MAGENT

Respiratory · LIVE

PRESET-Score (Hilder)

PRESET

Sum the five Hilder 2017 PRESET-Score items and return class I–III with derivation ICU mortality.

LIVE $0.005 USDC GET /api/calc/preset

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

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

What it computes

Sum the five Hilder 2017 PRESET-Score items and return class I–III with derivation ICU mortality.

When to use

When an agent needs the published PRESET-Score total and must not invent a cannulation decision or a continuous logit.

When not to use

  • Not a medical device and not an ECMO cannulation, continuation, or withdrawal order. magent does not assay labs or examine the patient.
  • Five Hilder 2017 Table 4 categorical items only. There is no continuous logit. MAP is mm Hg, lactate mmol/L, arterial pH, platelets ×1000/µL, and hospital days before ECMO as assigned by the caller.
  • ICU mortality percents are the derivation-cohort classes (I 0–5 → 26%, II 6–9 → 68%, III 10–15 → 93%). They are not a website 0–3 / 4–5 class split.
  • Not RESP (Schmidt 2014), not SAVE, and not ECMOnet.

Formula

PRESET = map_points + lactate_points + ph_points + platelet_points + hospital_days_points; Hilder 2017 Table 4; MAP >100 → 0, 91-100 → 1, 81-90 → 2, 71-80 → 3, ≤70 → 4; lactate ≤1.50 → 0, 1.51-3.00 → 1, 3.01-6.00 → 2, 6.01-10.00 → 3, >10.00 → 4; arterial pH >7.300 → 0, 7.201-7.300 → 1, 7.101-7.200 → 2, ≤7.100 → 3; platelets >200 → 0, 101-200 → 1, ≤100 → 2; hospital days pre-ECMO ≤2 → 0, 3-7 → 1, >7 → 2; max 15; class I 0-5 (26%), II 6-9 (68%), III 10-15 (93%) derivation ICU mortality

Citation

Title
Comparison of mortality prediction models in acute respiratory distress syndrome undergoing extracorporeal membrane oxygenation and development of a novel prediction score: the PREdiction of Survival on ECMO Therapy-Score (PRESET-Score)
Authors
Hilder M, Herbstreit F, Adamzik M, et al.
Source
Crit Care. 2017;21(1):301
DOI
10.1186/s13054-017-1888-6

Worked example

All Table 4 items in the zero-point band

Given: arterial_ph=7.40hospital_days_pre_ecmo=1lactate_mmol_l=1.0mean_arterial_pressure_mm_hg=110platelets_k_ul=250

  1. MAP 110 → 0; lactate 1.0 → 0; pH 7.40 → 0; platelets 250 → 0; hospital days 1 → 0
  2. Score = 0 (max 15); class I; derivation ICU mortality 26%

All Table 4 items at maximum points

Given: arterial_ph=7.00hospital_days_pre_ecmo=10lactate_mmol_l=15mean_arterial_pressure_mm_hg=60platelets_k_ul=80

  1. MAP 60 → 4; lactate 15 → 4; pH 7.00 → 3; platelets 80 → 2; hospital days 10 → 2
  2. Score = 15 (max 15); class III; derivation ICU mortality 93%

Also searched as

  • PRESET-Score
  • PRESET score
  • PREdiction of Survival on ECMO Therapy-Score
  • Hilder PRESET
  • ECMO survival score
  • PRESET ECMO
  • Hilder 2017 score
  • PRESET ARDS ECMO

Try

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

/api/calc/preset?mean_arterial_pressure_mm_hg=110&lactate_mmol_l=1.0&arterial_ph=7.40&platelets_k_ul=250&hospital_days_pre_ecmo=1

Full URL: https://api.magentlab.com/api/calc/preset?mean_arterial_pressure_mm_hg=110&lactate_mmol_l=1.0&arterial_ph=7.40&platelets_k_ul=250&hospital_days_pre_ecmo=1

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/preset?mean_arterial_pressure_mm_hg=110&lactate_mmol_l=1.0&arterial_ph=7.40&platelets_k_ul=250&hospital_days_pre_ecmo=1"

Parameters

Name Type Required Description
mean_arterial_pressure_mm_hg number required Mean arterial pressure in mm Hg (20-250). Hilder 2017 Table 4: >100 → 0, 91-100 → 1, 81-90 → 2, 71-80 → 3, ≤70 → 4. magent does not measure blood pressure.
lactate_mmol_l number required Lactate in mmol/L (0.0-30.0). Hilder 2017 Table 4: ≤1.50 → 0, 1.51-3.00 → 1, 3.01-6.00 → 2, 6.01-10.00 → 3, >10.00 → 4. magent does not assay labs.
arterial_ph number required Arterial pH (6.5-8.0). Hilder 2017 Table 4: >7.300 → 0, 7.201-7.300 → 1, 7.101-7.200 → 2, ≤7.100 → 3. magent does not assay blood gas.
platelets_k_ul number required Platelet concentration ×1000/µL (1-2000). Hilder 2017 Table 4: >200 → 0, 101-200 → 1, ≤100 → 2. magent does not assay labs.
hospital_days_pre_ecmo integer required Hospital days before ECMO initiation (integer 0-365). Hilder 2017 Table 4: ≤2 → 0, 3-7 → 1, >7 → 2. Not a cannulation order.

