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Gupta postoperative respiratory failure

Gupta PRF

Compute the Gupta 2011 Chest logistic probability of postoperative respiratory failure (mechanical ventilation >48 h after surgery or unplanned intubation within 30 days) from ASA class, functional status, preoperative sepsis, emergency case, and surgery type.

LIVE $0.005 USDC GET /api/calc/gupta_prf

Markdown: /docs/gupta-prf.md · Canonical: https://magentlab.com/docs/gupta-prf

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

What it computes

Compute the Gupta 2011 Chest logistic probability of postoperative respiratory failure (mechanical ventilation >48 h after surgery or unplanned intubation within 30 days) from ASA class, functional status, preoperative sepsis, emergency case, and surgery type.

When to use

When an agent needs the published Gupta 2011 Chest PRF probability and must not invent a ventilator order, a diagnosis, ARISCAT points, or a low/high cutoff.

When not to use

• Not a medical device. Not a diagnosis and not a ventilator order.
• Gupta 2011 Chest logistic PRF model only. This is not ARISCAT and not a surgical clearance.
• Gupta 2011 does not publish a low or high PRF cutoff; magent does not invent one.
• Age and laboratory values are not in the published table.
• functional_status, sepsis, emergency, and surgery are caller-assigned published categories. magent does not examine the patient or classify the procedure from a CPT code.

Formula

L = -1.7397 + functional_status + asa_class + sepsis + emergency + surgery (Gupta 2011 Chest logistic table); independent 0, partially_dependent 0.7678, totally_dependent 1.4046; ASA1 -3.5265, ASA2 -2.0008, ASA3 -0.6201, ASA4 0.2441, ASA5 0; sepsis none -0.7840, sirs 0, sepsis 0.2752, septic_shock 0.9035; elective -0.5739, emergency 0; hernia 0, anorectal -1.3530, aortic 1.0781, bariatric -1.0112, brain 0.7336, breast -2.6462, cardiac 0.2744, ent 0.1060, foregut_hpb 0.9694, gbaas -0.5668, intestinal 0.5737, neck -0.5271, obstetric_gynecologic -1.2431, orthopedic -0.8577, other_abdomen 0.2416, peripheral_vascular -0.2389, skin -0.3206, spine -0.5220, thoracic 0.6715, vein -2.0080, urology 0.3093; estimated_probability_percent = 100 * exp(L) / (1 + exp(L))

Citation

Title

Development and validation of a risk calculator predicting postoperative respiratory failure

Authors

Gupta H, Gupta PK, Fang X, Miller WJ, Cemaj S, Forse RA, Morrow LE

Source

Chest. 2011;140(5):1207-1215

DOI

10.1378/chest.11-0466

Worked example

Also searched as

• Gupta PRF
• postoperative respiratory failure
• Gupta 2011 Chest respiratory failure
• unplanned intubation after surgery
• mechanical ventilation after surgery
• NSQIP respiratory failure probability
• Gupta perioperative pulmonary risk
• postoperative reintubation probability

Try

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

/api/calc/gupta_prf?functional_status=independent&asa_class=2&sepsis=none&emergency=false&surgery=hernia

Full URL: https://api.magentlab.com/api/calc/gupta_prf?functional_status=independent&asa_class=2&sepsis=none&emergency=false&surgery=hernia

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/gupta_prf?functional_status=independent&asa_class=2&sepsis=none&emergency=false&surgery=hernia"

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/gupta_prf 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": [
    {
      "asa_class": "2",
      "emergency": "false",
      "functional_status": "independent",
      "sepsis": "none",
      "surgery": "hernia"
    },
    {
      "asa_class": "2",
      "emergency": "false",
      "functional_status": "independent",
      "sepsis": "none",
      "surgery": "hernia"
    }
  ]
}

