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Schwartz 2009 Bedside eGFR Calculator (CKiD) for Children
x402
Schwartz 2009 Bedside eGFR Calculator (CKiD) for Children 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).
Calculates estimated GFR in children using the 2009 Schwartz bedside CKiD formula (0.413 × height_cm / creatinine_mg_dL), accepting height and creatinine in multiple units
Price / call$0.005
Success—
StatusUnknown
How this service works
Schwartz 2009 bedside eGFR for children with CKD (CKiD): 0.413 × height in cm divided by serum creatinine in mg/dL, rounded to one decimal as mL/min/1.73m2. Height may be centimeters or inches; creatinine may be mg/dL or µmol/L. Not a dosing recommendation, not CKD-EPI, not Cockcroft–Gault, and not the 1976 Schwartz k=0.55 formula. Does not assign CKD stages.
Output
Returns the estimated GFR value rounded to one decimal place in mL/min/1.73m², computed via the 2009 Schwartz bedside formula (0.413 × height_cm / creatinine_mg_dL). Does not include CKD staging, dosing recommendations, or adult eGFR formulas.
Example use cases
Pediatric CKD monitoring in clinic
“My patient is a 9-year-old with CKD who is 125 cm tall and has a serum creatinine of 0.9 mg/dL — what's their eGFR using the Schwartz 2009 bedside formula?”
Unit conversion from metric to eGFR
“Can you calculate the Schwartz bedside eGFR for a child who is 52 inches tall and has a creatinine of 71 µmol/L?”
EHR documentation for nephrology note
“I need to document an eGFR for a pediatric nephrology note — the child is 145 cm tall and creatinine is 1.1 mg/dL, use the 2009 Schwartz CKiD formula.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/schwartz_gfrWhen to prefer
Use this endpoint when you need the 2009 Schwartz bedside eGFR specifically for pediatric patients (children with CKD), as validated by the CKiD study. Prefer this over adult formulas like CKD-EPI or Cockcroft–Gault, which are inappropriate for children. Also prefer this over the original 1976 Schwartz formula (k=0.55) which overestimates GFR in modern creatinine assays. Use when input may be in mixed units (inches/cm, mg/dL/µmol/L) and automatic conversion is needed.
Side effects
- Missing required parameters (no height or no creatinine provided) — returns error
- Height or creatinine value out of acceptable range (e.g. height_cm < 50 or > 250, creatinine_mg_dL < 0.1 or > 20) — returns validation error
- Both height_cm and height_in provided simultaneously — ambiguous input may cause error
- Both creatinine_mg_dl and creatinine_umol_l provided simultaneously — ambiguous input
- Payment not included or insufficient — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/schwartz_gfr",
"count": 2,
"items": [
{
"units": "mL/min/1.73m2",
"formula": "schwartz_2009",
"citation": {
"id": "schwartz-2009",
"doi": "10.1681/ASN.2008030287",
"title": "New equations to estimate GFR in children with CKD",
"source": "J Am Soc Nephrol. 2009;20(3):629-637",
"authors": "Schwartz GJ, Muñoz A, Schneider MF, et al."
},
"height_cm": 140,
"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,
"egfr_ml_min_1_73m2": 57.8,
"formula_expression": "egfr_ml_min_1_73m2 = 0.413 * height_cm / creatinine_mg_dl"
},
{
"units": "mL/min/1.73m2",
"formula": "schwartz_2009",
"citation": {
"id": "schwartz-2009",
"doi": "10.1681/ASN.2008030287",
"title": "New equations to estimate GFR in children with CKD",
"source": "J Am Soc Nephrol. 2009;20(3):629-637",
"authors": "Schwartz GJ, Muñoz A, Schneider MF, et al."
},
"height_cm": 140,
"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,
"egfr_ml_min_1_73m2": 57.8,
"formula_expression": "egfr_ml_min_1_73m2 = 0.413 * height_cm / creatinine_mg_dl"
}
]
}
}Tags
x402
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