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CKiD U25 eGFR Calculator (Pierce 2021)
x402
CKiD U25 eGFR Calculator (Pierce 2021) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Calculates estimated GFR for patients aged 1–25 using the Pierce 2021 CKiD U25 formula with creatinine, cystatin C, or both markers
Price / call$0.005
Success—
StatusUnknown
How this service works
CKiD U25 eGFR (Pierce 2021) for ages 1-25: age- and sex-dependent K times height in meters over creatinine (mg/dL), or K over cystatin C (mg/L), or the average of both when both markers are given. Height may be cm or inches; creatinine may be mg/dL or µmol/L. Not the Schwartz 2009 bedside 0.413 formula, not a drug dose, and not a CKD stage. Not a medical device.
Output
Returns a numeric eGFR estimate (mL/min/1.73m²) computed via the Pierce 2021 CKiD U25 age- and sex-dependent K formula. When both creatinine and cystatin C are provided, returns the average of both eGFR paths. Indicates which calculation path was used (creatinine-based, cystatin C-based, or combined).
Example use cases
Pediatric CKD workup with dual markers
“My patient is a 9-year-old female, 130 cm tall, with a creatinine of 0.6 mg/dL and cystatin C of 1.1 mg/L — can you run the Pierce 2021 CKiD U25 eGFR using both markers?”
Adolescent cystatin-C-only eGFR
“Calculate the CKiD U25 eGFR for a 17-year-old male using only his cystatin C result of 1.4 mg/L — we don't have a reliable creatinine for him.”
Young adult creatinine-based renal estimate
“What is the Pierce 2021 CKiD U25 eGFR for a 22-year-old female who is 63 inches tall and has a serum creatinine of 1.2 mg/dL?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/ckid_u25When to prefer
Use this endpoint when you need the Pierce 2021 CKiD U25 eGFR specifically for patients aged 1–25, as opposed to the adult Schwartz bedside 0.413 formula or adult CKD-EPI equations. It is particularly appropriate when the patient age falls outside the adult range or when you have cystatin C available for a more accurate combined estimate. Do not use for CKD staging, drug dosing decisions, or patients over 25.
Side effects
- Age outside the 1–25 year range returns a validation error
- Missing required paired inputs (e.g., creatinine without height) returns an error
- Creatinine or cystatin C values outside plausible ranges (e.g., creatinine > 20 mg/dL) may be rejected
- Invalid sex enum value returns a schema error
- Providing neither creatinine nor cystatin C returns an error — at least one marker is required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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