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Thakar ARF score after cardiac surgery

Thakar ARF score

Sum the Thakar 2005 preoperative points for dialysis-requiring acute renal failure after open-heart surgery and return the integer score (max 17) and published category (0–2 / 3–5 / 6–8 / 9–13).

LIVE $0.005 USDC GET /api/calc/thakar

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

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

What it computes

Sum the Thakar 2005 preoperative points for dialysis-requiring acute renal failure after open-heart surgery and return the integer score (max 17) and published category (0–2 / 3–5 / 6–8 / 9–13).

When to use

When an agent has caller-assigned sex, surgery type, preoperative creatinine, and the published boolean risk factors and needs the Thakar 2005 point total. Not a dialysis order. magent does not examine the patient.

When not to use

• Not a medical device and not a dialysis order.
• Not AKIN or RIFLE staging of a current creatinine change. This is a preoperative score for dialysis-requiring ARF after open-heart surgery.
• magent does not examine the patient. Sex, surgery type, CHF, LVEF <35%, preoperative IABP, COPD requiring medical therapy, insulin-requiring diabetes, previous cardiac surgery, and emergency surgery are caller-assigned.
• Creatinine bands follow the Thakar 2005 scoring table: <1.2 mg/dL scores 0; 1.2 to <2.1 scores 2; >=2.1 scores 5. 2.0 mg/dL scores 2. magent does not assay creatinine.
• Published categories are 0–2, 3–5, 6–8, and 9–13 (formed arbitrarily in the paper). Scores >=9 map to 9–13; the paper observed no patients above 13. Theoretical max is 17.

Formula

Thakar 2005 = female(1) + congestive_heart_failure(1) + lvef_lt_35(1) + preoperative_iabp(2) + copd(1) + insulin_diabetes(1) + previous_cardiac_surgery(1) + emergency_surgery(2) + surgery_type(cabg 0, valve 1, cabg_valve 2, other 2) + creatinine_mg_dl(<1.2: 0, 1.2 to <2.1: 2, >=2.1: 5); max 17; categories 0-2 / 3-5 / 6-8 / 9-13

Citation

Title

A clinical score to predict acute renal failure after cardiac surgery

Authors

Thakar CV, Arrigain S, Worley S, Yared JP, Paganini EP

Source

J Am Soc Nephrol. 2005;16(1):162-168

DOI

10.1681/ASN.2004040331

Worked example

Also searched as

• Thakar score
• Thakar ARF score
• cardiac surgery ARF score
• Thakar 2005
• acute renal failure after cardiac surgery
• dialysis risk after open-heart surgery
• Thakar renal failure score

Try

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

/api/calc/thakar?sex=male&surgery_type=cabg&creatinine_mg_dl=1.0&congestive_heart_failure=false&lvef_lt_35=false&preoperative_iabp=false&copd=false&insulin_diabetes=false&previous_cardiac_surgery=false&emergency_surgery=false

Full URL: https://api.magentlab.com/api/calc/thakar?sex=male&surgery_type=cabg&creatinine_mg_dl=1.0&congestive_heart_failure=false&lvef_lt_35=false&preoperative_iabp=false&copd=false&insulin_diabetes=false&previous_cardiac_surgery=false&emergency_surgery=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/thakar?sex=male&surgery_type=cabg&creatinine_mg_dl=1.0&congestive_heart_failure=false&lvef_lt_35=false&preoperative_iabp=false&copd=false&insulin_diabetes=false&previous_cardiac_surgery=false&emergency_surgery=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/thakar 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": [
    {
      "congestive_heart_failure": "false",
      "copd": "false",
      "creatinine_mg_dl": "1.0",
      "emergency_surgery": "false",
      "insulin_diabetes": "false",
      "lvef_lt_35": "false",
      "preoperative_iabp": "false",
      "previous_cardiac_surgery": "false",
      "sex": "male",
      "surgery_type": "cabg"
    },
    {
      "congestive_heart_failure": "false",
      "copd": "false",
      "creatinine_mg_dl": "1.0",
      "emergency_surgery": "false",
      "insulin_diabetes": "false",
      "lvef_lt_35": "false",
      "preoperative_iabp": "false",
      "previous_cardiac_surgery": "false",
      "sex": "male",
      "surgery_type": "cabg"
    }
  ]
}

