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Magent RSBI Calculator
x402
Magent RSBI 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 Rapid Shallow Breathing Index (f/VT) from respiratory rate and tidal volume, and flags if the ratio exceeds the 105 breaths/min/L weaning threshold
Price / call$0.005
Success—
StatusUnknown
How this service works
Rapid shallow breathing index (RSBI) as respiratory rate in breaths/min divided by tidal volume in liters (Yang and Tobin 1991). Provide tidal_volume_ml (50–2000) or tidal_volume_l (0.05–2.0), not both. Returns f/VT rounded to one decimal and whether that ratio is greater than 105 breaths/min/L. Not a wean order; magent does not perform a spontaneous breathing trial (SBT).
Output
Returns the RSBI (f/VT) value rounded to one decimal place in breaths/min/L, along with a boolean or flag indicating whether the ratio exceeds 105 breaths/min/L — the Yang and Tobin 1991 threshold above which extubation failure risk is elevated. Does not perform or order a spontaneous breathing trial.
Example use cases
ICU ventilator weaning screen
“My ICU patient is on the ventilator with a respiratory rate of 32 breaths per minute and a tidal volume of 310 mL — can you calculate their RSBI and tell me if it's above the 105 threshold?”
Respiratory therapy documentation
“I need the RSBI for charting: the patient's RR is 24 breaths per minute and tidal volume is 0.45 liters. What's the f/VT ratio?”
Clinical decision support integration
“Run an RSBI calculation for a patient at 18 breaths per minute and 500 mL tidal volume so I can decide whether to proceed with a spontaneous breathing trial.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/rsbiWhen to prefer
Use this endpoint when you need a fast, authoritative RSBI calculation grounded in Yang and Tobin 1991 methodology with built-in unit conversion (mL or L) and an explicit flag for the clinical 105 threshold. Prefer it over manual calculation in agentic workflows where auditability and standardized rounding matter, or when integrating RSBI into a broader ventilator-weaning decision pipeline alongside other magentlab clinical calculators (e.g. FENa, CRB-65).
Side effects
- Missing respiratory_rate parameter — required field, returns validation error
- Both tidal_volume_ml and tidal_volume_l provided simultaneously — only one is accepted, returns error
- Tidal volume out of range (below 50 mL / 0.05 L or above 2000 mL / 2.0 L) — returns validation error
- Respiratory rate out of integer range (below 4 or above 80) — returns validation error
- Payment failure via x402 protocol — call is rejected without result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/rsbi",
"count": 2,
"items": [
{
"rsbi": 50,
"formula": "rsbi",
"citation": {
"id": "yang-tobin-1991",
"doi": "10.1056/NEJM199105233242101",
"title": "A prospective study of indexes predicting the outcome of trials of weaning from mechanical ventilation",
"source": "N Engl J Med. 1991;324(21):1445-1450",
"authors": "Yang KL, Tobin MJ"
},
"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.",
"rsbi_gt_105": false,
"tidal_volume_l": 0.4,
"respiratory_rate": 20,
"formula_expression": "rsbi = respiratory_rate / tidal_volume_l"
},
{
"rsbi": 50,
"formula": "rsbi",
"citation": {
"id": "yang-tobin-1991",
"doi": "10.1056/NEJM199105233242101",
"title": "A prospective study of indexes predicting the outcome of trials of weaning from mechanical ventilation",
"source": "N Engl J Med. 1991;324(21):1445-1450",
"authors": "Yang KL, Tobin MJ"
},
"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.",
"rsbi_gt_105": false,
"tidal_volume_l": 0.4,
"respiratory_rate": 20,
"formula_expression": "rsbi = respiratory_rate / tidal_volume_l"
}
]
}
}Tags
x402
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