# ARDSNet Predicted Body Weight & Tidal Volume Calculator

> ARDSNet Predicted Body Weight & Tidal Volume Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Calculates ARDSNet 2000 predicted body weight (PBW) and lung-protective tidal volumes (6 mL/kg and 4 mL/kg) from patient height and sex

## Facts

- Endpoint: GET https://api.magentlab.com/api/calc/ardsnet_tv
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ardsnet-predicted-body-weight-tidal-volume-calculator-bdaa3217
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vo-v-t1-jOs7VB3KZID_6

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ardsnet-predicted-body-weight-tidal-volume-calculator-bdaa3217
```

Example prompt: Calculate the ARDSNet predicted body weight and lung-protective tidal volumes for a male patient who is 175 cm tall — I need the 6 mL/kg and 4 mL/kg targets.

## When to prefer this

Use this endpoint when you need a fast, deterministic, citation-backed ARDSNet PBW and tidal volume computation per the ARMA 2000 protocol. Prefer this over general LLM arithmetic to ensure correctness and auditability. Not appropriate for Devine IBW, pediatric patients, ETT sizing, plateau-pressure titration, or Berlin ARDS diagnosis — use dedicated endpoints for those.

## Known failure modes

- Missing required 'sex' parameter returns validation error
- Height out of range (below 50 cm or above 250 cm for height_cm, or below 20/above 98 for height_in) likely returns error
- Neither height_cm nor height_in provided results in missing input error
- Payment failure (402) if x402 micropayment header not included or insufficient funds

## How this service works

ARDS Network 2000 predicted body weight (PBW) from height and sex, and the lower-tidal-volume arm 6 mL/kg PBW. Male PBW_kg = 50 + 0.91*(height_cm-152.4); female uses 45.5. Also returns the published 4 mL/kg minimum. Height in cm or inches. Not a ventilator order, plateau-pressure titration, Berlin/AECC diagnosis, pediatric tube size, or ETT insertion depth. Not Devine IBW. Deterministic published arithmetic with citation.

## Output

Returns the ARDSNet predicted body weight in kilograms (using the published formula: 50 + 0.91*(height_cm - 152.4) for males, 45.5 + 0.91*(height_cm - 152.4) for females), the 6 mL/kg PBW tidal volume target from the ARMA trial, and the 4 mL/kg minimum tidal volume, with a citation to the source publication.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "sex"
     ],
     "properties": {
      "sex": {
       "enum": [
        "female",
        "male"
       ],
       "type": "string",
       "description": "Sex used by ARDSNet PBW (50 kg male, 45.5 kg female base)."
      },
      "height_cm": {
       "type": "number",
       "description": "Height in centimeters (50-250). Provide height_cm or height_in."
      },
      "height_in": {
       "type": "number",
       "description": "Height in inches (20-98). Converted as cm = in * 2.54."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ardsnet-predicted-body-weight-tidal-volume-calculator-bdaa3217/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.magentlab.com](https://www.zero.xyz/host/api.magentlab.com/llms.txt)