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/preset 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": [
    {
      "arterial_ph": "7.40",
      "hospital_days_pre_ecmo": "1",
      "lactate_mmol_l": "1.0",
      "mean_arterial_pressure_mm_hg": "110",
      "platelets_k_ul": "250"
    },
    {
      "arterial_ph": "7.40",
      "hospital_days_pre_ecmo": "1",
      "lactate_mmol_l": "1.0",
      "mean_arterial_pressure_mm_hg": "110",
      "platelets_k_ul": "250"
    }
  ]
}

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/preset",
  "items": [
    {
      "components": [
        {
          "value": 110.0,
          "factor": "mean_arterial_pressure_mm_hg",
          "points": 0,
          "present": false
        },
        {
          "value": 1.0,
          "factor": "lactate_mmol_l",
          "points": 0,
          "present": false
        },
        {
          "value": 7.4,
          "factor": "arterial_ph",
          "points": 0,
          "present": false
        },
        {
          "value": 250.0,
          "factor": "platelets_k_ul",
          "points": 0,
          "present": false
        },
        {
          "value": 1,
          "factor": "hospital_days_pre_ecmo",
          "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": "Hilder M, Herbstreit F, Adamzik M, et al.",
        "doi": "10.1186/s13054-017-1888-6",
        "id": "hilder-2017",
        "pmid": "29233160",
        "source": "Crit Care. 2017;21(1):301",
        "title": "Comparison of mortality prediction models in acute respiratory distress syndrome undergoing extracorporeal membrane oxygenation and development of a novel prediction score: the PREdiction of Survival on ECMO Therapy-Score (PRESET-Score)"
      },
      "formula": "preset",
      "formula_expression": "PRESET = map_points + lactate_points + ph_points + platelet_points + hospital_days_points; Hilder 2017 Table 4; MAP >100 → 0, 91-100 → 1, 81-90 → 2, 71-80 → 3, ≤70 → 4; lactate ≤1.50 → 0, 1.51-3.00 → 1, 3.01-6.00 → 2, 6.01-10.00 → 3, >10.00 → 4; arterial pH >7.300 → 0, 7.201-7.300 → 1, 7.101-7.200 → 2, ≤7.100 → 3; platelets >200 → 0, 101-200 → 1, ≤100 → 2; hospital days pre-ECMO ≤2 → 0, 3-7 → 1, >7 → 2; max 15; class I 0-5 (26%), II 6-9 (68%), III 10-15 (93%) derivation ICU mortality",
      "max_score": 15,
      "score": 0,
      "arterial_ph": 7.4,
      "platelets_k_ul": 250.0,
      "hospital_days_pre_ecmo": 1,
      "icu_mortality_percent": 26,
      "lactate_mmol_l": 1.0,
      "mean_arterial_pressure_mm_hg": 110.0,
      "preset_class": "I"
    },
    {
      "components": [
        {
          "value": 110.0,
          "factor": "mean_arterial_pressure_mm_hg",
          "points": 0,
          "present": false
        },
        {
          "value": 1.0,
          "factor": "lactate_mmol_l",
          "points": 0,
          "present": false
        },
        {
          "value": 7.4,
          "factor": "arterial_ph",
          "points": 0,
          "present": false
        },
        {
          "value": 250.0,
          "factor": "platelets_k_ul",
          "points": 0,
          "present": false
        },
        {
          "value": 1,
          "factor": "hospital_days_pre_ecmo",
          "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": "Hilder M, Herbstreit F, Adamzik M, et al.",
        "doi": "10.1186/s13054-017-1888-6",
        "id": "hilder-2017",
        "pmid": "29233160",
        "source": "Crit Care. 2017;21(1):301",
        "title": "Comparison of mortality prediction models in acute respiratory distress syndrome undergoing extracorporeal membrane oxygenation and development of a novel prediction score: the PREdiction of Survival on ECMO Therapy-Score (PRESET-Score)"
      },
      "formula": "preset",
      "formula_expression": "PRESET = map_points + lactate_points + ph_points + platelet_points + hospital_days_points; Hilder 2017 Table 4; MAP >100 → 0, 91-100 → 1, 81-90 → 2, 71-80 → 3, ≤70 → 4; lactate ≤1.50 → 0, 1.51-3.00 → 1, 3.01-6.00 → 2, 6.01-10.00 → 3, >10.00 → 4; arterial pH >7.300 → 0, 7.201-7.300 → 1, 7.101-7.200 → 2, ≤7.100 → 3; platelets >200 → 0, 101-200 → 1, ≤100 → 2; hospital days pre-ECMO ≤2 → 0, 3-7 → 1, >7 → 2; max 15; class I 0-5 (26%), II 6-9 (68%), III 10-15 (93%) derivation ICU mortality",
      "max_score": 15,
      "score": 0,
      "arterial_ph": 7.4,
      "platelets_k_ul": 250.0,
      "hospital_days_pre_ecmo": 1,
      "icu_mortality_percent": 26,
      "lactate_mmol_l": 1.0,
      "mean_arterial_pressure_mm_hg": 110.0,
      "preset_class": "I"
    }
  ]
}

