Source: https://guthlabs.ai/docs/instruments/ideal-adjusted-body-weight/mechanism/

instrument mechanism / verified-clean

# Ideal/Adjusted Body Weight mechanism

The inspectable method record for Ideal/Adjusted Body Weight, kept separate from implementation and qualification.

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

## Model scope

The existing educational-reference and not-medical-advice label is appropriate, but IBW and AdjBW are method-dependent estimates and are not universally valid dosing weights. Drug-specific dosing rules, clinical judgment, and local protocols may use different formulas or correction factors.

- The Devine IBW formulas are standard when height is measured in total inches and body weight is in kilograms.

- The specification does not define behavior for height below 60 inches: it must state whether the formula is extrapolated using a negative inches-over-60 value or whether the excess is clamped at zero.

- The sex input is ambiguous: only Men and Women constants are provided, with no defined mapping for nonbinary, intersex, or unspecified inputs.

- The specification does not explicitly state that ActualBW must be in kilograms, so unit consistency is not guaranteed.

## Units and conventions

- Height must be total inches for direct use in the formula; if entered in centimeters, convert using inches = centimeters / 2.54.

- Actual body weight, IBW, and AdjBW are assumed to be in kilograms.

- The 60-inch reference is exactly 5 feet.

- The 0.4 adjustment factor is dimensionless.

- Devine constants 50 kg and 45.5 kg are applied to men and women, respectively.

## Inspectable vector

One of 4 source-bound review vectors:

````
{
  "inputs": {
    "sex": "man",
    "height": 60,
    "height_unit": "in",
    "actual_weight": 50,
    "weight_unit": "kg"
  },
  "expected_outputs": {
    "IBW_kg": 50,
    "AdjBW_kg": 50
  },
  "working": "Inches over 60 = 60 - 60 = 0. IBW = 50 + 2.3 × 0 = 50 kg. ActualBW - IBW = 50 - 50 = 0 kg. AdjBW = 50 + 0.4 × 0 = 50 kg."
}
````

## Failure boundary

**BREAK_CLAIMED** · SELF_FLAGGED

The extreme-magnitude vector produces Infinity and NaN through floating-point overflow and Infinity plus negative Infinity. The convention probe also exposes an input-validation hazard when height units are omitted or ambiguous.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/ideal-adjusted-body-weight/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/ideal-adjusted-body-weight/implementation/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/ideal-adjusted-body-weight/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-tranche3/tranche3-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`