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Mayo ulcerative colitis disease-activity index

Mayo DAI

Sum four caller-assigned Schroeder 1987 ulcerative colitis disease-activity index items (each integer 0-3) and return the total (max 12). Does not return later remission or activity bands.

LIVE $0.005 USDC GET /api/calc/mayo_uc

Markdown: /docs/mayo-uc.md · Canonical: https://magentlab.com/docs/mayo-uc

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

What it computes

Sum four caller-assigned Schroeder 1987 ulcerative colitis disease-activity index items (each integer 0-3) and return the total (max 12). Does not return later remission or activity bands.

When to use

When an agent has already assigned Schroeder 1987 stool frequency, rectal bleeding, endoscopy, and physician global integers and needs the four-item total, not a diagnosis, later Mayo cutoffs, PUCAI, or the Mayo SPN nodule model.

When not to use

Not a medical device and not a diagnosis of ulcerative colitis or a treatment order.
Each of the four items is a caller-assigned integer 0-3 from Schroeder 1987. magent does not count stools, examine the patient, or perform endoscopy.
Schroeder 1987 did not publish remission, mild, moderate, or severe cutoffs for the total score. magent returns score and max_score only and does not apply later Mayo or partial-Mayo bands.
Full four-item disease-activity index including endoscopy. Not PUCAI and not the Mayo Clinic solitary-pulmonary-nodule model.

Formula

Mayo DAI = stool_frequency + rectal_bleeding + endoscopy + physician_global; Schroeder 1987 caller-assigned integers 0-3 each; max 12; no published total-score activity bands

Citation

Title: Coated oral 5-aminosalicylic acid therapy for mildly to moderately active ulcerative colitis. A randomized study
Authors: Schroeder KW, Tremaine WJ, Ilstrup DM
Source: N Engl J Med. 1987;317(26):1625-1629
DOI: 10.1056/NEJM198712243172603

Worked example

All items 0

Given: endoscopy=0physician_global=0rectal_bleeding=0stool_frequency=0

stool_frequency 0 + rectal_bleeding 0 + endoscopy 0 + physician_global 0
Score = 0 (max 12). No activity band.

All items 3

Given: endoscopy=3physician_global=3rectal_bleeding=3stool_frequency=3

stool_frequency 3 + rectal_bleeding 3 + endoscopy 3 + physician_global 3
Score = 12 (max 12). No activity band.

Also searched as

Mayo score
Mayo Clinic score
ulcerative colitis DAI
Schroeder Mayo
Mayo DAI
UC disease activity index
Mayo UC score

Try

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

/api/calc/mayo_uc?stool_frequency=0&rectal_bleeding=0&endoscopy=0&physician_global=0

Full URL: https://api.magentlab.com/api/calc/mayo_uc?stool_frequency=0&rectal_bleeding=0&endoscopy=0&physician_global=0

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/mayo_uc?stool_frequency=0&rectal_bleeding=0&endoscopy=0&physician_global=0"

Parameters

Name	Type	Required	Description
`stool_frequency`	integer	required	Caller-assigned Schroeder 1987 stool frequency (integer 0-3): 0 normal number of stools for this patient; 1 = 1-2 stools/day more than normal; 2 = 3-4 more; 3 = 5 or more more than normal. magent does not count stools.
`rectal_bleeding`	integer	required	Caller-assigned Schroeder 1987 rectal bleeding (integer 0-3): 0 none; 1 streaks of blood with stool less than half the time; 2 obvious blood with stool most of the time; 3 blood alone passed. magent does not examine the patient.
`endoscopy`	integer	required	Caller-assigned Schroeder 1987 endoscopy / flexible proctosigmoidoscopy (integer 0-3): 0 normal or inactive; 1 mild (erythema, decreased vascular pattern, mild friability); 2 moderate (marked erythema, absent vascular pattern, friability, erosions); 3 severe (spontaneous bleeding, ulceration). magent does not perform endoscopy.
`physician_global`	integer	required	Caller-assigned Schroeder 1987 physician's global assessment (integer 0-3): 0 normal; 1 mild; 2 moderate; 3 severe. magent does not examine the patient.

