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APACHE II Score Calculator
x402
APACHE II Score 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).
Computes the integer APACHE II score (0–71) from 12 acute physiology parameters, age, and chronic-health points using the Knaus 1985 methodology
Price / call$0.005
Success—
StatusUnknown
How this service works
Knaus 1985 APACHE II integer: 12 Acute Physiology Score items (worst in 24 hours as assigned by the caller) plus age and chronic-health points, max 71. Oxygenation uses A-aDO2 when FiO2 is at least 0.5 and PaO2 when FiO2 is below 0.5. Creatinine points double in acute renal failure. Does not compute predicted death risk. magent does not measure vitals.
Output
Returns an integer APACHE II total score (0–71) derived from the sum of the Acute Physiology Score (12 worst-24-hour physiologic variable points), age points, and chronic health points. Oxygenation is scored via A-aDO2 when FiO2 ≥ 0.5 and via PaO2 when FiO2 < 0.5. Creatinine points are doubled when acute renal failure is flagged. Does not include predicted mortality risk percentage.
Example use cases
ICU admission severity triage
“I need the APACHE II score for a newly admitted ICU patient: temp 39.0°C, MAP 72 mmHg, HR 130, RR 28, FiO2 0.6 with an A-aDO2 of 310 mmHg, arterial pH 7.28, sodium 145, potassium 5.2, creatinine 1.8 mg/dL, hematocrit 38%, WBC 18 k/µL, GCS 10, age 58, no chronic health points, not elective postop, no acute renal failure.”
Renal failure patient scoring
“Compute the APACHE II score for a septic patient with acute renal failure: temp 37.8°C, MAP 55 mmHg, HR 95, RR 18, FiO2 0.35 with PaO2 62 mmHg, pH 7.35, sodium 136, potassium 4.8, creatinine 3.5 mg/dL, hematocrit 29%, WBC 22 k/µL, GCS 15, age 72, chronic health points 5, not elective postop, acute renal failure present.”
Post-surgical ICU severity assessment
“What's the APACHE II score for my elective postop patient in the ICU? Temp 37.0°C, MAP 88 mmHg, HR 78, RR 14, FiO2 0.5 with A-aDO2 of 180 mmHg, pH 7.42, sodium 140, potassium 3.9, creatinine 1.0 mg/dL, hematocrit 36%, WBC 10 k/µL, GCS 15, age 55, chronic health points 0, elective postop yes, no acute renal failure.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/apache_iiWhen to prefer
Use this endpoint when you need a programmatic, deterministic APACHE II integer score computation conforming to the original Knaus 1985 methodology, including correct oxygenation switching (A-aDO2 vs PaO2 based on FiO2 threshold) and acute renal failure creatinine doubling. Prefer this over general-purpose LLM arithmetic when audit-grade reproducibility of ICU severity scoring is required. Do not use if you need predicted mortality probability — this endpoint returns only the integer score.
Side effects
- Missing required query parameters returns an error — all 16 required fields must be supplied
- Out-of-range values (e.g. age < 16, GCS outside 3–15, FiO2 outside 0.21–1.00) may return a validation error
- Providing aa_gradient when FiO2 < 0.5 or pao2_mm_hg when FiO2 ≥ 0.5 — the unused gas parameter is silently ignored but the required one must be present
- Payment failure (x402) if USDC balance is insufficient or x402 headers are not correctly configured
- Network timeout if the API is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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