CKiD U25 eGFR (Pierce 2021) for ages 1-25
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.
Asked 1.4x its listed price for its own exampleour last check, 2026-09-28
1 of 1checks answered this week
284 msmedian answer time
$0.005listed price per call
$0.007price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.magentlab.com/api/calc/ckid_u25
| Category | Everything else |
|---|---|
| Provider host | api.magentlab.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.007 | 284 ms |
Example input (from the provider)
{
"body": {
"items": [
{
"age_years": 10,
"creatinine_mg_dl": 1,
"creatinine_umol_l": 88.42,
"cystatin_c_mg_l": 1,
"height_cm": 140,
"height_in": 55.1181,
"sex": "male"
},
{
"age_years": 10,
"creatinine_mg_dl": 1,
"creatinine_umol_l": 88.42,
"cystatin_c_mg_l": 1,
"height_cm": 140,
"height_in": 55.1181,
"sex": "male"
}
]
},
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"items": {
"items": {
"properties": {
"age_years": {
"description": "Age in years (1-25, fractional ages allowed). Pierce 2021 CKiD U25 age-dependent K is evaluated at that age. Not the adult 18-120 clamp.",
"type": "number"
},
"creatinine_mg_dl": {
"description": "Serum creatinine in mg/dL (0.1-20). Required with height for the creatinine or combined path. Provide this or creatinine_umol_l.",
"type": "number"
},
"creatinine_umol_l": {
"description": "Serum creatinine in \u00b5mol/L (9-1768). Converted as mg/dL = \u00b5mol/L / 88.42.",
"type": "number"
},
"cystatin_c_mg_l": {
"description": "Serum cystatin C in mg/L (0.2-10). Required for the cystatin-only or combined path. Height is not required when this is the only marker.",
"type": "number"
},
"height_cm": {
"description": "Height in centimeters (50-250). Required with creatinine for the creatinine or combined path. Converted to meters in the equation. Provide height_cm or height_in. Not required for cystatin-only.",
"type": "number"
},
"height_in": {
"description": "Height in inches (20-98). Converted as cm = in * 2.54.",
"type": "number"
},
"sex": {
"description": "Sex used by Pierce 2021 Table 2 K. female or male.",
"enum": [
"female",
"male"
],
"type": "string"
}
},
"required": [
"age_years",
"sex"
],
"type": "object"
},
"maxItems": 25,
"minItems": 1,
"type": "array"
}
},
"required": [
"items"
],
"type": "object"
},
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"const": "POST",
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}