ForHosting KIT · Developer Utilities

Urine anion gap calculator

Urine anion gap calculator: enter your values and see a clear result on this page. Free for individual checks; API from $0.002.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

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

How is the urine anion gap calculated?

Urine anion gap = urine sodium + urine potassium − urine chloride, all in mEq/L. Send those three required fields; the response includes urine_anion_gap, gap_sign, and a readable formula string.

What happens if an electrolyte concentration is negative?

The request fails with invalid_input. Negative urine sodium, potassium, or chloride values are rejected and not charged.

Is a negative urine anion gap the same as a serum anion gap?

No. The serum anion gap is sodium minus chloride minus bicarbonate. The urine anion gap is urine sodium plus urine potassium minus urine chloride. They answer different teaching questions and use different samples.

What do positive and negative gap_sign values mean in teaching?

gap_sign is arithmetic, not a diagnosis. Textbooks often treat a negative leftover as extra urinary ammonium (GI bicarbonate-loss examples) and a positive leftover as low ammonium (renal-tubular-acidosis examples). This calculator only reports the sign of Na + K − Cl.

What does the urine anion gap calculator cost?

The browser tool runs free on your device. API calls use prepaid KIT balance at $0.002 per successful item; validation 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/urine-anion-gap

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/urine-anion-gap \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"urine_sodium":40,"urine_potassium":20,"urine_chloride":80}'

const res = await fetch("https://api.kit.forhosting.com/health/urine-anion-gap", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "urine_sodium": 40,
    "urine_potassium": 20,
    "urine_chloride": 80
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/health/urine-anion-gap",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "urine_sodium": 40,
    "urine_potassium": 20,
    "urine_chloride": 80
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/health/urine-anion-gap", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"urine_sodium":40,"urine_potassium":20,"urine_chloride":80}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"urine_sodium":40,"urine_potassium":20,"urine_chloride":80}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/health/urine-anion-gap", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "urine_sodium": 40,
  "urine_potassium": 20,
  "urine_chloride": 80
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "health.urine_anion_gap",
  "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 →