Electrolytes / glucose · LIVE

Bicarbonate deficit (Adrogué–Madias)

Bicarbonate deficit

Estimate bicarbonate deficit from weight and measured plasma HCO3 using a 50 percent body-weight apparent space.

LIVE $0.005 USDC GET /api/calc/bicarbonate_deficit

Markdown: /docs/bicarbonate-deficit.md · Canonical: https://magentlab.com/docs/bicarbonate-deficit

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Estimate bicarbonate deficit from weight and measured plasma HCO3 using a 50 percent body-weight apparent space.

When to use

When an agent needs Adrogué–Madias deficit arithmetic and must not invent a bicarbonate space or replacement amount.

When not to use

• Not a treatment order and not a bicarbonate dosing protocol. The paper uses 50 percent of body weight only as a starting space and a safety target near 8–10 mmol/L, not full correction to 24.
• Apparent space can reach 100 percent of body weight or more in extreme acidemia. This tool does not switch space with HCO3, ongoing acid production, or ventilation.

Formula

bicarbonate_space_L = 0.5 * weight_kg; deficit_mEq = bicarbonate_space_L * (desired_hco3 - measured_hco3)

Citation

Title

Management of life-threatening acid-base disorders. First of two parts

Authors

Adrogué HJ, Madias NE

Source

N Engl J Med. 1998;338(1):26-34

DOI

10.1056/NEJM199801013380106

Worked example

Also searched as

• bicarbonate deficit
• HCO3 deficit
• Adrogue Madias bicarbonate
• bicarb replacement estimate

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/bicarbonate_deficit?weight_kg=70&bicarbonate_mmol_l=4&desired_hco3_mmol_l=8

Full URL: https://api.magentlab.com/api/calc/bicarbonate_deficit?weight_kg=70&bicarbonate_mmol_l=4&desired_hco3_mmol_l=8

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/bicarbonate_deficit?weight_kg=70&bicarbonate_mmol_l=4&desired_hco3_mmol_l=8"

Parameters

Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

POST /api/calc/bicarbonate_deficit Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
• The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
• HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
• Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
• x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request (fixture)

{
  "items": [
    {
      "bicarbonate_mmol_l": "4",
      "desired_hco3_mmol_l": "8",
      "weight_kg": "70"
    },
    {
      "bicarbonate_mmol_l": "4",
      "desired_hco3_mmol_l": "8",
      "weight_kg": "70"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/bicarbonate_deficit",
  "items": [
    {
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Adrogué HJ, Madias NE",
        "doi": "10.1056/NEJM199801013380106",
        "id": "adrogue-madias-1998",
        "source": "N Engl J Med. 1998;338(1):26-34",
        "title": "Management of life-threatening acid-base disorders. First of two parts"
      },
      "formula": "adrogue_madias",
      "formula_expression": "bicarbonate_space_L = 0.5 * weight_kg; deficit_mEq = bicarbonate_space_L * (desired_hco3 - measured_hco3)",
      "bicarbonate_mmol_l": 4.0,
      "weight_kg": 70.0,
      "bicarbonate_space_l": 35.0,
      "deficit_meq": 140.0,
      "desired_hco3_mmol_l": 8.0
    },
    {
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Adrogué HJ, Madias NE",
        "doi": "10.1056/NEJM199801013380106",
        "id": "adrogue-madias-1998",
        "source": "N Engl J Med. 1998;338(1):26-34",
        "title": "Management of life-threatening acid-base disorders. First of two parts"
      },
      "formula": "adrogue_madias",
      "formula_expression": "bicarbonate_space_L = 0.5 * weight_kg; deficit_mEq = bicarbonate_space_L * (desired_hco3 - measured_hco3)",
      "bicarbonate_mmol_l": 4.0,
      "weight_kg": 70.0,
      "bicarbonate_space_l": 35.0,
      "deficit_meq": 140.0,
      "desired_hco3_mmol_l": 8.0
    }
  ]
}

Response

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Adrogué HJ, Madias NE",
    "doi": "10.1056/NEJM199801013380106",
    "id": "adrogue-madias-1998",
    "source": "N Engl J Med. 1998;338(1):26-34",
    "title": "Management of life-threatening acid-base disorders. First of two parts"
  },
  "formula": "adrogue_madias",
  "formula_expression": "bicarbonate_space_L = 0.5 * weight_kg; deficit_mEq = bicarbonate_space_L * (desired_hco3 - measured_hco3)",
  "bicarbonate_mmol_l": 4.0,
  "weight_kg": 70.0,
  "bicarbonate_space_l": 35.0,
  "deficit_meq": 140.0,
  "desired_hco3_mmol_l": 8.0
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

Related tools

• Corrected calcium — Compute Payne albumin-corrected calcium from total calcium and albumin.
• Corrected sodium — Compute expected sodium in hyperglycemia using Katz 1.6 or Hillier 2.4. The formula argument is required.

Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /docs/mcp.

Guarantees

• HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
• exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
• HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
• Execution is timeout-bounded and concurrency-capped.
• Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.