Liver · LIVE

Fong clinical score (colorectal liver metastases)

Fong

Sum the five Fong 1999 preoperative criteria for colorectal liver metastases and return the 0–5 clinical score and whether it is potentially favorable (≤2).

LIVE $0.005 USDC GET /api/calc/fong

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

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

What it computes

Sum the five Fong 1999 preoperative criteria for colorectal liver metastases and return the 0–5 clinical score and whether it is potentially favorable (≤2).

When to use

When an agent already has the five published Fong 1999 flags assigned and must not invent a resectability decision, adjuvant protocol, or numeric CEA, size, or interval.

When not to use

Not a medical device.
Not a resectability decision or adjuvant protocol.
magent does not interpret imaging or pathology. Each flag is caller-assigned after the published inequalities (disease-free interval <12 months, more than one hepatic tumor, largest tumor >5 cm, CEA >200 ng/mL). Equality at 12 months, 5 cm, or 200 ng/mL does not meet Fong's "<" / ">".

Formula

Fong = node_positive_primary + dfi_lt_12_months + more_than_one_hepatic_tumor + largest_tumor_gt_5_cm + cea_gt_200; each 1; max 5

Citation

Title: Clinical score for predicting recurrence after hepatic resection for metastatic colorectal cancer: analysis of 1001 consecutive cases
Authors: Fong Y, Fortner J, Sun RL, Brennan MF, Blumgart LH
Source: Ann Surg. 1999;230(3):309-318
DOI: 10.1097/00000658-199909000-00004

Worked example

No criteria

Given: cea_gt_200=falsedfi_lt_12_months=falselargest_tumor_gt_5_cm=falsemore_than_one_hepatic_tumor=falsenode_positive_primary=false

score = 0
favorable true (threshold is ≤2)

Three criteria

Given: cea_gt_200=falsedfi_lt_12_months=truelargest_tumor_gt_5_cm=falsemore_than_one_hepatic_tumor=truenode_positive_primary=true

score = 3
favorable false

Also searched as

Fong score
Fong clinical risk score
colorectal liver metastasis score
Fong CRS
hepatic resection colorectal metastases
Fong 1999
CRLM clinical score

Try

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

/api/calc/fong?node_positive_primary=false&dfi_lt_12_months=false&more_than_one_hepatic_tumor=false&largest_tumor_gt_5_cm=false&cea_gt_200=false

Full URL: https://api.magentlab.com/api/calc/fong?node_positive_primary=false&dfi_lt_12_months=false&more_than_one_hepatic_tumor=false&largest_tumor_gt_5_cm=false&cea_gt_200=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/fong?node_positive_primary=false&dfi_lt_12_months=false&more_than_one_hepatic_tumor=false&largest_tumor_gt_5_cm=false&cea_gt_200=false"

Parameters

Name	Type	Required	Description
`node_positive_primary`	boolean	required	Node-positive primary (Fong 1999). true or false as assigned by the caller. magent does not interpret pathology.
`dfi_lt_12_months`	boolean	required	Disease-free interval from primary to metastases <12 months (Fong 1999). Caller already applied the published threshold; equality at 12 months does not meet. true or false.
`more_than_one_hepatic_tumor`	boolean	required	More than one hepatic tumor (Fong 1999). true or false as assigned by the caller. magent does not interpret imaging.
`largest_tumor_gt_5_cm`	boolean	required	Largest hepatic tumor >5 cm (Fong 1999). Caller already applied the published threshold; equality at 5 cm does not meet. true or false.
`cea_gt_200`	boolean	required	CEA >200 ng/mL (Fong 1999). Caller already applied the published threshold; equality at 200 ng/mL does not meet. true or false.

