Health

FEV₁/FVC Ratio (Obstructive vs Restrictive Pattern)

Compute FEV₁/FVC and classify obstructive (<70% GOLD) vs restrictive (normal ratio, reduced FVC) patterns, with the ATS/ERS LLN caveat. 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/fev1-fvc-ratio' \
  -H 'Content-Type: application/json' \
  -d '{"fev1":1.9,"fvc":3.8,"predictedFvc":0,"decimalPlaces":1}'

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/fev1-fvc-ratio

Parameters

Name	Type	Required	Description
fev1	number	Yes	Forced expiratory volume in 1 second, liters.
fvc	number	Yes	Forced vital capacity, liters.
predictedFvc	number	No	Predicted FVC in liters (e.g., from the vital-capacity-estimator tool); enables %FVC and restrictive-pattern assessment.
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-fev1-fvc-ratio": {
      "name": "fev1-fvc-ratio",
      "description": "Compute FEV₁/FVC and classify obstructive (<70% GOLD) vs restrictive (normal ratio, reduced FVC) patterns, with the ATS/ERS LLN caveat. Not medical advice.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=fev1-fvc-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": "fev1-fvc-ratio",
    "arguments": {
  "fev1": 1.9,
  "fvc": 3.8,
  "predictedFvc": 0,
  "decimalPlaces": 1
}
  }
}

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]

Browse tools Open tool

Name

Type

Required

Description

fev1

number

Yes

Forced expiratory volume in 1 second, liters.

fvc

number

Yes

Forced vital capacity, liters.

predictedFvc

number

Predicted FVC in liters (e.g., from the vital-capacity-estimator tool); enables %FVC and restrictive-pattern assessment.

decimalPlaces

number

—

{ "mcpServers": { "elysiatools-fev1-fvc-ratio": { "name": "fev1-fvc-ratio", "description": "Compute FEV₁/FVC and classify obstructive (<70% GOLD) vs restrictive (normal ratio, reduced FVC) patterns, with the ATS/ERS LLN caveat. Not medical advice.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=fev1-fvc-ratio", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "fev1-fvc-ratio", "arguments": { "fev1": 1.9, "fvc": 3.8, "predictedFvc": 0, "decimalPlaces": 1 } } }