ForHosting KIT · Developer Utilities

SAPS II calculator

The Simplified Acute Physiology Score II, published by Le Gall, Lemeshow, and Saulnier in 1993, converts age, admission type, chronic disease, and twelve admission physiological measurements into an integer ICU severity score and a predicted hospital mortality probability.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

This calculator applies the original JAMA point tables and the logistic equation logit equals negative 7.7631 plus 0.0737 times the score plus 0.9971 times the natural log of score plus one, then maps that logit to a probability with the standard expit. Every physiological value must be a finite number; a missing, infinite, or non-numeric vital or laboratory result fails with invalid_input and is not billed. The same deterministic module powers the free browser widget and the API, so teaching vignettes, research coding, and product prototypes never disagree on a given row. Treat the JSON as transparent arithmetic, not a diagnosis or a substitute for licensed clinical judgment.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

What is the SAPS II score?

It is Le Gall’s 1993 Simplified Acute Physiology Score II for adult ICU patients. This tool returns the integer point total, the original logistic logit, and the predicted hospital mortality probability and percent.

How is predicted hospital mortality calculated from the score?

logit = −7.7631 + 0.0737 × SAPS II + 0.9971 × ln(SAPS II + 1). Probability is e^logit / (1 + e^logit). Those coefficients are from the original JAMA paper, not a later customisation.

What happens if a physiological value is missing, infinite, or not a number?

The call fails with invalid_input. Every physiological field must be a finite number; without that the SAPS II tables are not defined and the request is not billed.

Do I need PaO2/FiO2 if the patient was not ventilated?

No. When ventilated is false (the default), oxygenation points are zero and pao2_fio2 may be omitted. When ventilated is true, pao2_fio2 is required as a finite ratio in mmHg with FiO2 as a fraction.

Can I use this result to decide ICU admission or treatment?

No. This is an educational arithmetic aid, not medical advice. Intensity of care and prognosis need a licensed clinician and the rest of the clinical picture this calculator does not collect.

What does the SAPS II calculator cost?

The browser widget runs free and locally. The same computation via the API is billed at $0.002 per successful request from prepaid KIT balance; invalid_input failures are not charged.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/health/saps-ii

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/health/saps-ii \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"items":["valor-1","valor-2"]}'

const res = await fetch("https://api.kit.forhosting.com/health/saps-ii", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "items": [
      "valor-1",
      "valor-2"
    ]
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/health/saps-ii",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "items": [
        "valor-1",
        "valor-2"
    ]
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/health/saps-ii", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"items":["valor-1","valor-2"]}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"items":["valor-1","valor-2"]}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/health/saps-ii", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "items": [
    "valor-1",
    "valor-2"
  ]
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "health.saps_ii",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →