Source: https://guthlabs.ai/docs/instruments/homa-ir-insulin-resistance-index-education/implementation/

instrument implementation / implementation-contract

# HOMA-IR Insulin Resistance Index (education) implementation

A source-bound implementation contract for HOMA-IR Insulin Resistance Index (education); deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t5-088

**Effect**: Computation or source lookup only

## Input and validation requirements

Finite JavaScript inputs of 1e308 for both variables overflow during multiplication and produce Infinity rather than a finite HOMA-IR value. The specification also provides no stated validation for physiologically impossible zero or negative measurements and no unit-conversion guard beyond naming mg/dL.

## 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": {
    "fasting_glucose_mg_dL": 90,
    "fasting_insulin_uU_mL": 10
  },
  "expected_outputs": {
    "homa_ir": 2.2222222222
  },
  "working": "HOMA-IR = (90 × 10) / 405\n= 900 / 405\n= 20 / 9\n= 2.2222222222"
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/homa-ir-insulin-resistance-index-education/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/homa-ir-insulin-resistance-index-education/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/homa-ir-insulin-resistance-index-education/qualification/>)

## 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`