Response

Field Type Description
formula string preset
formula_expression string Exact expression used
score integer PRESET-Score points 0-15
max_score integer Always 15
preset_class string Hilder 2017 derivation risk class I (0-5), II (6-9), or III (10-15). Not a 0-3 / 4-5 website split.
icu_mortality_percent integer Derivation-cohort ICU mortality for that class: 26 (I), 68 (II), or 93 (III).
mean_arterial_pressure_mm_hg number MAP used, mm Hg
lactate_mmol_l number Lactate used, mmol/L
arterial_ph number Arterial pH used
platelets_k_ul number Platelets used, ×1000/µL
hospital_days_pre_ecmo integer Hospital days before ECMO used
components array Per-item points
citation object Hilder et al. Crit Care 2017 citation
disclaimer string Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 110.0,
      "factor": "mean_arterial_pressure_mm_hg",
      "points": 0,
      "present": false
    },
    {
      "value": 1.0,
      "factor": "lactate_mmol_l",
      "points": 0,
      "present": false
    },
    {
      "value": 7.4,
      "factor": "arterial_ph",
      "points": 0,
      "present": false
    },
    {
      "value": 250.0,
      "factor": "platelets_k_ul",
      "points": 0,
      "present": false
    },
    {
      "value": 1,
      "factor": "hospital_days_pre_ecmo",
      "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": "Hilder M, Herbstreit F, Adamzik M, et al.",
    "doi": "10.1186/s13054-017-1888-6",
    "id": "hilder-2017",
    "pmid": "29233160",
    "source": "Crit Care. 2017;21(1):301",
    "title": "Comparison of mortality prediction models in acute respiratory distress syndrome undergoing extracorporeal membrane oxygenation and development of a novel prediction score: the PREdiction of Survival on ECMO Therapy-Score (PRESET-Score)"
  },
  "formula": "preset",
  "formula_expression": "PRESET = map_points + lactate_points + ph_points + platelet_points + hospital_days_points; Hilder 2017 Table 4; MAP >100 → 0, 91-100 → 1, 81-90 → 2, 71-80 → 3, ≤70 → 4; lactate ≤1.50 → 0, 1.51-3.00 → 1, 3.01-6.00 → 2, 6.01-10.00 → 3, >10.00 → 4; arterial pH >7.300 → 0, 7.201-7.300 → 1, 7.101-7.200 → 2, ≤7.100 → 3; platelets >200 → 0, 101-200 → 1, ≤100 → 2; hospital days pre-ECMO ≤2 → 0, 3-7 → 1, >7 → 2; max 15; class I 0-5 (26%), II 6-9 (68%), III 10-15 (93%) derivation ICU mortality",
  "max_score": 15,
  "score": 0,
  "arterial_ph": 7.4,
  "platelets_k_ul": 250.0,
  "hospital_days_pre_ecmo": 1,
  "icu_mortality_percent": 26,
  "lactate_mmol_l": 1.0,
  "mean_arterial_pressure_mm_hg": 110.0,
  "preset_class": "I"
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_preset PRESET needs Hilder 2017 MAP, lactate, pH, platelets, and pre-ECMO hospital days in published ranges. Returned before settlement; you are not charged.
400 invalid_items POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400 invalid_item_count items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400 invalid_item each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

  • RESP — Sum Schmidt 2014 Table 3 RESP points from caller-assigned pre-ECMO predictors and return class I–V with published hospital survival percents.
  • APACHE II — Compute the Knaus 1985 APACHE II integer from 12 Acute Physiology Score items, age points, and chronic-health points.

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.