Health

Base Excess Calculator (Metabolic Component)

Calculate base excess (BE) using the Siggaard-Andersen formula. BE < −3 metabolic acidosis, > +3 metabolic alkalosis. HCO₃⁻ auto-calculated from pH + PaCO₂ if omitted. Derived from Siggaard-Andersen 1974, Cornell PICU, Medscape, and Langer 2022. 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/base-excess-calculator' \
  -H 'Content-Type: application/json' \
  -d '{"ph":7.2,"paco2":25,"hco3":10,"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/base-excess-calculator

Parameters

Name	Type	Required	Description
ph	number	Yes	Arterial blood pH.
paco2	number	Yes	Arterial CO₂ partial pressure (mmHg).
hco3	number	No	Measured bicarbonate (mmol/L). If omitted, calculated from Henderson-Hasselbalch.
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-base-excess-calculator": {
      "name": "base-excess-calculator",
      "description": "Calculate base excess (BE) using the Siggaard-Andersen formula. BE < −3 metabolic acidosis, > +3 metabolic alkalosis. HCO₃⁻ auto-calculated from pH + PaCO₂ if omitted. Derived from Siggaard-Andersen 1974, Cornell PICU, Medscape, and Langer 2022. Not medical advice.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=base-excess-calculator",
      "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": "base-excess-calculator",
    "arguments": {
  "ph": 7.2,
  "paco2": 25,
  "hco3": 10,
  "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]

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Base Excess Calculator (Metabolic Component)

json· JSON resultOpen tool

Name

Type

Required

Description

number

Yes

Arterial blood pH.

paco2

number

Yes

Arterial CO₂ partial pressure (mmHg).

hco3

number

Measured bicarbonate (mmol/L). If omitted, calculated from Henderson-Hasselbalch.

decimalPlaces

number

—

{ "mcpServers": { "elysiatools-base-excess-calculator": { "name": "base-excess-calculator", "description": "Calculate base excess (BE) using the Siggaard-Andersen formula. BE < −3 metabolic acidosis, > +3 metabolic alkalosis. HCO₃⁻ auto-calculated from pH + PaCO₂ if omitted. Derived from Siggaard-Andersen 1974, Cornell PICU, Medscape, and Langer 2022. Not medical advice.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=base-excess-calculator", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "base-excess-calculator", "arguments": { "ph": 7.2, "paco2": 25, "hco3": 10, "decimalPlaces": 1 } } }