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/gupta_prf",
  "items": [
    {
      "emergency": 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": "Gupta H, Gupta PK, Fang X, Miller WJ, Cemaj S, Forse RA, Morrow LE",
        "doi": "10.1378/chest.11-0466",
        "id": "gupta-2011-prf",
        "pmid": "21757571",
        "source": "Chest. 2011;140(5):1207-1215",
        "title": "Development and validation of a risk calculator predicting postoperative respiratory failure"
      },
      "formula": "gupta_prf",
      "formula_expression": "L = -1.7397 + functional_status + asa_class + sepsis + emergency + surgery (Gupta 2011 Chest logistic table); independent 0, partially_dependent 0.7678, totally_dependent 1.4046; ASA1 -3.5265, ASA2 -2.0008, ASA3 -0.6201, ASA4 0.2441, ASA5 0; sepsis none -0.7840, sirs 0, sepsis 0.2752, septic_shock 0.9035; elective -0.5739, emergency 0; hernia 0, anorectal -1.3530, aortic 1.0781, bariatric -1.0112, brain 0.7336, breast -2.6462, cardiac 0.2744, ent 0.1060, foregut_hpb 0.9694, gbaas -0.5668, intestinal 0.5737, neck -0.5271, obstetric_gynecologic -1.2431, orthopedic -0.8577, other_abdomen 0.2416, peripheral_vascular -0.2389, skin -0.3206, spine -0.5220, thoracic 0.6715, vein -2.0080, urology 0.3093; estimated_probability_percent = 100 * exp(L) / (1 + exp(L))",
      "estimated_probability_percent": 0.61,
      "logit": -5.0984,
      "asa_class": 2,
      "surgery": "hernia",
      "functional_status": "independent",
      "sepsis": "none"
    },
    {
      "emergency": 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": "Gupta H, Gupta PK, Fang X, Miller WJ, Cemaj S, Forse RA, Morrow LE",
        "doi": "10.1378/chest.11-0466",
        "id": "gupta-2011-prf",
        "pmid": "21757571",
        "source": "Chest. 2011;140(5):1207-1215",
        "title": "Development and validation of a risk calculator predicting postoperative respiratory failure"
      },
      "formula": "gupta_prf",
      "formula_expression": "L = -1.7397 + functional_status + asa_class + sepsis + emergency + surgery (Gupta 2011 Chest logistic table); independent 0, partially_dependent 0.7678, totally_dependent 1.4046; ASA1 -3.5265, ASA2 -2.0008, ASA3 -0.6201, ASA4 0.2441, ASA5 0; sepsis none -0.7840, sirs 0, sepsis 0.2752, septic_shock 0.9035; elective -0.5739, emergency 0; hernia 0, anorectal -1.3530, aortic 1.0781, bariatric -1.0112, brain 0.7336, breast -2.6462, cardiac 0.2744, ent 0.1060, foregut_hpb 0.9694, gbaas -0.5668, intestinal 0.5737, neck -0.5271, obstetric_gynecologic -1.2431, orthopedic -0.8577, other_abdomen 0.2416, peripheral_vascular -0.2389, skin -0.3206, spine -0.5220, thoracic 0.6715, vein -2.0080, urology 0.3093; estimated_probability_percent = 100 * exp(L) / (1 + exp(L))",
      "estimated_probability_percent": 0.61,
      "logit": -5.0984,
      "asa_class": 2,
      "surgery": "hernia",
      "functional_status": "independent",
      "sepsis": "none"
    }
  ]
}

Response

Example JSON

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

{
  "emergency": 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": "Gupta H, Gupta PK, Fang X, Miller WJ, Cemaj S, Forse RA, Morrow LE",
    "doi": "10.1378/chest.11-0466",
    "id": "gupta-2011-prf",
    "pmid": "21757571",
    "source": "Chest. 2011;140(5):1207-1215",
    "title": "Development and validation of a risk calculator predicting postoperative respiratory failure"
  },
  "formula": "gupta_prf",
  "formula_expression": "L = -1.7397 + functional_status + asa_class + sepsis + emergency + surgery (Gupta 2011 Chest logistic table); independent 0, partially_dependent 0.7678, totally_dependent 1.4046; ASA1 -3.5265, ASA2 -2.0008, ASA3 -0.6201, ASA4 0.2441, ASA5 0; sepsis none -0.7840, sirs 0, sepsis 0.2752, septic_shock 0.9035; elective -0.5739, emergency 0; hernia 0, anorectal -1.3530, aortic 1.0781, bariatric -1.0112, brain 0.7336, breast -2.6462, cardiac 0.2744, ent 0.1060, foregut_hpb 0.9694, gbaas -0.5668, intestinal 0.5737, neck -0.5271, obstetric_gynecologic -1.2431, orthopedic -0.8577, other_abdomen 0.2416, peripheral_vascular -0.2389, skin -0.3206, spine -0.5220, thoracic 0.6715, vein -2.0080, urology 0.3093; estimated_probability_percent = 100 * exp(L) / (1 + exp(L))",
  "estimated_probability_percent": 0.61,
  "logit": -5.0984,
  "asa_class": 2,
  "surgery": "hernia",
  "functional_status": "independent",
  "sepsis": "none"
}

Client errors (HTTP 400)

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

Related tools

• Gupta MICA — Compute the Gupta 2011 Table 2 logistic probability of 30-day myocardial infarction or cardiac arrest after surgery from age, ASA class, functional status, creatinine category, and surgery type.
• ARISCAT — Sum Canet 2010 Table 6 simplified ARISCAT points (β×10 rounded) from age, preoperative SpO2, respiratory infection, anemia flag, incision, duration of surgery, and emergency, and return the published low / intermediate / high band.

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.