# Devine IBW

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/ibw_devine`
HTML: https://magentlab.com/docs/ibw
Markdown: https://magentlab.com/docs/ibw.md

Not a medical device. Not a diagnosis, dose, or listing recommendation.

## What it computes

Compute Devine ideal body weight and 0.4 adjusted body weight from height, sex, and actual weight.

## When to use

When a label or protocol still cites Devine IBW or 0.4 AdjBW and an agent must not invent the kilograms.

## When not to use

- Not a dosing recommendation. magent does not apply IBW to Cockcroft–Gault unless you call CrCl separately with that weight.
- Devine is undefined below 60 inches in the original table; this implementation still evaluates the linear formula.

## Formula

```
IBW_kg = 50 (male) or 45.5 (female) + 2.3 * (height_in - 60); AdjBW_kg = IBW_kg + 0.4 * (TBW_kg - IBW_kg) when TBW > IBW, else TBW_kg
```

## Citation

Gentamicin therapy
Devine BJ
Drug Intell Clin Pharm. 1974;8:650-655
DOI: none

## Worked example

### 70 in male, 90 kg

Given: `height_in=70, sex=male, weight_kg=90`

1. IBW = 50 + 2.3 * (70 - 60) = 73.0 kg
2. TBW 90 > IBW 73, so AdjBW = 73 + 0.4 * (90 - 73) = 79.8 kg


## Parameters

- `height_cm` (number, optional): Height in centimeters. Provide height_cm or height_in.
- `height_in` (number, optional): Height in inches. Devine uses inches: IBW adds 2.3 kg per inch over 60.
- `sex` (string, required): Sex used by Devine (50 kg male, 45.5 kg female base).
- `weight_kg` (number, optional): Actual total body weight in kilograms. Provide weight_kg or weight_lb.
- `weight_lb` (number, optional): Actual total body weight in pounds.

## Bulk (POST)

POST the same path with a JSON items array. Price is n times the GET unit. Invalid items return HTTP 400 before settlement.

Method: `POST /api/calc/ibw_devine`
Max items: 25
Price: unit_amount * n (unit 5000 atomic)
Status: PREVIEW

- 1 to 25 items. Each item uses the same keys as the GET query parameters.
- The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
- HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
- Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
- x402 resource URL is this path plus n and body_sha256. HTML paywall is GET only.

Example request:

```json
{
  "items": [
    {
      "height_in": "70",
      "sex": "male",
      "weight_kg": "90"
    },
    {
      "height_in": "70",
      "sex": "male",
      "weight_kg": "90"
    }
  ]
}
```

