Hemodynamics · LIVE

H2FPEF score

H2FPEF

Sum the Reddy 2018 H2FPEF points score (six components, max 9) and return score and max_score only.

LIVE $0.005 USDC GET /api/calc/h2fpef

Markdown: /docs/h2fpef.md · Canonical: https://magentlab.com/docs/h2fpef

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

What it computes

Sum the Reddy 2018 H2FPEF points score (six components, max 9) and return score and max_score only.

When to use

When an agent has caller-supplied BMI, age, antihypertensive-count flag, AF flag, echo PASP flag, and E/e' flag and needs the published Reddy 2018 points total, not the continuous nomogram, not HFA-PEFF, and not a HFpEF diagnosis or cath decision.

When not to use

• Not a medical device. magent does not diagnose HFpEF and does not examine the patient.
• Not a HFpEF diagnosis, treatment order, or cardiac-catheterization substitute.
• This is the Reddy 2018 H2FPEF points score only (0-9). It is not the paper's continuous logistic nomogram and not HFA-PEFF. Probability classes (0-1 / 2-5 / 6-9) are not returned.
• magent does not read echo. pasp_gt_35 and e_over_e_prime_gt_9 are caller-assigned flags (PASP > 35 mm Hg; E/e' > 9).
• magent does not compute BMI from height and weight. BMI 30 and age 60 do not score (strict greater-than).

Formula

H2FPEF = 2*(bmi_kg_m2>30) + antihypertensive_ge_2 + 3*atrial_fibrillation + pasp_gt_35 + (age>60) + e_over_e_prime_gt_9; max 9 (Reddy 2018 points score; not the continuous nomogram, not HFA-PEFF)

Citation

Title

A Simple, Evidence-Based Approach to Help Guide Diagnosis of Heart Failure With Preserved Ejection Fraction

Authors

Reddy YNV, Carter RE, Obokata M, Redfield MM, Borlaug BA

Source

Circulation. 2018;138(9):861-870

DOI

10.1161/CIRCULATIONAHA.118.034646

Worked example

Also searched as

• H2FPEF
• H2FPEF score
• Reddy HFpEF score
• heart failure with preserved ejection fraction score
• HFpEF points score
• H2FPEF Reddy 2018

Try

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

/api/calc/h2fpef?age=50&bmi_kg_m2=25&antihypertensive_ge_2=false&atrial_fibrillation=false&pasp_gt_35=false&e_over_e_prime_gt_9=false

