Health

Respiratory Exchange Ratio (RER = V̇CO₂/V̇O₂)

Calculate RER = V̇CO₂/V̇O₂ from measured gas exchange. Resting interpretation: 0.70 fat, 0.80 mixed diet, 1.00 carbohydrate; exercise interpretation: RER ≥ 1.10 supports maximal effort. Not medical advice.

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/respiratory-exchange-ratio' \
  -H 'Content-Type: application/json' \
  -d '{"vco2":200,"vo2":250,"context":"rest","decimalPlaces":2}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/respiratory-exchange-ratio

Parameters

Name	Type	Required	Description
vco2	number	Yes	Carbon dioxide production (mL/min, STPD) from indirect calorimetry.
vo2	number	Yes	Oxygen uptake (mL/min, STPD) from indirect calorimetry.
context	select	No	Whether the gas volumes were collected at rest or during an exercise test.
decimalPlaces	number	No	—

Response format

JSON result

JSON

{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-respiratory-exchange-ratio": {
      "name": "respiratory-exchange-ratio",
      "description": "Calculate RER = V̇CO₂/V̇O₂ from measured gas exchange. Resting interpretation: 0.70 fat, 0.80 mixed diet, 1.00 carbohydrate; exercise interpretation: RER ≥ 1.10 supports maximal effort. Not medical advice.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=respiratory-exchange-ratio",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "respiratory-exchange-ratio",
    "arguments": {
  "vco2": 200,
  "vo2": 250,
  "context": "rest",
  "decimalPlaces": 2
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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Name

Type

Required

Description

vco2

number

Yes

Carbon dioxide production (mL/min, STPD) from indirect calorimetry.

vo2

number

Yes

Oxygen uptake (mL/min, STPD) from indirect calorimetry.

context

select

Whether the gas volumes were collected at rest or during an exercise test.

decimalPlaces

number

—

{ "mcpServers": { "elysiatools-respiratory-exchange-ratio": { "name": "respiratory-exchange-ratio", "description": "Calculate RER = V̇CO₂/V̇O₂ from measured gas exchange. Resting interpretation: 0.70 fat, 0.80 mixed diet, 1.00 carbohydrate; exercise interpretation: RER ≥ 1.10 supports maximal effort. Not medical advice.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=respiratory-exchange-ratio", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "respiratory-exchange-ratio", "arguments": { "vco2": 200, "vo2": 250, "context": "rest", "decimalPlaces": 2 } } }