Creatinine Clearance (Cockcroft-Gault) implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-002

Effect

Computation or source lookup only

Input and validation requirements

A serum creatinine input of exactly zero produces division by zero, so the instrument must reject the input or return an explicit undefined result rather than a numeric clearance.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "age_years": 50,
    "weight_kg": 70,
    "sex": "male",
    "serum_creatinine_mg_dL": 1
  },
  "expected_outputs": {
    "creatinine_clearance_mL_min": 87.5
  },
  "working": "140 − 50 = 90; 90 × 70 = 6300; female factor = 1.00; denominator = 72 × 1.0 = 72; CrCl = 6300 ÷ 72 = 87.5 mL/min."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json