MuLBSTA viral pneumonia score

MuLBSTA

Sum Guo 2019 MuLBSTA points from age, exclusive smoking status, absolute lymphocyte count, and caller-assigned flags, and return the published total (max 20) and low/high band.

LIVE $0.005 USDC GET /api/calc/mulbsta

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

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

What it computes

Sum Guo 2019 MuLBSTA points from age, exclusive smoking status, absolute lymphocyte count, and caller-assigned flags, and return the published total (max 20) and low/high band.

When to use

When an agent has already assigned Guo 2019 MuLBSTA inputs and needs the published point total and low (0-11) or high (≥12) band, not a viral-species diagnosis or a treatment order.

When not to use

Not a medical device and not a viral-species diagnosis, site-of-care decision, or treatment order.
magent does not read imaging or assign smoking history. multilobular_infiltrates, bacterial_coinfection, hypertension, and smoking are caller-assigned.
Smoking is mutually exclusive: never (0), former / quit-smoker (2), or current / acute-smoker (3). Current and former cannot both apply. Max score is 20, not the paper Table 5 12-22 wording.
Bands follow Guo 2019 only: low score 0-11 (paper mortality 5.07%) and high score ≥12 (paper 33.92%). No other cut-points.

Formula

MuLBSTA = multilobular_infiltrates 5 + lymphocyte_k_ul<=0.8 4 + bacterial_coinfection 4 + smoking (never 0, former 2, current 3; exclusive) + hypertension 2 + age>=60 2; Guo 2019; max 20; low 0-11, high >=12

Citation

Title: Clinical Features Predicting Mortality Risk in Patients With Viral Pneumonia: The MuLBSTA Score
Authors: Guo L, Wei D, Zhang X, Wu Y, Li Q, Zhou M, Qu J
Source: Front Microbiol. 2019;10:2752
DOI: 10.3389/fmicb.2019.02752

Worked example

Age 50, never smoked, lymphocytes 1.5, all flags false

Given: age=50bacterial_coinfection=falsehypertension=falselymphocyte_k_ul=1.5multilobular_infiltrates=falsesmoking=never

Age <60 → 0; smoking never → 0; lymphocyte_k_ul 1.5 >0.8 → 0; all flags false → 0
Score = 0 (max 20); mulbsta_band low

Current smoking, lymphopenia, and multilobular infiltrates

Given: age=50bacterial_coinfection=falsehypertension=falselymphocyte_k_ul=0.8multilobular_infiltrates=truesmoking=current

multilobular_infiltrates → 5; lymphocyte_k_ul 0.8 → 4; smoking current → 3
Score = 12 (max 20); mulbsta_band high

Also searched as

MuLBSTA
MuLBSTA score
Guo viral pneumonia score
multilobar lymphocyte bacterial smoking
viral pneumonia mortality score
Guo 2019 MuLBSTA

Try

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

/api/calc/mulbsta?age=50&smoking=never&lymphocyte_k_ul=1.5&multilobular_infiltrates=false&bacterial_coinfection=false&hypertension=false

Full URL: https://api.magentlab.com/api/calc/mulbsta?age=50&smoking=never&lymphocyte_k_ul=1.5&multilobular_infiltrates=false&bacterial_coinfection=false&hypertension=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/mulbsta?age=50&smoking=never&lymphocyte_k_ul=1.5&multilobular_infiltrates=false&bacterial_coinfection=false&hypertension=false"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years (18-120). Age ≥60 scores 2 (Guo 2019). magent does not compute age.
`smoking`	string	required	Exclusive Guo 2019 smoking status: never (0), former / quit-smoker (2), or current / acute-smoker (3). Current and former cannot both apply. Assigned by the caller; magent does not assign smoking history.
`lymphocyte_k_ul`	number	required	Absolute lymphocyte count ×10^9/L (0.05-20). Scores 4 when ≤0.8 (Guo 2019). magent does not read a CBC.
`multilobular_infiltrates`	boolean	required	Multilobular infiltrates as assigned by the caller (Guo 2019). true scores 5. magent does not read imaging.
`bacterial_coinfection`	boolean	required	Bacterial coinfection as assigned by the caller (Guo 2019). true scores 4. magent does not diagnose coinfection.
`hypertension`	boolean	required	Hypertension as assigned by the caller (Guo 2019). true scores 2. magent does not take a blood pressure.

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/mulbsta 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": [
    {
      "age": "50",
      "bacterial_coinfection": "false",
      "hypertension": "false",
      "lymphocyte_k_ul": "1.5",
      "multilobular_infiltrates": "false",
      "smoking": "never"
    },
    {
      "age": "50",
      "bacterial_coinfection": "false",
      "hypertension": "false",
      "lymphocyte_k_ul": "1.5",
      "multilobular_infiltrates": "false",
      "smoking": "never"
    }
  ]
}

