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CKD-EPI 2021 Race-Free eGFR Calculator
x402
CKD-EPI 2021 Race-Free eGFR Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Computes estimated glomerular filtration rate (eGFR) using the race-free CKD-EPI 2021 creatinine equation from age, sex, and serum creatinine
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 a deterministic eGFR value in mL/min/1.73m² computed from the published CKD-EPI 2021 race-free creatinine equation, along with the corresponding CKD stage or kidney function category and a citation to the source formula.
Example use cases
Pre-medication renal dosing check
“My patient is a 72-year-old female with a creatinine of 1.6 mg/dL — what is her eGFR so I can confirm whether metformin is safe to prescribe?”
CKD staging for prior authorization
“I need to stage kidney disease for a 45-year-old male with a serum creatinine of 2.3 mg/dL — can you run the CKD-EPI 2021 calculation and tell me what CKD stage that corresponds to?”
Convert µmol/L creatinine to eGFR
“A lab report shows creatinine of 142 µmol/L for a 63-year-old female — use the race-free CKD-EPI 2021 equation to get her eGFR.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/egfr_ckd_epi?utm_source=zero.xyzWhen to prefer
Use this endpoint whenever an AI agent must not rely on a language model's internal approximation of kidney function — this endpoint applies the exact, deterministic published CKD-EPI 2021 race-free creatinine formula with a citation, making it appropriate for clinical decision support, prior authorization workflows, drug dosing checks, and any context requiring auditable, reproducible eGFR estimates without racial adjustment.
Side effects
- Missing required parameters (age or sex) returns a validation error
- Age outside 18–120 range may return an out-of-range error as CKD-EPI 2021 is validated only in adults
- Neither creatinine_mg_dl nor creatinine_umol_l provided returns an error requiring at least one
- Negative or physiologically implausible creatinine values may be rejected
- Payment not included or insufficient USDC results in HTTP 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/egfr_ckd_epi",
"count": 2,
"items": [
{
"sex": "female",
"units": "mL/min/1.73m2",
"formula": "ckd_epi_2021_creatinine",
"citation": {
"id": "inker-2021",
"doi": "10.1056/NEJMoa2102953",
"title": "New Creatinine- and Cystatin C-Based Equations to Estimate GFR without Race",
"source": "N Engl J Med. 2021;385(19):1737-1749",
"authors": "Inker LA, Eneanya ND, Coresh J, et al."
},
"age_years": 65,
"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.",
"creatinine_mg_dl": 1.1,
"egfr_ml_min_1_73m2": 55.8,
"formula_expression": "142 * min(Scr/κ,1)^α * max(Scr/κ,1)^(-1.200) * 0.9938^age * (1.012 if female)"
},
{
"sex": "female",
"units": "mL/min/1.73m2",
"formula": "ckd_epi_2021_creatinine",
"citation": {
"id": "inker-2021",
"doi": "10.1056/NEJMoa2102953",
"title": "New Creatinine- and Cystatin C-Based Equations to Estimate GFR without Race",
"source": "N Engl J Med. 2021;385(19):1737-1749",
"authors": "Inker LA, Eneanya ND, Coresh J, et al."
},
"age_years": 65,
"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.",
"creatinine_mg_dl": 1.1,
"egfr_ml_min_1_73m2": 55.8,
"formula_expression": "142 * min(Scr/κ,1)^α * max(Scr/κ,1)^(-1.200) * 0.9938^age * (1.012 if female)"
}
]
}
}Tags
x402
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