ForHosting KIT · Developer Utilities

PSI calculator

The Pneumonia Severity Index, also published as the PORT score after the Pneumonia Patient Outcomes Research Team, is a widely taught additive rule for community-acquired pneumonia.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

This calculator implements the Fine 1997 two-step algorithm: it converts demographics, five comorbidity flags, vital-sign thresholds, and laboratory cutoffs into a point total, then assigns risk class I through V with a published 30-day mortality band and a disposition hint. Age must be a finite positive number; a missing, zero, negative, or non-numeric age fails with invalid_input and is not billed. Optional flags and labs that you omit contribute zero points, which means they are treated as not meeting that criterion. The same deterministic module powers the free browser widget and the API, so teaching pages, research coding, and product prototypes never disagree on a given vignette. Treat the JSON as a transparent arithmetic aid, 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 Pneumonia Severity Index (PSI / PORT score)?

It is Fine’s 1997 additive rule for community-acquired pneumonia. This tool returns the point total, risk class I–V, a short label, a PORT validation mortality percentage, and a teaching disposition hint.

How is the PSI score calculated from the inputs?

Men receive their age as points and women receive age minus 10. Nursing-home residence, five comorbidities, five exam thresholds, and selected lab or radiographic cutoffs add the published Fine weights. Class I is assigned in Step 1 when age is 50 or under and those comorbidity and exam screens are all negative.

What happens if age is zero, negative, or missing?

The call fails with invalid_input. Age must be a finite positive number; without it the Pneumonia Severity Index is not defined and the request is not billed.

How should I interpret risk classes I through V?

Classes I and II are taught as very low and low risk (often outpatient). Class III is moderate risk (observation or a short stay). Classes IV and V are high and very high risk (inpatient teaching strata). Figures are historical cohort rates, not a personal prognosis.

Can I use this result to decide admission or treatment?

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

What does the PSI 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/psi

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/psi \
  -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/psi", {
  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/psi",
    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/psi", 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/psi", 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.psi",
  "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 →