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AMI READMITS 30-day readmission score

READMITS

Sum the Nguyen 2018 first-day AMI READMITS predictors and return the integer score, Table 4 quintile, and mean predicted 30-day readmission percent.

LIVE $0.005 USDC GET /api/calc/readmits

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

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

What it computes

Sum the Nguyen 2018 first-day AMI READMITS predictors and return the integer score, Table 4 quintile, and mean predicted 30-day readmission percent.

When to use

When an agent needs the published first-day AMI READMITS point total within 24 hours of AMI admission and must not invent a PCI, reperfusion, or discharge order, or the full-stay model.

When not to use

  • Not a medical device and not a PCI, reperfusion, or discharge order. magent does not assay creatinine or natriuretic peptides, take blood pressure, or examine the patient.
  • First-day AMI READMITS only (Nguyen 2018 Table 2). Does not include the full-stay model's intravenous diuretics, discharge anemia, or post-acute care.
  • Sex is the published nonmale/female item (female scores 2). Not race.
  • Quintile percents are Table 4 mean predicted 30-day readmission risk (3/7/11/16/35%), not an individual measured rate.
  • Creatinine >2 mg/dL, elevated BNP or NT-proBNP, PCI within 24 hours, and SBP <100 mm Hg are caller-assigned booleans. magent does not convert units or read timestamps.

Formula

READMITS = creatinine_gt_2 (6) + elevated_bnp (8) + floor((age_years-18)/10) (1 per decade >18) + diabetes (4) + female (2) + no_pci_within_24h (1) + sbp_lt_100 (3); Nguyen 2018 first-day AMI READMITS Table 2; max 32 at age 100; Table 4 quintiles <=13 extremely_low 3%, 14-15 low 7%, 16-17 moderate 11%, 18-19 high 16%, >=20 extremely_high 35%

Citation

Title
Predicting 30-Day Hospital Readmissions in Acute Myocardial Infarction: The AMI "READMITS" (Renal Function, Elevated Brain Natriuretic Peptide, Age, Diabetes Mellitus, Nonmale Sex, Intervention with Timely Percutaneous Coronary Intervention, and Low Systolic Blood Pressure) Score
Authors
Nguyen OK, Makam AN, Clark C, et al.
Source
J Am Heart Assoc. 2018;7(8):e008882
DOI
10.1161/JAHA.118.008882

Worked example

Age 58 male, no first-day flags, PCI within 24 hours

Given: age_years=58creatinine_gt_2=falsediabetes=falseelevated_bnp=falsepci_within_24h=truesbp_lt_100=falsesex=male

  1. age_years 58 -> floor((58-18)/10) = 4; male -> 0; creatinine_gt_2 false -> 0; elevated_bnp false -> 0; diabetes false -> 0; pci_within_24h true -> 0; sbp_lt_100 false -> 0
  2. score = 4 (max 32); quintile extremely_low; Table 4 mean predicted 3%

Age 58 male, creatinine, elevated BNP, and diabetes (score 20 or more)

Given: age_years=58creatinine_gt_2=truediabetes=trueelevated_bnp=truepci_within_24h=truesbp_lt_100=falsesex=male

  1. age decades 4 + creatinine_gt_2 6 + elevated_bnp 8 + diabetes 4
  2. score = 22 (max 32); quintile extremely_high; Table 4 mean predicted 35%

Also searched as

  • AMI READMITS
  • Nguyen 2018 READMITS
  • 30-day AMI readmission score
  • first-day READMITS
  • AMI creatinine BNP readmission
  • READMITS quintile
  • Nguyen AMI readmission
  • timely PCI READMITS

Try

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

/api/calc/readmits?age_years=58&sex=male&creatinine_gt_2=false&elevated_bnp=false&diabetes=false&pci_within_24h=true&sbp_lt_100=false

Full URL: https://api.magentlab.com/api/calc/readmits?age_years=58&sex=male&creatinine_gt_2=false&elevated_bnp=false&diabetes=false&pci_within_24h=true&sbp_lt_100=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/readmits?age_years=58&sex=male&creatinine_gt_2=false&elevated_bnp=false&diabetes=false&pci_within_24h=true&sbp_lt_100=false"

