp_mg_l=5

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/air?vomiting=false&rif_pain=false&rebound_or_guarding=none&temperature_c=37.0&wbc_ul=8000&neutrophil_percent=60&crp_mg_l=5"

Parameters

Name	Type	Required	Description
`vomiting`	boolean	required	Vomiting (Andersson 2008). true scores 1; false scores 0.
`rif_pain`	boolean	required	Pain in the right iliac fossa / right lower quadrant (Andersson 2008). true scores 1; false scores 0.
`rebound_or_guarding`	string	required · none, light, medium, strong	Caller-assigned rebound tenderness or muscular guarding (Andersson 2008). none scores 0; light 1; medium 2; strong 3. magent does not examine the abdomen.
`temperature_c`	number	required	Temperature in °C (30.0-45.0). ≥38.5 scores 1 (38.5 scores; 38.49 does not).
`wbc_k_ul`	number	optional	WBC in 10^3/µL (same as 10^9/L). Provide wbc_k_ul or wbc_ul. Range 0.01-500. Converted to ×10^9/L: <10 scores 0; 10.0-14.9 scores 1; ≥15.0 scores 2.
`wbc_ul`	number	optional	WBC in cells/µL (same as cells/mm^3). Provide wbc_k_ul or wbc_ul. Range 10-500000. Converted to ×10^9/L (= wbc_ul/1000): <10 scores 0; 10.0-14.9 scores 1; ≥15.0 scores 2.
`neutrophil_percent`	number	required	Neutrophil percent (0-100). <70 scores 0; 70-84 scores 1; ≥85 scores 2 (69.9 does not; 70 and 84 score 1; 85 scores 2).
`crp_mg_l`	number	required	C-reactive protein in mg/L (0-500), not mg/dL. <10 scores 0; 10-49 scores 1; ≥50 scores 2 (9.9 does not; 10 and 49 score 1; 50 scores 2).

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/air 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": [
    {
      "crp_mg_l": "5",
      "neutrophil_percent": "60",
      "rebound_or_guarding": "none",
      "rif_pain": "false",
      "temperature_c": "37.0",
      "vomiting": "false",
      "wbc_ul": "8000"
    },
    {
      "crp_mg_l": "5",
      "neutrophil_percent": "60",
      "rebound_or_guarding": "none",
      "rif_pain": "false",
      "temperature_c": "37.0",
      "vomiting": "false",
      "wbc_ul": "8000"
    }
  ]
}