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/mayo_uc 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": [
    {
      "endoscopy": "0",
      "physician_global": "0",
      "rectal_bleeding": "0",
      "stool_frequency": "0"
    },
    {
      "endoscopy": "0",
      "physician_global": "0",
      "rectal_bleeding": "0",
      "stool_frequency": "0"
    }
  ]
}

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/mayo_uc",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "stool_frequency",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "rectal_bleeding",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "endoscopy",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "physician_global",
          "points": 0,
          "present": true
        }
      ],
      "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": "Schroeder KW, Tremaine WJ, Ilstrup DM",
        "doi": "10.1056/NEJM198712243172603",
        "id": "schroeder-1987",
        "pmid": "3317057",
        "source": "N Engl J Med. 1987;317(26):1625-1629",
        "title": "Coated oral 5-aminosalicylic acid therapy for mildly to moderately active ulcerative colitis. A randomized study"
      },
      "formula": "mayo_uc",
      "formula_expression": "Mayo DAI = stool_frequency + rectal_bleeding + endoscopy + physician_global; Schroeder 1987 caller-assigned integers 0-3 each; max 12; no published total-score activity bands",
      "max_score": 12,
      "score": 0,
      "endoscopy": 0,
      "physician_global": 0,
      "rectal_bleeding": 0,
      "stool_frequency": 0
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "stool_frequency",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "rectal_bleeding",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "endoscopy",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "physician_global",
          "points": 0,
          "present": true
        }
      ],
      "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": "Schroeder KW, Tremaine WJ, Ilstrup DM",
        "doi": "10.1056/NEJM198712243172603",
        "id": "schroeder-1987",
        "pmid": "3317057",
        "source": "N Engl J Med. 1987;317(26):1625-1629",
        "title": "Coated oral 5-aminosalicylic acid therapy for mildly to moderately active ulcerative colitis. A randomized study"
      },
      "formula": "mayo_uc",
      "formula_expression": "Mayo DAI = stool_frequency + rectal_bleeding + endoscopy + physician_global; Schroeder 1987 caller-assigned integers 0-3 each; max 12; no published total-score activity bands",
      "max_score": 12,
      "score": 0,
      "endoscopy": 0,
      "physician_global": 0,
      "rectal_bleeding": 0,
      "stool_frequency": 0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	mayo_uc
`formula_expression`	string	Exact expression used
`score`	integer	Schroeder 1987 disease-activity index points 0-12
`max_score`	integer	Always 12
`stool_frequency`	integer	Caller-assigned stool frequency 0-3
`rectal_bleeding`	integer	Caller-assigned rectal bleeding 0-3
`endoscopy`	integer	Caller-assigned endoscopy 0-3
`physician_global`	integer	Caller-assigned physician global 0-3
`components`	array	Per-item caller-assigned points
`citation`	object	Schroeder et al. N Engl J Med 1987 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "stool_frequency",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "rectal_bleeding",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "endoscopy",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "physician_global",
      "points": 0,
      "present": true
    }
  ],
  "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": "Schroeder KW, Tremaine WJ, Ilstrup DM",
    "doi": "10.1056/NEJM198712243172603",
    "id": "schroeder-1987",
    "pmid": "3317057",
    "source": "N Engl J Med. 1987;317(26):1625-1629",
    "title": "Coated oral 5-aminosalicylic acid therapy for mildly to moderately active ulcerative colitis. A randomized study"
  },
  "formula": "mayo_uc",
  "formula_expression": "Mayo DAI = stool_frequency + rectal_bleeding + endoscopy + physician_global; Schroeder 1987 caller-assigned integers 0-3 each; max 12; no published total-score activity bands",
  "max_score": 12,
  "score": 0,
  "endoscopy": 0,
  "physician_global": 0,
  "rectal_bleeding": 0,
  "stool_frequency": 0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_mayo_item`	stool_frequency, rectal_bleeding, endoscopy, and physician_global must each be an integer 0-3 (Schroeder 1987). 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

PUCAI — Sum six caller-assigned Turner 2007 PUCAI item points and return the published total (max 85) with activity band.
HBI — Sum Harvey 1980 simple-index items (previous-day well-being, abdominal pain, liquid stools, abdominal mass, and one point per listed complication) and return the total. Does not return later remission or activity bands.

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.