Parameters

Name Type Required Description
age_years integer required Age in years (18-100). Nguyen 2018: 1 point per decade over 18, floor((age_years-18)/10).
sex string required · female, male female or male (Nguyen 2018 nonmale sex). Female scores 2. Male scores 0. A published sex item, not race.
creatinine_gt_2 boolean required Whether serum creatinine was >2 mg/dL within the first 24 hours (Nguyen 2018: 6 points). Caller-assigned. magent does not assay creatinine.
elevated_bnp boolean required Whether BNP was >=50 pg/mL or NT-proBNP was >=125 pg/mL within the first 24 hours (Nguyen 2018: 8 points). Caller-assigned. magent does not assay natriuretic peptides.
diabetes boolean required Diabetes mellitus history (Nguyen 2018: 4 points). true or false.
pci_within_24h boolean required Whether PCI occurred within the first 24 hours (Nguyen 2018: false scores 1; true scores 0). Caller-assigned. magent does not read timestamps or the angiogram.
sbp_lt_100 boolean required Whether systolic blood pressure was <100 mm Hg within the first 24 hours (Nguyen 2018: 3 points). Caller-assigned boolean; magent does not take an SBP number.

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/readmits 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": [
    {
      "age_years": "58",
      "creatinine_gt_2": "false",
      "diabetes": "false",
      "elevated_bnp": "false",
      "pci_within_24h": "true",
      "sbp_lt_100": "false",
      "sex": "male"
    },
    {
      "age_years": "58",
      "creatinine_gt_2": "false",
      "diabetes": "false",
      "elevated_bnp": "false",
      "pci_within_24h": "true",
      "sbp_lt_100": "false",
      "sex": "male"
    }
  ]
}

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/readmits",
  "items": [
    {
      "components": [
        {
          "factor": "creatinine_gt_2",
          "points": 0,
          "present": false
        },
        {
          "factor": "elevated_bnp",
          "points": 0,
          "present": false
        },
        {
          "value": 58,
          "factor": "age_years",
          "points": 4,
          "present": true
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "value": "male",
          "factor": "sex",
          "points": 0,
          "present": false
        },
        {
          "factor": "no_pci_within_24h",
          "points": 0,
          "present": false
        },
        {
          "factor": "sbp_lt_100",
          "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": "Nguyen OK, Makam AN, Clark C, et al.",
        "doi": "10.1161/JAHA.118.008882",
        "id": "nguyen-2018",
        "pmid": "29666144",
        "source": "J Am Heart Assoc. 2018;7(8):e008882",
        "title": "Predicting 30-Day Hospital Readmissions in Acute Myocardial Infarction: The AMI \"READMITS\" (Renal Function, Elevated Brain Natriuretic Peptide, Age, Diabetes Mellitus, Nonmale Sex, Intervention with Timely Percutaneous Coronary Intervention, and Low Systolic Blood Pressure) Score"
      },
      "formula": "readmits",
      "formula_expression": "READMITS = creatinine_gt_2 (6) + elevated_bnp (8) + floor((age_years-18)/10) (1 per decade >18) + diabetes (4) + female (2) + no_pci_within_24h (1) + sbp_lt_100 (3); Nguyen 2018 first-day AMI READMITS Table 2; max 32 at age 100; Table 4 quintiles <=13 extremely_low 3%, 14-15 low 7%, 16-17 moderate 11%, 18-19 high 16%, >=20 extremely_high 35%",
      "age_years": 58,
      "max_score": 32,
      "score": 4,
      "sex": "male",
      "diabetes": false,
      "age_decades": 4,
      "creatinine_gt_2": false,
      "elevated_bnp": false,
      "pci_within_24h": true,
      "predicted_readmission_percent": 3,
      "quintile": "extremely_low",
      "sbp_lt_100": false
    },
    {
      "components": [
        {
          "factor": "creatinine_gt_2",
          "points": 0,
          "present": false
        },
        {
          "factor": "elevated_bnp",
          "points": 0,
          "present": false
        },
        {
          "value": 58,
          "factor": "age_years",
          "points": 4,
          "present": true
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "value": "male",
          "factor": "sex",
          "points": 0,
          "present": false
        },
        {
          "factor": "no_pci_within_24h",
          "points": 0,
          "present": false
        },
        {
          "factor": "sbp_lt_100",
          "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": "Nguyen OK, Makam AN, Clark C, et al.",
        "doi": "10.1161/JAHA.118.008882",
        "id": "nguyen-2018",
        "pmid": "29666144",
        "source": "J Am Heart Assoc. 2018;7(8):e008882",
        "title": "Predicting 30-Day Hospital Readmissions in Acute Myocardial Infarction: The AMI \"READMITS\" (Renal Function, Elevated Brain Natriuretic Peptide, Age, Diabetes Mellitus, Nonmale Sex, Intervention with Timely Percutaneous Coronary Intervention, and Low Systolic Blood Pressure) Score"
      },
      "formula": "readmits",
      "formula_expression": "READMITS = creatinine_gt_2 (6) + elevated_bnp (8) + floor((age_years-18)/10) (1 per decade >18) + diabetes (4) + female (2) + no_pci_within_24h (1) + sbp_lt_100 (3); Nguyen 2018 first-day AMI READMITS Table 2; max 32 at age 100; Table 4 quintiles <=13 extremely_low 3%, 14-15 low 7%, 16-17 moderate 11%, 18-19 high 16%, >=20 extremely_high 35%",
      "age_years": 58,
      "max_score": 32,
      "score": 4,
      "sex": "male",
      "diabetes": false,
      "age_decades": 4,
      "creatinine_gt_2": false,
      "elevated_bnp": false,
      "pci_within_24h": true,
      "predicted_readmission_percent": 3,
      "quintile": "extremely_low",
      "sbp_lt_100": false
    }
  ]
}

