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

instrument mechanism / verified-clean

# Apgar Score Reference Sheet mechanism

The inspectable method record for Apgar Score Reference Sheet, kept separate from implementation and qualification.

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

## Model scope

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.

No additional formula finding is recorded.

## Units and conventions

- 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.

## Inspectable vector

One of 4 source-bound review vectors:

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

## Failure boundary

**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.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/apgar-score-reference-sheet/implementation/>)[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`

- `BOUNDARY_HAZARD_CATALOG.json`