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/ibw_devine",
  "items": [
    {
      "disclaimer": "Not a medical device. Deterministic published-formula or coded-ontology output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Devine BJ",
        "doi": null,
        "id": "devine-1974",
        "source": "Drug Intell Clin Pharm. 1974;8:650-655",
        "title": "Gentamicin therapy"
      },
      "formula": "devine_ibw_adjbw",
      "formula_expression": "IBW_kg = 50 (male) or 45.5 (female) + 2.3 * (height_in - 60); AdjBW_kg = IBW_kg + 0.4 * (TBW_kg - IBW_kg) when TBW > IBW, else TBW_kg",
      "sex": "male",
      "height_cm": 177.8,
      "actual_weight_kg": 90.0,
      "adjbw_factor": 0.4,
      "adjbw_kg": 79.8,
      "height_in": 70.0,
      "ibw_kg": 73.0
    },
    {
      "disclaimer": "Not a medical device. Deterministic published-formula or coded-ontology output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Devine BJ",
        "doi": null,
        "id": "devine-1974",
        "source": "Drug Intell Clin Pharm. 1974;8:650-655",
        "title": "Gentamicin therapy"
      },
      "formula": "devine_ibw_adjbw",
      "formula_expression": "IBW_kg = 50 (male) or 45.5 (female) + 2.3 * (height_in - 60); AdjBW_kg = IBW_kg + 0.4 * (TBW_kg - IBW_kg) when TBW > IBW, else TBW_kg",
      "sex": "male",
      "height_cm": 177.8,
      "actual_weight_kg": 90.0,
      "adjbw_factor": 0.4,
      "adjbw_kg": 79.8,
      "height_in": 70.0,
      "ibw_kg": 73.0
    }
  ]
}
```

## Response fields

- `formula` (string): devine_ibw_adjbw
- `formula_expression` (string): Exact expressions used
- `sex` (string): female or male
- `height_cm` (number): Normalized height in cm
- `height_in` (number): Height in inches used by Devine
- `actual_weight_kg` (number): Total body weight in kg
- `ibw_kg` (number): Devine ideal body weight, 1 decimal
- `adjbw_kg` (number): Adjusted body weight with 0.4 factor when TBW > IBW, else TBW
- `adjbw_factor` (number): Always 0.4
- `citation` (object): Devine 1974 citation
- `disclaimer` (string): Not-a-device notice

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "disclaimer": "Not a medical device. Deterministic published-formula or coded-ontology output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Devine BJ",
    "doi": null,
    "id": "devine-1974",
    "source": "Drug Intell Clin Pharm. 1974;8:650-655",
    "title": "Gentamicin therapy"
  },
  "formula": "devine_ibw_adjbw",
  "formula_expression": "IBW_kg = 50 (male) or 45.5 (female) + 2.3 * (height_in - 60); AdjBW_kg = IBW_kg + 0.4 * (TBW_kg - IBW_kg) when TBW > IBW, else TBW_kg",
  "sex": "male",
  "height_cm": 177.8,
  "actual_weight_kg": 90.0,
  "adjbw_factor": 0.4,
  "adjbw_kg": 79.8,
  "height_in": 70.0,
  "ibw_kg": 73.0
}
```

## Errors

- HTTP 400 `invalid_height`: height_cm (50-250) or height_in (20-98) is required Returned before settlement; you are not charged.
- HTTP 400 `invalid_sex`: sex must be female or male Returned before settlement; you are not charged.
- HTTP 400 `invalid_weight`: weight_kg (1-500) or weight_lb (2-1100) is required Returned before settlement; you are not charged.
- HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
- HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
- HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged.
- HTTP 402 `payment_required`: Missing or invalid PAYMENT-SIGNATURE; decode the PAYMENT-REQUIRED header
- HTTP 409 `payment_in_progress`: The same authorization nonce is already being settled; retry shortly
- HTTP 429 `rate_limited`: Too many requests from this client
- HTTP 503 `settlement_uncertain`: Settlement is unconfirmed; retry with the same PAYMENT-SIGNATURE
- HTTP 503 `facilitator_unavailable`: Payment facilitator unavailable
- HTTP 503 `facilitator_misconfigured`: Payment facilitator is not configured
- HTTP 503 `facilitator_unauthorized`: Payment facilitator rejected credentials
- HTTP 503 `ledger_unavailable`: Payment ledger unavailable
- HTTP 503 `payment_unavailable`: Payment processing unavailable

## Related tools

- [BMI](https://magentlab.com/docs/bmi) — Compute Keys/Quetelet body-mass index from height and weight, plus a WHO adult band.
- [Mosteller BSA](https://magentlab.com/docs/bsa) — Compute Mosteller body surface area in m^2 from height and weight.
- [Cockcroft–Gault CrCl](https://magentlab.com/docs/crcl) — Compute Cockcroft–Gault creatinine clearance in mL/min using total body weight.

## Also searched as

- Devine IBW
- adjusted body weight 0.4
- ideal body weight
- AdjBW

## Payment

Required query parameters must be present and valid. Invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s.

## Guarantees

- Invalid query parameters return HTTP 400 before settlement. You are not charged.
- Settlement finishes before the tool executes. Uncertain settlement fails closed (HTTP 503).
- Execution is timeout-bounded and concurrency-capped.
- Calculator inputs are not persisted. Request logs store path without query.