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/air",
  "items": [
    {
      "components": [
        {
          "factor": "vomiting",
          "points": 0,
          "present": false
        },
        {
          "factor": "rif_pain",
          "points": 0,
          "present": false
        },
        {
          "value": "none",
          "factor": "rebound_or_guarding",
          "points": 0,
          "present": false
        },
        {
          "value": 37.0,
          "factor": "temperature_c",
          "points": 0,
          "present": false
        },
        {
          "value": 8.0e3,
          "factor": "wbc",
          "points": 0,
          "present": false
        },
        {
          "value": 60.0,
          "factor": "neutrophil_percent",
          "points": 0,
          "present": false
        },
        {
          "value": 5.0,
          "factor": "crp_mg_l",
          "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.",
      "citation": {
        "authors": "Andersson M, Andersson RE",
        "doi": "10.1007/s00268-008-9649-y",
        "id": "andersson-2008",
        "pmid": "18553045",
        "source": "World J Surg. 2008;32(8):1843-1849",
        "title": "The appendicitis inflammatory response score: a tool for the diagnosis of acute appendicitis that outperforms the Alvarado score"
      },
      "formula": "air",
      "formula_expression": "AIR = vomiting + rif_pain + rebound_or_guarding (none 0, light 1, medium 2, strong 3) + (temperature_c >= 38.5) + WBC 10^9/L (<10 → 0; 10.0–14.9 → 1; ≥15.0 → 2) + neutrophil_percent (<70 → 0; 70–84 → 1; ≥85 → 2) + crp_mg_l (<10 → 0; 10–49 → 1; ≥50 → 2); max 12; bands 0-4 / 5-8 / 9-12",
      "max_score": 12,
      "score": 0,
      "neutrophil_percent": 60.0,
      "temperature_c": 37.0,
      "wbc_ul": 8.0e3,
      "air_band": "0-4",
      "crp_mg_l": 5.0,
      "rebound_or_guarding": "none",
      "rif_pain": false,
      "vomiting": false,
      "wbc_10e9_l": 8.0
    },
    {
      "components": [
        {
          "factor": "vomiting",
          "points": 0,
          "present": false
        },
        {
          "factor": "rif_pain",
          "points": 0,
          "present": false
        },
        {
          "value": "none",
          "factor": "rebound_or_guarding",
          "points": 0,
          "present": false
        },
        {
          "value": 37.0,
          "factor": "temperature_c",
          "points": 0,
          "present": false
        },
        {
          "value": 8.0e3,
          "factor": "wbc",
          "points": 0,
          "present": false
        },
        {
          "value": 60.0,
          "factor": "neutrophil_percent",
          "points": 0,
          "present": false
        },
        {
          "value": 5.0,
          "factor": "crp_mg_l",
          "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.",
      "citation": {
        "authors": "Andersson M, Andersson RE",
        "doi": "10.1007/s00268-008-9649-y",
        "id": "andersson-2008",
        "pmid": "18553045",
        "source": "World J Surg. 2008;32(8):1843-1849",
        "title": "The appendicitis inflammatory response score: a tool for the diagnosis of acute appendicitis that outperforms the Alvarado score"
      },
      "formula": "air",
      "formula_expression": "AIR = vomiting + rif_pain + rebound_or_guarding (none 0, light 1, medium 2, strong 3) + (temperature_c >= 38.5) + WBC 10^9/L (<10 → 0; 10.0–14.9 → 1; ≥15.0 → 2) + neutrophil_percent (<70 → 0; 70–84 → 1; ≥85 → 2) + crp_mg_l (<10 → 0; 10–49 → 1; ≥50 → 2); max 12; bands 0-4 / 5-8 / 9-12",
      "max_score": 12,
      "score": 0,
      "neutrophil_percent": 60.0,
      "temperature_c": 37.0,
      "wbc_ul": 8.0e3,
      "air_band": "0-4",
      "crp_mg_l": 5.0,
      "rebound_or_guarding": "none",
      "rif_pain": false,
      "vomiting": false,
      "wbc_10e9_l": 8.0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	air
`formula_expression`	string	Exact expression used
`score`	integer	Total points 0-12
`max_score`	integer	Always 12
`air_band`	string	0-4 (low), 5-8 (indeterminate), or 9-12 (high) published Andersson 2008 strata. Not an operate-versus-observe order and not a percent.
`vomiting`	boolean	Parsed vomiting flag
`rif_pain`	boolean	Parsed right-iliac-fossa pain flag
`rebound_or_guarding`	string	Canonical none, light, medium, or strong
`temperature_c`	number	Temperature in °C used for scoring
`wbc_ul`	number	Normalized WBC in cells/µL used for scoring
`wbc_10e9_l`	number	WBC converted to ×10^9/L (wbc_ul / 1000) for Andersson 2008 bands
`neutrophil_percent`	number	Neutrophil percent used for scoring
`crp_mg_l`	number	CRP in mg/L used for scoring (not mg/dL)
`components`	array	Per-factor AIR points
`citation`	object	Andersson 2008 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "vomiting",
      "points": 0,
      "present": false
    },
    {
      "factor": "rif_pain",
      "points": 0,
      "present": false
    },
    {
      "value": "none",
      "factor": "rebound_or_guarding",
      "points": 0,
      "present": false
    },
    {
      "value": 37.0,
      "factor": "temperature_c",
      "points": 0,
      "present": false
    },
    {
      "value": 8.0e3,
      "factor": "wbc",
      "points": 0,
      "present": false
    },
    {
      "value": 60.0,
      "factor": "neutrophil_percent",
      "points": 0,
      "present": false
    },
    {
      "value": 5.0,
      "factor": "crp_mg_l",
      "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.",
  "citation": {
    "authors": "Andersson M, Andersson RE",
    "doi": "10.1007/s00268-008-9649-y",
    "id": "andersson-2008",
    "pmid": "18553045",
    "source": "World J Surg. 2008;32(8):1843-1849",
    "title": "The appendicitis inflammatory response score: a tool for the diagnosis of acute appendicitis that outperforms the Alvarado score"
  },
  "formula": "air",
  "formula_expression": "AIR = vomiting + rif_pain + rebound_or_guarding (none 0, light 1, medium 2, strong 3) + (temperature_c >= 38.5) + WBC 10^9/L (<10 → 0; 10.0–14.9 → 1; ≥15.0 → 2) + neutrophil_percent (<70 → 0; 70–84 → 1; ≥85 → 2) + crp_mg_l (<10 → 0; 10–49 → 1; ≥50 → 2); max 12; bands 0-4 / 5-8 / 9-12",
  "max_score": 12,
  "score": 0,
  "neutrophil_percent": 60.0,
  "temperature_c": 37.0,
  "wbc_ul": 8.0e3,
  "air_band": "0-4",
  "crp_mg_l": 5.0,
  "rebound_or_guarding": "none",
  "rif_pain": false,
  "vomiting": false,
  "wbc_10e9_l": 8.0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_flag`	boolean clinical flags must be true or false Returned before settlement; you are not charged.
400	`invalid_air_rebound`	rebound_or_guarding must be none, light, medium, or strong (Andersson 2008 AIR). Returned before settlement; you are not charged.
400	`invalid_temperature`	temperature_c must be a number from 30.0 to 45.0. 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_neutrophil_percent`	neutrophil_percent must be a number from 0 to 100 Returned before settlement; you are not charged.
400	`invalid_crp`	crp_mg_l must be a number from 0 to 500. 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

Alvarado score — Compute the Alvarado 1986 MANTRELS score from caller-assigned findings, temperature, WBC, and neutrophil percent.
Pediatric appendicitis score — Compute the Samuel 2002 pediatric appendicitis score from eight caller-assigned findings in children aged 4-15.

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.