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

instrument / verified-clean

# Apgar Score Reference Sheet

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Inspectable records

[01**Overview**Purpose and lifecycle](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/qualification/>)

## Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

**Area**: Biology, Medicine & Pharmacology (educational estimates only — every panel labeled not-medical-advice)

**Tranche**: tranche-4

**Evidence ID**: t4-275

**Ledger rows**: 1

No ledger note is attached.

## Review findings

The stated formula is the standard Apgar total: sum of five components, each scored 0-2, producing a valid range of 0-10. No unit conversion is applicable.

### Formula and scope findings

No additional record

### Unit assumptions

- Each input is an integer Apgar rubric score from 0 through 2, not a raw measurement.

- Heart rate, respiration, muscle tone, reflex irritability, and color are scored according to the standard Apgar rubric before entry.

- The total is dimensionless and ranges from 0 to 10.

## Boundary hardening

**BREAK_CLAIMED** · SELF_FLAGGED

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.

## Errata and corrections

No applied erratum is attached to this unique-name record.

## Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

````
{
  "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"
}
````

## Related workflows

No source-defined multi-instrument workflow membership is recorded.

## Sources and evidence

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

- `VERIFIED_LEDGER.json · VERIFIED_CLEAN`

- `evidence-tranche4/tranche4-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`