Source: https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/implementation/

instrument implementation / implementation-contract

# Apgar Score Reference Sheet implementation

A source-bound implementation contract for Apgar Score Reference Sheet; 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**: t4-275

**Effect**: Computation or source lookup only

## Input and validation requirements

The extreme-magnitude vector exposes a likely robustness hazard: without strict 0-2 validation, plain JavaScript arithmetic produces Infinity rather than a bounded 0-10 result. The branch and convention probes also show that invalid component values and clinically interpreted color descriptions require explicit validation and rubric labeling.

## 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": {
    "heart_rate": 0,
    "respiration": 0,
    "muscle_tone": 0,
    "reflex": 0,
    "color": 0
  },
  "expected_outputs": {
    "total_apgar_score": 0
  },
  "working": "0 + 0 + 0 + 0 + 0 = 0"
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/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-tranche4/tranche4-results.json`