Emergency · LIVE

PONS perioperative nutrition screen

PONS

Sum the four Wischmeyer 2018 Perioperative Nutrition Screen (PONS) flags and return whether any item is positive (high nutritional risk).

LIVE $0.005 USDC GET /api/calc/pons

Markdown: /docs/pons.md · Canonical: https://magentlab.com/docs/pons

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

What it computes

Sum the four Wischmeyer 2018 Perioperative Nutrition Screen (PONS) flags and return whether any item is positive (high nutritional risk).

When to use

When an agent has caller-assigned Wischmeyer 2018 PONS questions and needs the published point total and high-risk flag, not a diet order, not a malnutrition diagnosis, and without computing BMI or assaying albumin.

When not to use

• Not a medical device.
• Not a diet order or malnutrition diagnosis.
• magent does not weigh the patient, compute BMI, or assay albumin. The caller assigns each flag. magent does not take height, weight, age, or albumin as numeric inputs.
• Albumin cutoff is <3.0 g/dL (Wischmeyer 2018), not 3 g/L.
• This is not NRS-2002, not NUTRIC, and not MUST.

Formula

PONS = bmi_low + weight_loss_gt_10pct_6mo + oral_intake_reduced_gt_50pct_week + albumin_lt_3_g_dl; each 1 if true; max 4; high_risk iff score ≥ 1

Citation

Title

American Society for Enhanced Recovery and Perioperative Quality Initiative Joint Consensus Statement on Nutrition Screening and Therapy Within a Surgical Enhanced Recovery Pathway

Authors

Wischmeyer PE, Carli F, Evans DC, et al.

Source

Anesth Analg. 2018;126(6):1883-1895

DOI

10.1213/ANE.0000000000002743

Worked example

Also searched as

• PONS
• Perioperative Nutrition Screen
• Wischmeyer PONS
• perioperative nutrition screening
• PONS score
• surgical nutrition screen
• PONS questionnaire

Try

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

/api/calc/pons?bmi_low=false&weight_loss_gt_10pct_6mo=false&oral_intake_reduced_gt_50pct_week=false&albumin_lt_3_g_dl=false

Full URL: https://api.magentlab.com/api/calc/pons?bmi_low=false&weight_loss_gt_10pct_6mo=false&oral_intake_reduced_gt_50pct_week=false&albumin_lt_3_g_dl=false

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/pons?bmi_low=false&weight_loss_gt_10pct_6mo=false&oral_intake_reduced_gt_50pct_week=false&albumin_lt_3_g_dl=false"

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/pons 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": [
    {
      "albumin_lt_3_g_dl": "false",
      "bmi_low": "false",
      "oral_intake_reduced_gt_50pct_week": "false",
      "weight_loss_gt_10pct_6mo": "false"
    },
    {
      "albumin_lt_3_g_dl": "false",
      "bmi_low": "false",
      "oral_intake_reduced_gt_50pct_week": "false",
      "weight_loss_gt_10pct_6mo": "false"
    }
  ]
}

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/pons",
  "items": [
    {
      "components": [
        {
          "factor": "bmi_low",
          "points": 0,
          "present": false
        },
        {
          "factor": "weight_loss_gt_10pct_6mo",
          "points": 0,
          "present": false
        },
        {
          "factor": "oral_intake_reduced_gt_50pct_week",
          "points": 0,
          "present": false
        },
        {
          "factor": "albumin_lt_3_g_dl",
          "points": 0,
          "present": false
        }
      ],
      "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": "Wischmeyer PE, Carli F, Evans DC, et al.",
        "doi": "10.1213/ANE.0000000000002743",
        "id": "wischmeyer-2018",
        "pmid": "29369092",
        "source": "Anesth Analg. 2018;126(6):1883-1895",
        "title": "American Society for Enhanced Recovery and Perioperative Quality Initiative Joint Consensus Statement on Nutrition Screening and Therapy Within a Surgical Enhanced Recovery Pathway"
      },
      "formula": "pons",
      "formula_expression": "PONS = bmi_low + weight_loss_gt_10pct_6mo + oral_intake_reduced_gt_50pct_week + albumin_lt_3_g_dl; each 1 if true; max 4; high_risk iff score ≥ 1",
      "max_score": 4,
      "score": 0,
      "high_risk": false
    },
    {
      "components": [
        {
          "factor": "bmi_low",
          "points": 0,
          "present": false
        },
        {
          "factor": "weight_loss_gt_10pct_6mo",
          "points": 0,
          "present": false
        },
        {
          "factor": "oral_intake_reduced_gt_50pct_week",
          "points": 0,
          "present": false
        },
        {
          "factor": "albumin_lt_3_g_dl",
          "points": 0,
          "present": false
        }
      ],
      "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": "Wischmeyer PE, Carli F, Evans DC, et al.",
        "doi": "10.1213/ANE.0000000000002743",
        "id": "wischmeyer-2018",
        "pmid": "29369092",
        "source": "Anesth Analg. 2018;126(6):1883-1895",
        "title": "American Society for Enhanced Recovery and Perioperative Quality Initiative Joint Consensus Statement on Nutrition Screening and Therapy Within a Surgical Enhanced Recovery Pathway"
      },
      "formula": "pons",
      "formula_expression": "PONS = bmi_low + weight_loss_gt_10pct_6mo + oral_intake_reduced_gt_50pct_week + albumin_lt_3_g_dl; each 1 if true; max 4; high_risk iff score ≥ 1",
      "max_score": 4,
      "score": 0,
      "high_risk": false
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "factor": "bmi_low",
      "points": 0,
      "present": false
    },
    {
      "factor": "weight_loss_gt_10pct_6mo",
      "points": 0,
      "present": false
    },
    {
      "factor": "oral_intake_reduced_gt_50pct_week",
      "points": 0,
      "present": false
    },
    {
      "factor": "albumin_lt_3_g_dl",
      "points": 0,
      "present": false
    }
  ],
  "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": "Wischmeyer PE, Carli F, Evans DC, et al.",
    "doi": "10.1213/ANE.0000000000002743",
    "id": "wischmeyer-2018",
    "pmid": "29369092",
    "source": "Anesth Analg. 2018;126(6):1883-1895",
    "title": "American Society for Enhanced Recovery and Perioperative Quality Initiative Joint Consensus Statement on Nutrition Screening and Therapy Within a Surgical Enhanced Recovery Pathway"
  },
  "formula": "pons",
  "formula_expression": "PONS = bmi_low + weight_loss_gt_10pct_6mo + oral_intake_reduced_gt_50pct_week + albumin_lt_3_g_dl; each 1 if true; max 4; high_risk iff score ≥ 1",
  "max_score": 4,
  "score": 0,
  "high_risk": false
}

Client errors (HTTP 400)

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

Related tools

• NRS-2002 — Sum Kondrup 2003 NRS-2002 impaired nutritional status (0–3), disease severity (0–3), and 1 if age ≥70, and return whether the total is at nutritional risk (score ≥3).
• NUTRIC — Sum Heyland 2011 original 6-variable NUTRIC (Nutrition Risk in the Critically Ill) Table 4 overall points, including IL-6, and return whether the total is high nutrition risk (score ≥6).
• MUST — Sum Stratton 2004 MUST (BMI, unplanned weight-loss percent, and acute disease with no nutritional intake >5 days) and return score 0–6 with risk low, medium, or high.

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.