Response

Field Type Description
formula string readmits
formula_expression string Exact expression used
score integer First-day READMITS points; 0-32 at the age 18-100 clamp
max_score integer 32 (age 100 plus all other items)
quintile string Nguyen 2018 Table 4: extremely_low (<=13), low (14-15), moderate (16-17), high (18-19), or extremely_high (>=20)
predicted_readmission_percent integer Table 4 mean predicted 30-day readmission percent: 3, 7, 11, 16, or 35
age_years integer Age in years used
age_decades integer floor((age_years-18)/10) points from age
sex string female or male used
creatinine_gt_2 boolean Caller-assigned creatinine >2 mg/dL flag
elevated_bnp boolean Caller-assigned elevated BNP or NT-proBNP flag
diabetes boolean Caller-assigned diabetes history flag
pci_within_24h boolean Caller-assigned PCI within 24 hours flag
sbp_lt_100 boolean Caller-assigned SBP <100 mm Hg flag
components array Per-factor points
citation object Nguyen et al. J Am Heart Assoc 2018 citation
disclaimer string Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "creatinine_gt_2",
      "points": 0,
      "present": false
    },
    {
      "factor": "elevated_bnp",
      "points": 0,
      "present": false
    },
    {
      "value": 58,
      "factor": "age_years",
      "points": 4,
      "present": true
    },
    {
      "factor": "diabetes",
      "points": 0,
      "present": false
    },
    {
      "value": "male",
      "factor": "sex",
      "points": 0,
      "present": false
    },
    {
      "factor": "no_pci_within_24h",
      "points": 0,
      "present": false
    },
    {
      "factor": "sbp_lt_100",
      "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": "Nguyen OK, Makam AN, Clark C, et al.",
    "doi": "10.1161/JAHA.118.008882",
    "id": "nguyen-2018",
    "pmid": "29666144",
    "source": "J Am Heart Assoc. 2018;7(8):e008882",
    "title": "Predicting 30-Day Hospital Readmissions in Acute Myocardial Infarction: The AMI \"READMITS\" (Renal Function, Elevated Brain Natriuretic Peptide, Age, Diabetes Mellitus, Nonmale Sex, Intervention with Timely Percutaneous Coronary Intervention, and Low Systolic Blood Pressure) Score"
  },
  "formula": "readmits",
  "formula_expression": "READMITS = creatinine_gt_2 (6) + elevated_bnp (8) + floor((age_years-18)/10) (1 per decade >18) + diabetes (4) + female (2) + no_pci_within_24h (1) + sbp_lt_100 (3); Nguyen 2018 first-day AMI READMITS Table 2; max 32 at age 100; Table 4 quintiles <=13 extremely_low 3%, 14-15 low 7%, 16-17 moderate 11%, 18-19 high 16%, >=20 extremely_high 35%",
  "age_years": 58,
  "max_score": 32,
  "score": 4,
  "sex": "male",
  "diabetes": false,
  "age_decades": 4,
  "creatinine_gt_2": false,
  "elevated_bnp": false,
  "pci_within_24h": true,
  "predicted_readmission_percent": 3,
  "quintile": "extremely_low",
  "sbp_lt_100": false
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_readmits READMITS needs Nguyen 2018 first-day creatinine, natriuretic peptide, age, diabetes, sex, PCI, and systolic BP in published ranges. 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.

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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.