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GAP Index Calculator (Ley 2012)
x402
GAP Index Calculator (Ley 2012) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Computes the Ley 2012 GAP (Gender, Age, Physiology) index total score (0–8) and stage (1–3) for idiopathic pulmonary fibrosis prognosis
Price / call$0.005
Success—
StatusUnknown
How this service works
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Output
Returns the individual point contributions for sex, age, FVC, and DLCO, the total GAP score (0–8), and the corresponding GAP stage (Stage 1 for 0–3, Stage 2 for 4–5, Stage 3 for 6–8), with citation to Ley 2012.
Example use cases
IPF staging at clinic visit
“I need the GAP score and stage for a 72-year-old male with FVC 55% predicted and DLCO 38% predicted — he can perform the DLCO test.”
Prognosis for patient unable to perform DLCO
“Can you run the Ley 2012 GAP index for a 63-year-old female with FVC 71% predicted? She was unable to perform the DLCO test.”
Borderline age group scoring
“What is the GAP index and stage for a 61-year-old male with FVC 80% predicted and DLCO 58% predicted?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/gap_index?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a deterministic, citation-backed implementation of the Ley 2012 GAP index specifically — not a continuous or custom variant. It is ideal for clinical documentation, prior-authorization support, or EHR integration where a reproducible, auditable score is required. Prefer this over manual calculation whenever sex, age, FVC % predicted, and DLCO % predicted (or a cannot-perform flag) are available.
Side effects
- Missing required parameter (sex, age, or fvc_percent_predicted) returns a 400-level error
- Supplying both dlco_percent_predicted and dlco_cannot_perform=true simultaneously returns a validation error
- Age or FVC values outside allowed ranges (age 18–120, FVC 10–150) may be rejected
- DLCO value outside range 1–150 is rejected
- Network or service errors return a 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/gap_index",
"count": 2,
"items": [
{
"sex": "female",
"score": 0,
"formula": "gap_index",
"citation": {
"id": "ley-2012",
"doi": "10.7326/0003-4819-156-10-201205150-00004",
"pmid": "22586007",
"title": "A multidimensional index and staging system for idiopathic pulmonary fibrosis",
"source": "Ann Intern Med. 2012;156(10):684-691",
"authors": "Ley B, Ryerson CJ, Vittinghoff E, et al."
},
"age_years": 55,
"gap_stage": 1,
"max_score": 8,
"components": [
{
"value": "female",
"factor": "sex",
"points": 0,
"present": false
},
{
"value": 55,
"factor": "age",
"points": 0,
"present": false
},
{
"value": 80,
"factor": "fvc",
"points": 0,
"present": false
},
{
"value": 60,
"factor": "dlco",
"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.",
"formula_expression": "GAP = sex_points + age_points + fvc_points + dlco_points; female 0 male 1; age <=60 -> 0, 61-65 -> 1, >65 -> 2; FVC% >75 -> 0, 50-75 -> 1, <50 -> 2; DLCO% >55 -> 0, 36-55 -> 1, <=35 -> 2, cannot perform -> 3; stages I 0-3 / II 4-5 / III 6-8; max 8",
"dlco_cannot_perform": false,
"fvc_percent_predicted": 80,
"dlco_percent_predicted": 60
},
{
"sex": "female",
"score": 0,
"formula": "gap_index",
"citation": {
"id": "ley-2012",
"doi": "10.7326/0003-4819-156-10-201205150-00004",
"pmid": "22586007",
"title": "A multidimensional index and staging system for idiopathic pulmonary fibrosis",
"source": "Ann Intern Med. 2012;156(10):684-691",
"authors": "Ley B, Ryerson CJ, Vittinghoff E, et al."
},
"age_years": 55,
"gap_stage": 1,
"max_score": 8,
"components": [
{
"value": "female",
"factor": "sex",
"points": 0,
"present": false
},
{
"value": 55,
"factor": "age",
"points": 0,
"present": false
},
{
"value": 80,
"factor": "fvc",
"points": 0,
"present": false
},
{
"value": 60,
"factor": "dlco",
"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.",
"formula_expression": "GAP = sex_points + age_points + fvc_points + dlco_points; female 0 male 1; age <=60 -> 0, 61-65 -> 1, >65 -> 2; FVC% >75 -> 0, 50-75 -> 1, <50 -> 2; DLCO% >55 -> 0, 36-55 -> 1, <=35 -> 2, cannot perform -> 3; stages I 0-3 / II 4-5 / III 6-8; max 8",
"dlco_cannot_perform": false,
"fvc_percent_predicted": 80,
"dlco_percent_predicted": 60
}
]
}
}Tags
x402
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