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/thakar",
  "items": [
    {
      "components": [
        {
          "factor": "female",
          "points": 0,
          "present": false
        },
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "lvef_lt_35",
          "points": 0,
          "present": false
        },
        {
          "factor": "preoperative_iabp",
          "points": 0,
          "present": false
        },
        {
          "factor": "copd",
          "points": 0,
          "present": false
        },
        {
          "factor": "insulin_diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "previous_cardiac_surgery",
          "points": 0,
          "present": false
        },
        {
          "factor": "emergency_surgery",
          "points": 0,
          "present": false
        },
        {
          "value": "cabg",
          "factor": "surgery_type",
          "points": 0,
          "present": false
        },
        {
          "value": 1.0,
          "factor": "creatinine_mg_dl",
          "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": "Thakar CV, Arrigain S, Worley S, Yared JP, Paganini EP",
        "doi": "10.1681/ASN.2004040331",
        "id": "thakar-2005",
        "pmid": "15563569",
        "source": "J Am Soc Nephrol. 2005;16(1):162-168",
        "title": "A clinical score to predict acute renal failure after cardiac surgery"
      },
      "formula": "thakar",
      "formula_expression": "Thakar 2005 = female(1) + congestive_heart_failure(1) + lvef_lt_35(1) + preoperative_iabp(2) + copd(1) + insulin_diabetes(1) + previous_cardiac_surgery(1) + emergency_surgery(2) + surgery_type(cabg 0, valve 1, cabg_valve 2, other 2) + creatinine_mg_dl(<1.2: 0, 1.2 to <2.1: 2, >=2.1: 5); max 17; categories 0-2 / 3-5 / 6-8 / 9-13",
      "max_score": 17,
      "score": 0,
      "creatinine_mg_dl": 1.0,
      "sex": "male",
      "surgery_type": "cabg",
      "thakar_category": "0_to_2"
    },
    {
      "components": [
        {
          "factor": "female",
          "points": 0,
          "present": false
        },
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "lvef_lt_35",
          "points": 0,
          "present": false
        },
        {
          "factor": "preoperative_iabp",
          "points": 0,
          "present": false
        },
        {
          "factor": "copd",
          "points": 0,
          "present": false
        },
        {
          "factor": "insulin_diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "previous_cardiac_surgery",
          "points": 0,
          "present": false
        },
        {
          "factor": "emergency_surgery",
          "points": 0,
          "present": false
        },
        {
          "value": "cabg",
          "factor": "surgery_type",
          "points": 0,
          "present": false
        },
        {
          "value": 1.0,
          "factor": "creatinine_mg_dl",
          "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": "Thakar CV, Arrigain S, Worley S, Yared JP, Paganini EP",
        "doi": "10.1681/ASN.2004040331",
        "id": "thakar-2005",
        "pmid": "15563569",
        "source": "J Am Soc Nephrol. 2005;16(1):162-168",
        "title": "A clinical score to predict acute renal failure after cardiac surgery"
      },
      "formula": "thakar",
      "formula_expression": "Thakar 2005 = female(1) + congestive_heart_failure(1) + lvef_lt_35(1) + preoperative_iabp(2) + copd(1) + insulin_diabetes(1) + previous_cardiac_surgery(1) + emergency_surgery(2) + surgery_type(cabg 0, valve 1, cabg_valve 2, other 2) + creatinine_mg_dl(<1.2: 0, 1.2 to <2.1: 2, >=2.1: 5); max 17; categories 0-2 / 3-5 / 6-8 / 9-13",
      "max_score": 17,
      "score": 0,
      "creatinine_mg_dl": 1.0,
      "sex": "male",
      "surgery_type": "cabg",
      "thakar_category": "0_to_2"
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "factor": "female",
      "points": 0,
      "present": false
    },
    {
      "factor": "congestive_heart_failure",
      "points": 0,
      "present": false
    },
    {
      "factor": "lvef_lt_35",
      "points": 0,
      "present": false
    },
    {
      "factor": "preoperative_iabp",
      "points": 0,
      "present": false
    },
    {
      "factor": "copd",
      "points": 0,
      "present": false
    },
    {
      "factor": "insulin_diabetes",
      "points": 0,
      "present": false
    },
    {
      "factor": "previous_cardiac_surgery",
      "points": 0,
      "present": false
    },
    {
      "factor": "emergency_surgery",
      "points": 0,
      "present": false
    },
    {
      "value": "cabg",
      "factor": "surgery_type",
      "points": 0,
      "present": false
    },
    {
      "value": 1.0,
      "factor": "creatinine_mg_dl",
      "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": "Thakar CV, Arrigain S, Worley S, Yared JP, Paganini EP",
    "doi": "10.1681/ASN.2004040331",
    "id": "thakar-2005",
    "pmid": "15563569",
    "source": "J Am Soc Nephrol. 2005;16(1):162-168",
    "title": "A clinical score to predict acute renal failure after cardiac surgery"
  },
  "formula": "thakar",
  "formula_expression": "Thakar 2005 = female(1) + congestive_heart_failure(1) + lvef_lt_35(1) + preoperative_iabp(2) + copd(1) + insulin_diabetes(1) + previous_cardiac_surgery(1) + emergency_surgery(2) + surgery_type(cabg 0, valve 1, cabg_valve 2, other 2) + creatinine_mg_dl(<1.2: 0, 1.2 to <2.1: 2, >=2.1: 5); max 17; categories 0-2 / 3-5 / 6-8 / 9-13",
  "max_score": 17,
  "score": 0,
  "creatinine_mg_dl": 1.0,
  "sex": "male",
  "surgery_type": "cabg",
  "thakar_category": "0_to_2"
}

Client errors (HTTP 400)

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

Related tools

• AKIN — Apply Mehta 2007 Table 2 AKIN staging and return stage 0-3 as the worse of the creatinine and urine-output limbs, with initiated renal replacement therapy mapping to stage 3.
• RIFLE — Apply Bellomo 2004 Fig. 1 RIFLE classification and return the worse of the creatinine and urine-output limbs (none, risk, injury, failure), with persistent ARF beyond 4 weeks mapping to loss and ESRD beyond 3 months mapping to esrd.
• Mehran CIN risk score — Sum the Mehran 2004 eGFR model B integer score for contrast-induced nephropathy after PCI and return low (≤5), moderate (6–10), high (11–15), or very_high (≥16) with the development-set CIN 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. 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.