Full URL: https://api.magentlab.com/api/calc/h2fpef?age=50&bmi_kg_m2=25&antihypertensive_ge_2=false&atrial_fibrillation=false&pasp_gt_35=false&e_over_e_prime_gt_9=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/h2fpef?age=50&bmi_kg_m2=25&antihypertensive_ge_2=false&atrial_fibrillation=false&pasp_gt_35=false&e_over_e_prime_gt_9=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/h2fpef 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": "50",
      "antihypertensive_ge_2": "false",
      "atrial_fibrillation": "false",
      "bmi_kg_m2": "25",
      "e_over_e_prime_gt_9": "false",
      "pasp_gt_35": "false"
    },
    {
      "age": "50",
      "antihypertensive_ge_2": "false",
      "atrial_fibrillation": "false",
      "bmi_kg_m2": "25",
      "e_over_e_prime_gt_9": "false",
      "pasp_gt_35": "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/h2fpef",
  "items": [
    {
      "components": [
        {
          "value": 25.0,
          "factor": "obesity",
          "points": 0,
          "present": false
        },
        {
          "factor": "antihypertensive_ge_2",
          "points": 0,
          "present": false
        },
        {
          "factor": "atrial_fibrillation",
          "points": 0,
          "present": false
        },
        {
          "factor": "pasp_gt_35",
          "points": 0,
          "present": false
        },
        {
          "value": 50,
          "factor": "age_gt_60",
          "points": 0,
          "present": false
        },
        {
          "factor": "e_over_e_prime_gt_9",
          "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.",
      "age_years": 50,
      "citation": {
        "authors": "Reddy YNV, Carter RE, Obokata M, Redfield MM, Borlaug BA",
        "doi": "10.1161/CIRCULATIONAHA.118.034646",
        "id": "reddy-2018",
        "pmid": "29792299",
        "source": "Circulation. 2018;138(9):861-870",
        "title": "A Simple, Evidence-Based Approach to Help Guide Diagnosis of Heart Failure With Preserved Ejection Fraction"
      },
      "formula": "h2fpef",
      "formula_expression": "H2FPEF = 2*(bmi_kg_m2>30) + antihypertensive_ge_2 + 3*atrial_fibrillation + pasp_gt_35 + (age>60) + e_over_e_prime_gt_9; max 9 (Reddy 2018 points score; not the continuous nomogram, not HFA-PEFF)",
      "max_score": 9,
      "score": 0,
      "bmi_kg_m2": 25.0
    },
    {
      "components": [
        {
          "value": 25.0,
          "factor": "obesity",
          "points": 0,
          "present": false
        },
        {
          "factor": "antihypertensive_ge_2",
          "points": 0,
          "present": false
        },
        {
          "factor": "atrial_fibrillation",
          "points": 0,
          "present": false
        },
        {
          "factor": "pasp_gt_35",
          "points": 0,
          "present": false
        },
        {
          "value": 50,
          "factor": "age_gt_60",
          "points": 0,
          "present": false
        },
        {
          "factor": "e_over_e_prime_gt_9",
          "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.",
      "age_years": 50,
      "citation": {
        "authors": "Reddy YNV, Carter RE, Obokata M, Redfield MM, Borlaug BA",
        "doi": "10.1161/CIRCULATIONAHA.118.034646",
        "id": "reddy-2018",
        "pmid": "29792299",
        "source": "Circulation. 2018;138(9):861-870",
        "title": "A Simple, Evidence-Based Approach to Help Guide Diagnosis of Heart Failure With Preserved Ejection Fraction"
      },
      "formula": "h2fpef",
      "formula_expression": "H2FPEF = 2*(bmi_kg_m2>30) + antihypertensive_ge_2 + 3*atrial_fibrillation + pasp_gt_35 + (age>60) + e_over_e_prime_gt_9; max 9 (Reddy 2018 points score; not the continuous nomogram, not HFA-PEFF)",
      "max_score": 9,
      "score": 0,
      "bmi_kg_m2": 25.0
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 25.0,
      "factor": "obesity",
      "points": 0,
      "present": false
    },
    {
      "factor": "antihypertensive_ge_2",
      "points": 0,
      "present": false
    },
    {
      "factor": "atrial_fibrillation",
      "points": 0,
      "present": false
    },
    {
      "factor": "pasp_gt_35",
      "points": 0,
      "present": false
    },
    {
      "value": 50,
      "factor": "age_gt_60",
      "points": 0,
      "present": false
    },
    {
      "factor": "e_over_e_prime_gt_9",
      "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.",
  "age_years": 50,
  "citation": {
    "authors": "Reddy YNV, Carter RE, Obokata M, Redfield MM, Borlaug BA",
    "doi": "10.1161/CIRCULATIONAHA.118.034646",
    "id": "reddy-2018",
    "pmid": "29792299",
    "source": "Circulation. 2018;138(9):861-870",
    "title": "A Simple, Evidence-Based Approach to Help Guide Diagnosis of Heart Failure With Preserved Ejection Fraction"
  },
  "formula": "h2fpef",
  "formula_expression": "H2FPEF = 2*(bmi_kg_m2>30) + antihypertensive_ge_2 + 3*atrial_fibrillation + pasp_gt_35 + (age>60) + e_over_e_prime_gt_9; max 9 (Reddy 2018 points score; not the continuous nomogram, not HFA-PEFF)",
  "max_score": 9,
  "score": 0,
  "bmi_kg_m2": 25.0
}

Client errors (HTTP 400)

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

Related tools

• ADHERE — Apply the Fonarow 2005 ADHERE classification and regression tree for in-hospital mortality risk in acutely decompensated heart failure from admission BUN, systolic blood pressure, and serum creatinine.

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.
• 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.