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

instrument / verified-clean

# Water Intake / Hydration Estimator

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/water-intake-hydration-estimator/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/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-5

**Evidence ID**: t5-046

**Ledger rows**: 1

No ledger note is attached.

## Review findings

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.

### Formula and scope findings

- 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.

### Unit assumptions

- 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.

## Boundary hardening

**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.

## 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": {
    "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."
}
````

## 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-tranche5/tranche5-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`