Source: https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/mechanism/

instrument mechanism / verified-clean

# Water Intake / Hydration Estimator mechanism

The inspectable method record for Water Intake / Hydration Estimator, kept separate from implementation and qualification.

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

## Model scope

The base arithmetic is correct under the stated unit assumptions, but the instrument cannot be verified as a complete estimator until activity-level mappings, climate mappings, allowed input ranges, and adjustment units are explicitly defined.

- The base term 35 mL/kg/day is a commonly used rough guideline, but it is not a universally standard clinical formula for every person or situation.

- The activity adjustment is undefined: no mapping from activity level to an adjustment amount is provided, and its units are not specified.

- Climate is listed as an input but has no formula, lookup table, or stated effect on the result.

- The specification does not define whether the adjustment is added in mL/day, mL/kg/day, or another unit, so the computation is not fully implementable as written.

## Units and conventions

- Weight is assumed to be entered in kilograms.

- The coefficient 35 has units of mL/kg/day.

- For these test vectors only, activity_adjustment_ml is assumed to be a directly supplied total adjustment in mL/day.

- The final conversion is suggested_daily_intake_L = total_mL / 1000.

- Climate is shown as an input but assumed to have no effect in these arithmetic examples because no climate adjustment is specified.

## Inspectable vector

One of 4 source-bound review vectors:

````
{
  "inputs": {
    "weight_kg": 50,
    "activity_adjustment_ml": 0,
    "climate": "temperate"
  },
  "expected_outputs": {
    "suggested_daily_intake_L": 1.75
  },
  "working": "Base intake = 35 mL/kg/day × 50 kg = 1750 mL/day. Activity adjustment = 0 mL/day. Total = 1750 + 0 = 1750 mL/day. Convert to liters: 1750 ÷ 1000 = 1.75 L/day."
}
````

## Failure boundary

**BREAK_CLAIMED** · SELF_FLAGGED

The specification does not define activity adjustments, climate effects, or a branch rule, and it permits arithmetic inputs that can yield nonphysical zero values or JavaScript Infinity at extreme magnitudes. Unit ambiguity can also change the result substantially.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/implementation/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/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-tranche5/tranche5-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`