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/fong 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": [
    {
      "cea_gt_200": "false",
      "dfi_lt_12_months": "false",
      "largest_tumor_gt_5_cm": "false",
      "more_than_one_hepatic_tumor": "false",
      "node_positive_primary": "false"
    },
    {
      "cea_gt_200": "false",
      "dfi_lt_12_months": "false",
      "largest_tumor_gt_5_cm": "false",
      "more_than_one_hepatic_tumor": "false",
      "node_positive_primary": "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/fong",
  "items": [
    {
      "components": [
        {
          "factor": "node_positive_primary",
          "points": 0,
          "present": false
        },
        {
          "factor": "dfi_lt_12_months",
          "points": 0,
          "present": false
        },
        {
          "factor": "more_than_one_hepatic_tumor",
          "points": 0,
          "present": false
        },
        {
          "factor": "largest_tumor_gt_5_cm",
          "points": 0,
          "present": false
        },
        {
          "factor": "cea_gt_200",
          "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": "Fong Y, Fortner J, Sun RL, Brennan MF, Blumgart LH",
        "doi": "10.1097/00000658-199909000-00004",
        "id": "fong-1999",
        "pmid": "10493478",
        "source": "Ann Surg. 1999;230(3):309-318",
        "title": "Clinical score for predicting recurrence after hepatic resection for metastatic colorectal cancer: analysis of 1001 consecutive cases"
      },
      "formula": "fong",
      "formula_expression": "Fong = node_positive_primary + dfi_lt_12_months + more_than_one_hepatic_tumor + largest_tumor_gt_5_cm + cea_gt_200; each 1; max 5",
      "max_score": 5,
      "score": 0,
      "favorable": true
    },
    {
      "components": [
        {
          "factor": "node_positive_primary",
          "points": 0,
          "present": false
        },
        {
          "factor": "dfi_lt_12_months",
          "points": 0,
          "present": false
        },
        {
          "factor": "more_than_one_hepatic_tumor",
          "points": 0,
          "present": false
        },
        {
          "factor": "largest_tumor_gt_5_cm",
          "points": 0,
          "present": false
        },
        {
          "factor": "cea_gt_200",
          "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": "Fong Y, Fortner J, Sun RL, Brennan MF, Blumgart LH",
        "doi": "10.1097/00000658-199909000-00004",
        "id": "fong-1999",
        "pmid": "10493478",
        "source": "Ann Surg. 1999;230(3):309-318",
        "title": "Clinical score for predicting recurrence after hepatic resection for metastatic colorectal cancer: analysis of 1001 consecutive cases"
      },
      "formula": "fong",
      "formula_expression": "Fong = node_positive_primary + dfi_lt_12_months + more_than_one_hepatic_tumor + largest_tumor_gt_5_cm + cea_gt_200; each 1; max 5",
      "max_score": 5,
      "score": 0,
      "favorable": true
    }
  ]
}

Response

Field	Type	Description
`formula`	string	fong
`formula_expression`	string	Exact expression used
`score`	integer	Fong points 0-5
`max_score`	integer	5
`favorable`	boolean	true iff score ≤2 (Fong 1999: up to two criteria potentially favorable). Not a resectability decision.
`components`	array	Per-factor points
`citation`	object	Fong et al. Ann Surg 1999 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "node_positive_primary",
      "points": 0,
      "present": false
    },
    {
      "factor": "dfi_lt_12_months",
      "points": 0,
      "present": false
    },
    {
      "factor": "more_than_one_hepatic_tumor",
      "points": 0,
      "present": false
    },
    {
      "factor": "largest_tumor_gt_5_cm",
      "points": 0,
      "present": false
    },
    {
      "factor": "cea_gt_200",
      "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": "Fong Y, Fortner J, Sun RL, Brennan MF, Blumgart LH",
    "doi": "10.1097/00000658-199909000-00004",
    "id": "fong-1999",
    "pmid": "10493478",
    "source": "Ann Surg. 1999;230(3):309-318",
    "title": "Clinical score for predicting recurrence after hepatic resection for metastatic colorectal cancer: analysis of 1001 consecutive cases"
  },
  "formula": "fong",
  "formula_expression": "Fong = node_positive_primary + dfi_lt_12_months + more_than_one_hepatic_tumor + largest_tumor_gt_5_cm + cea_gt_200; each 1; max 5",
  "max_score": 5,
  "score": 0,
  "favorable": true
}

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_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

Child–Pugh — Compute the Child–Turcotte–Pugh cirrhosis severity score from bilirubin, albumin, INR, encephalopathy, and ascites.

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.