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EVendo score

EVendo

Compute the Dong 2019 EVendo score from INR, AST, platelet count, BUN, hemoglobin, and ascites in US conventional units, rounded to 2 decimals, and whether that score is strictly below the published 3.90 cutoff.

LIVE $0.005 USDC GET /api/calc/evendo

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

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

What it computes

Compute the Dong 2019 EVendo score from INR, AST, platelet count, BUN, hemoglobin, and ascites in US conventional units, rounded to 2 decimals, and whether that score is strictly below the published 3.90 cutoff.

When to use

When an agent already has INR, AST, platelets, BUN, hemoglobin, and an ascites assignment and needs the published Dong 2019 EVendo arithmetic and 3.90 cutoff, not a varices diagnosis, endoscopy order, or invented risk class.

When not to use

• Not a medical device. Not a varices diagnosis or an endoscopy order. magent does not assay labs.
• Dong 2019 published cutoff is strictly below 3.90 (an EVendo score below 3.90 would have spared EGDs). magent does not invent extra risk classes or endoscopy-sparing percents.
• US conventional units only (AST U/L, platelets 10^3/µL, BUN mg/dL, hemoglobin g/dL). magent does not convert SI units.
• Ascites is a caller-assigned flag. magent does not examine the abdomen.

Formula

A = (8.5 * inr) + (ast_u_l / 35); B = (platelets_k_ul / 150) + (bun_mg_dl / 20) + (hemoglobin_g_dl / 15); evendo = A / B + (1 if ascites else 0); cutoff strictly below 3.90 (Dong 2019)

Citation

Title

Machine learning-based development and validation of a scoring system for screening high-risk esophageal varices

Authors

Dong TS, Kalani A, Aby ES, Le L, Luu K, Hauer M, Kamath R, Lindor KD, Tabibian JH

Source

Clin Gastroenterol Hepatol. 2019;17(9):1894-1901.e1

DOI

10.1016/j.cgh.2019.01.025

Worked example

Also searched as

• EVendo
• EVendo score
• Dong EVendo
• esophageal varices score
• varices screening score
• EVendo INR AST platelets
• high-risk esophageal varices
• Dong 2019 varices score

Try

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

/api/calc/evendo?inr=1.0&ast_u_l=35&platelets_k_ul=150&bun_mg_dl=20&hemoglobin_g_dl=15&ascites=false

Full URL: https://api.magentlab.com/api/calc/evendo?inr=1.0&ast_u_l=35&platelets_k_ul=150&bun_mg_dl=20&hemoglobin_g_dl=15&ascites=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/evendo?inr=1.0&ast_u_l=35&platelets_k_ul=150&bun_mg_dl=20&hemoglobin_g_dl=15&ascites=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/evendo 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": [
    {
      "ascites": "false",
      "ast_u_l": "35",
      "bun_mg_dl": "20",
      "hemoglobin_g_dl": "15",
      "inr": "1.0",
      "platelets_k_ul": "150"
    },
    {
      "ascites": "false",
      "ast_u_l": "35",
      "bun_mg_dl": "20",
      "hemoglobin_g_dl": "15",
      "inr": "1.0",
      "platelets_k_ul": "150"
    }
  ]
}

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/evendo",
  "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": "Dong TS, Kalani A, Aby ES, Le L, Luu K, Hauer M, Kamath R, Lindor KD, Tabibian JH",
        "doi": "10.1016/j.cgh.2019.01.025",
        "id": "dong-2019",
        "pmid": "30708109",
        "source": "Clin Gastroenterol Hepatol. 2019;17(9):1894-1901.e1",
        "title": "Machine learning-based development and validation of a scoring system for screening high-risk esophageal varices"
      },
      "formula": "evendo",
      "formula_expression": "A = (8.5 * inr) + (ast_u_l / 35); B = (platelets_k_ul / 150) + (bun_mg_dl / 20) + (hemoglobin_g_dl / 15); evendo = A / B + (1 if ascites else 0); cutoff strictly below 3.90 (Dong 2019)",
      "ast_u_l": 35.0,
      "inr": 1.0,
      "bun_mg_dl": 20.0,
      "hemoglobin_g_dl": 15.0,
      "ascites": false,
      "below_cutoff_3_90": true,
      "evendo": 3.17,
      "platelets_k_ul": 150.0
    },
    {
      "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": "Dong TS, Kalani A, Aby ES, Le L, Luu K, Hauer M, Kamath R, Lindor KD, Tabibian JH",
        "doi": "10.1016/j.cgh.2019.01.025",
        "id": "dong-2019",
        "pmid": "30708109",
        "source": "Clin Gastroenterol Hepatol. 2019;17(9):1894-1901.e1",
        "title": "Machine learning-based development and validation of a scoring system for screening high-risk esophageal varices"
      },
      "formula": "evendo",
      "formula_expression": "A = (8.5 * inr) + (ast_u_l / 35); B = (platelets_k_ul / 150) + (bun_mg_dl / 20) + (hemoglobin_g_dl / 15); evendo = A / B + (1 if ascites else 0); cutoff strictly below 3.90 (Dong 2019)",
      "ast_u_l": 35.0,
      "inr": 1.0,
      "bun_mg_dl": 20.0,
      "hemoglobin_g_dl": 15.0,
      "ascites": false,
      "below_cutoff_3_90": true,
      "evendo": 3.17,
      "platelets_k_ul": 150.0
    }
  ]
}

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": "Dong TS, Kalani A, Aby ES, Le L, Luu K, Hauer M, Kamath R, Lindor KD, Tabibian JH",
    "doi": "10.1016/j.cgh.2019.01.025",
    "id": "dong-2019",
    "pmid": "30708109",
    "source": "Clin Gastroenterol Hepatol. 2019;17(9):1894-1901.e1",
    "title": "Machine learning-based development and validation of a scoring system for screening high-risk esophageal varices"
  },
  "formula": "evendo",
  "formula_expression": "A = (8.5 * inr) + (ast_u_l / 35); B = (platelets_k_ul / 150) + (bun_mg_dl / 20) + (hemoglobin_g_dl / 15); evendo = A / B + (1 if ascites else 0); cutoff strictly below 3.90 (Dong 2019)",
  "ast_u_l": 35.0,
  "inr": 1.0,
  "bun_mg_dl": 20.0,
  "hemoglobin_g_dl": 15.0,
  "ascites": false,
  "below_cutoff_3_90": true,
  "evendo": 3.17,
  "platelets_k_ul": 150.0
}

Client errors (HTTP 400)

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

Related tools

• Child–Pugh — Compute the Child–Turcotte–Pugh cirrhosis severity score from bilirubin, albumin, INR, encephalopathy, and ascites.
• MELD — Compute the Kamath 2001 model for end-stage liver disease (MELD) integer from creatinine, bilirubin, INR, and cholestatic or alcoholic etiology.

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.