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Steinhart 2009 Acute Heart Failure Probability Calculator
x402
Steinhart 2009 Acute Heart Failure Probability Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Calculates the probability of acute heart failure using the Steinhart 2009 Equation 1 logistic model from age, clinician pretest probability, and NT-proBNP level, with rule-out and rule-in flags.
Price / call$0.005
Success—
StatusUnknown
How this service works
Steinhart 2009 Equation 1 probability of acute heart failure from caller-assigned age, clinician pretest probability (fraction 0-1 or 0-100 percent), and NT-proBNP in pg/mL. Returns estimated_probability_percent from the unrounded probability plus published ≤0.20 rule-out and ≥0.80 rule-in flags. Not a diagnosis, diuretic, or admission order. magent does not assay NT-proBNP.
Output
Returns an estimated_probability_percent representing the unrounded Steinhart 2009 Equation 1 logistic model output, plus boolean flags indicating whether the probability meets the published ≤0.20 rule-out or ≥0.80 rule-in thresholds for acute heart failure. Does not provide a diagnosis or clinical order.
Example use cases
Emergency ED triage for dyspnea
“I have a 68-year-old presenting with shortness of breath in the ED — pretest probability of heart failure is about 0.6 and the NT-proBNP is 5800 pg/mL. Can you run the Steinhart 2009 equation to estimate the acute heart failure probability and tell me if it hits the rule-in threshold?”
Low-risk rule-out in urgent care
“A 55-year-old came in with mild dyspnea, my pretest probability for heart failure is 0.15, and their NT-proBNP is 180 pg/mL. Run the Steinhart 2009 model and let me know if we can rule out acute heart failure.”
Borderline NT-proBNP clinical decision support
“Patient is 80 years old, NT-proBNP is 1100 pg/mL, and my pretest probability is 0.50. What does the Steinhart 2009 equation give for acute heart failure probability, and does it trigger any rule-in or rule-out flag?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/steinhartWhen to prefer
Use this endpoint when you need a validated, published logistic model (Steinhart 2009 Equation 1) specifically for acute heart failure probability combining NT-proBNP, clinician pretest probability, and age. Prefer this over generic biomarker lookup tools when you need an interpreted probability with rule-in/rule-out decision thresholds. Not appropriate for chronic heart failure risk scoring (see MAGGIC) or ACS probability (see T-MACS).
Side effects
- Missing required parameters (age, pretest_probability, or nt_probnp_pg_ml) returns a validation error
- Age outside 18-100 range may be rejected or produce out-of-validation-range results
- NT-proBNP outside 5-35000 pg/mL range may produce unreliable results
- Pretest probability provided in percent (e.g. 45) is auto-divided by 100; misuse of scale can yield unexpected results
- NT-proBNP provided in pmol/L instead of pg/mL will silently produce incorrect probabilities since no unit conversion is performed
- Payment failure via x402 protocol returns 402 status with no computation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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