Corrected Calcium / Sodium Calculator 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

t5-002

Effect

Computation or source lookup only

Input and validation requirements

An extreme glucose input near the JavaScript floating-point limit causes the subtraction of 100 to be lost and the final result to lose low-order precision. The instrument specification also provides no input-range validation for zero or extreme values.

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": {
    "calcium_mg_dL": 8.2,
    "albumin_g_dL": 3,
    "sodium_mEq_L": 140,
    "glucose_mg_dL": 200
  },
  "expected_outputs": {
    "corrected_calcium_mg_dL": 9,
    "corrected_sodium_mEq_L": 142.4
  },
  "working": "Corrected calcium: 8.2 + 0.8 × (4 − 3.0) = 8.2 + 0.8 × 1.0 = 8.2 + 0.8 = 9.0 mg/dL. Corrected sodium: 140 + 2.4 × ((200 − 100) / 100) = 140 + 2.4 × (100 / 100) = 140 + 2.4 × 1 = 142.4 mEq/L."
}

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-tranche5/tranche5-results.json