# Cockcroft-Gault Creatinine Clearance Calculator > Cockcroft-Gault Creatinine Clearance Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15). Calculates creatinine clearance (CrCl) using the Cockcroft-Gault formula from age, sex, weight, and serum creatinine ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/crcl_cockcroft_gault - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-09-15 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/cockcroft-gault-creatinine-clearance-calculator-a3d1d864 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-SZ1VLv_0f-qFNS208x-Y Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability cockcroft-gault-creatinine-clearance-calculator-a3d1d864 ``` Example prompt: Calculate the Cockcroft-Gault creatinine clearance for a 68-year-old female weighing 72 kg with a serum creatinine of 1.4 mg/dL. ## When to prefer this Use this endpoint when a drug label or clinical guideline specifically references CrCl (Cockcroft-Gault) for dosing thresholds rather than CKD-EPI eGFR. Ideal for agents automating medication dosing checks, pharmacy prior-authorization workflows, or clinical decision support where a deterministic, citable formula is required. Prefer over CKD-EPI when the label explicitly calls for CrCl or when the patient's actual body weight is the appropriate weight basis. ## Known failure modes - Missing required fields (age or sex) returns a validation error - Age outside 18-120 range may be rejected or flagged - Providing neither weight_kg/weight_lb nor creatinine values returns an error - Implausibly extreme values (e.g. creatinine 0 or weight 0) may produce invalid results - Unit mismatch (e.g. entering µmol/L as mg/dL) produces a silently wrong result if wrong field used ## How this service works Cockcroft-Gault creatinine clearance from age, sex, total body weight, and creatinine. Use when a label still doses on CrCl rather than CKD-EPI eGFR. Deterministic published formula with citation; not a dosing recommendation. ## Output Returns the estimated creatinine clearance in mL/min computed via the Cockcroft-Gault formula, incorporating the 0.85 sex correction factor for females. Includes the citation for the published formula and a note that this is not a dosing recommendation. ## Request schema (JSON Schema) ```json { "type": "object", "$schema": "https://json-schema.org/draft/2020-12/schema", "required": [ "input" ], "properties": { "input": { "type": "object", "required": [ "type", "method" ], "properties": { "type": { "type": "string", "const": "http" }, "method": { "enum": [ "GET", "HEAD", "DELETE" ], "type": "string" }, "headers": { "type": "object", "additionalProperties": { "type": "string" } }, "queryParams": { "type": "object", "required": [ "age", "sex" ], "properties": { "age": { "type": "integer", "description": "Age in years (18-120)." }, "sex": { "enum": [ "female", "male" ], "type": "string", "description": "female applies the published 0.85 factor; male does not." }, "weight_kg": { "type": "number", "description": "Total body weight in kilograms. Provide weight_kg or weight_lb." }, "weight_lb": { "type": "number", "description": "Total body weight in pounds. Converted as kg = lb * 0.45359237." }, "creatinine_mg_dl": { "type": "number", "description": "Serum creatinine in mg/dL. Provide this or creatinine_umol_l." }, "creatinine_umol_l": { "type": "number", "description": "Serum creatinine in µmol/L. Converted as mg/dL = µmol/L / 88.42." } } } }, "additionalProperties": false }, "output": { "type": "object", "required": [ "type" ], "properties": { "type": { "type": "string" }, "example": { "type": "object" } } } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "path": "/api/calc/crcl_cockcroft_gault", "count": 2, "items": [ { "sex": "female", "units": "mL/min", "formula": "cockcroft_gault", "citation": { "id": "cockcroft-1976", "doi": "10.1159/000180580", "title": "Prediction of creatinine clearance from serum creatinine", "source": "Nephron. 1976;16(1):31-41", "authors": "Cockcroft DW, Gault MH" }, "age_years": 65, "weight_kg": 70, "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.", "crcl_ml_min": 56.3, "weight_basis": "total_body_weight", "creatinine_mg_dl": 1.1, "formula_expression": "CrCl_mL_min = ((140 - age) * weight_kg * (0.85 if female else 1)) / (72 * Scr_mg_dL)" }, { "sex": "female", "units": "mL/min", "formula": "cockcroft_gault", "citation": { "id": "cockcroft-1976", "doi": "10.1159/000180580", "title": "Prediction of creatinine clearance from serum creatinine", "source": "Nephron. 1976;16(1):31-41", "authors": "Cockcroft DW, Gault MH" }, "age_years": 65, "weight_kg": 70, "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.", "crcl_ml_min": 56.3, "weight_basis": "total_body_weight", "creatinine_mg_dl": 1.1, "formula_expression": "CrCl_mL_min = ((140 - age) * weight_kg * (0.85 if female else 1)) / (72 * Scr_mg_dL)" } ] } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cockcroft-gault-creatinine-clearance-calculator-a3d1d864/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from api.magentlab.com](https://www.zero.xyz/host/api.magentlab.com/llms.txt)