Source: https://guthlabs.ai/docs/instruments/glycemic-load-calculator/

instrument / verified-clean

# Glycemic Load Calculator

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/glycemic-load-calculator/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/glycemic-load-calculator/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/glycemic-load-calculator/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/glycemic-load-calculator/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-7

**Evidence ID**: t7-079

**Ledger rows**: 1

No ledger note is attached.

## Review findings

The core arithmetic is correct, and the existing educational-not-medical-advice label is appropriate. Release requires explicit category thresholds, a definition of carbohydrate grams as available/digestible carbohydrate, a stated GI reference convention, and handling for missing or undefined GI values.

### Formula and scope findings

- GL=(GI×carb_g)/100 is the standard glycemic-load formula when GI is the food's GI relative to the glucose reference scale (glucose=100) and carb_g means grams of available/digestible carbohydrate in the stated portion.

- The category thresholds are not specified. A common convention is low ≤10, medium 11–19, and high ≥20, but the instrument must explicitly publish its chosen boundary rules.

- The carbohydrate input is ambiguous: total carbohydrate versus available carbohydrate (total carbohydrate minus fiber and sometimes sugar alcohols). Standard GL calculations generally use available/digestible carbohydrate.

- GI is highly dependent on food variety, preparation, ripeness, processing, and test protocol; a lookup value must identify the food form and source convention.

### Unit assumptions

- GI is dimensionless and uses the glucose-reference scale, with glucose assigned GI=100.

- carb_g is grams of available/digestible carbohydrate in exactly the portion being evaluated, not grams per 100 g unless the portion is 100 g.

- The worked category outputs assume the conventional thresholds low ≤10, medium 11–19, and high ≥20.

- GI should normally be constrained to 0–100; carbohydrate grams should be nonnegative.

## Boundary hardening

**BREAK_CLAIMED** · SELF_FLAGGED

The extreme-magnitude vector causes mathematical overflow in ordinary floating-point arithmetic, yielding Infinity or a non-finite result unless inputs are rejected or arbitrary-precision arithmetic is used. Category thresholds are also unspecified, and unit ambiguity can change the result substantially.

## 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": {
    "food": "glucose solution",
    "glycemic_index": 100,
    "carbohydrate_g": 25,
    "portion_description": "portion containing 25 g available carbohydrate"
  },
  "expected_outputs": {
    "glycemic_load": 25,
    "category": "high"
  },
  "reference_data": {
    "food": "glucose",
    "glycemic_index": 100,
    "source_convention": "International GI reference convention; glucose reference assigned GI=100 (widely tabulated standard value)"
  },
  "working": "GL=(GI×carb_g)/100=(100×25)/100=2500/100=25. Using low ≤10, medium 11–19, high ≥20: 25 is high."
}
````

## 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-tranche7/tranche7-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`