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/mulbsta",
  "items": [
    {
      "components": [
        {
          "factor": "multilobular_infiltrates",
          "points": 0,
          "present": false
        },
        {
          "value": 1.5,
          "factor": "lymphocyte_le_0_8",
          "points": 0,
          "present": false
        },
        {
          "factor": "bacterial_coinfection",
          "points": 0,
          "present": false
        },
        {
          "value": "never",
          "factor": "smoking",
          "points": 0,
          "present": false
        },
        {
          "factor": "hypertension",
          "points": 0,
          "present": false
        },
        {
          "value": 50,
          "factor": "age_ge_60",
          "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": "Guo L, Wei D, Zhang X, Wu Y, Li Q, Zhou M, Qu J",
        "doi": "10.3389/fmicb.2019.02752",
        "id": "guo-2019",
        "pmid": "31849894",
        "source": "Front Microbiol. 2019;10:2752",
        "title": "Clinical Features Predicting Mortality Risk in Patients With Viral Pneumonia: The MuLBSTA Score"
      },
      "formula": "mulbsta",
      "formula_expression": "MuLBSTA = multilobular_infiltrates 5 + lymphocyte_k_ul<=0.8 4 + bacterial_coinfection 4 + smoking (never 0, former 2, current 3; exclusive) + hypertension 2 + age>=60 2; Guo 2019; max 20; low 0-11, high >=12",
      "max_score": 20,
      "score": 0,
      "age_years": 50,
      "lymphocyte_k_ul": 1.5,
      "mulbsta_band": "low",
      "smoking": "never"
    },
    {
      "components": [
        {
          "factor": "multilobular_infiltrates",
          "points": 0,
          "present": false
        },
        {
          "value": 1.5,
          "factor": "lymphocyte_le_0_8",
          "points": 0,
          "present": false
        },
        {
          "factor": "bacterial_coinfection",
          "points": 0,
          "present": false
        },
        {
          "value": "never",
          "factor": "smoking",
          "points": 0,
          "present": false
        },
        {
          "factor": "hypertension",
          "points": 0,
          "present": false
        },
        {
          "value": 50,
          "factor": "age_ge_60",
          "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": "Guo L, Wei D, Zhang X, Wu Y, Li Q, Zhou M, Qu J",
        "doi": "10.3389/fmicb.2019.02752",
        "id": "guo-2019",
        "pmid": "31849894",
        "source": "Front Microbiol. 2019;10:2752",
        "title": "Clinical Features Predicting Mortality Risk in Patients With Viral Pneumonia: The MuLBSTA Score"
      },
      "formula": "mulbsta",
      "formula_expression": "MuLBSTA = multilobular_infiltrates 5 + lymphocyte_k_ul<=0.8 4 + bacterial_coinfection 4 + smoking (never 0, former 2, current 3; exclusive) + hypertension 2 + age>=60 2; Guo 2019; max 20; low 0-11, high >=12",
      "max_score": 20,
      "score": 0,
      "age_years": 50,
      "lymphocyte_k_ul": 1.5,
      "mulbsta_band": "low",
      "smoking": "never"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	mulbsta
`formula_expression`	string	Exact expression used
`score`	integer	MuLBSTA points 0-20
`max_score`	integer	Always 20
`mulbsta_band`	string	Guo 2019 band: low (score 0-11; paper mortality 5.07%) or high (score ≥12; paper 33.92%). Not a treatment order.
`age_years`	integer	Age used for the ≥60 criterion
`smoking`	string	Exclusive smoking status used: never, former, or current
`lymphocyte_k_ul`	number	Absolute lymphocyte count ×10^9/L used for the ≤0.8 criterion
`components`	array	Per-factor points
`citation`	object	Guo et al. Front Microbiol 2019 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "multilobular_infiltrates",
      "points": 0,
      "present": false
    },
    {
      "value": 1.5,
      "factor": "lymphocyte_le_0_8",
      "points": 0,
      "present": false
    },
    {
      "factor": "bacterial_coinfection",
      "points": 0,
      "present": false
    },
    {
      "value": "never",
      "factor": "smoking",
      "points": 0,
      "present": false
    },
    {
      "factor": "hypertension",
      "points": 0,
      "present": false
    },
    {
      "value": 50,
      "factor": "age_ge_60",
      "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": "Guo L, Wei D, Zhang X, Wu Y, Li Q, Zhou M, Qu J",
    "doi": "10.3389/fmicb.2019.02752",
    "id": "guo-2019",
    "pmid": "31849894",
    "source": "Front Microbiol. 2019;10:2752",
    "title": "Clinical Features Predicting Mortality Risk in Patients With Viral Pneumonia: The MuLBSTA Score"
  },
  "formula": "mulbsta",
  "formula_expression": "MuLBSTA = multilobular_infiltrates 5 + lymphocyte_k_ul<=0.8 4 + bacterial_coinfection 4 + smoking (never 0, former 2, current 3; exclusive) + hypertension 2 + age>=60 2; Guo 2019; max 20; low 0-11, high >=12",
  "max_score": 20,
  "score": 0,
  "age_years": 50,
  "lymphocyte_k_ul": 1.5,
  "mulbsta_band": "low",
  "smoking": "never"
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_age`	age must be an integer from 18 to 120 Returned before settlement; you are not charged.
400	`invalid_mulbsta_smoking`	smoking must be never, former, or current (Guo 2019 MuLBSTA; current and former are mutually exclusive). Returned before settlement; you are not charged.
400	`invalid_lymphocyte_count`	lymphocyte_k_ul must be a number from 0.05 to 20 (absolute lymphocyte count ×10^9/L). Returned before settlement; you are not charged.
400	`invalid_flag`	boolean clinical flags must be true or false 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

CURB-65 — Compute the CURB-65 community-acquired pneumonia severity score from age and discrete flags.
CRB-65 — Compute the Lim 2003 CRB-65 community-acquired pneumonia score from age and caller-assigned confusion, respiratory-rate, and blood-pressure flags. Urea is not an input.
PSI / PORT — Compute the Fine 1997 Pneumonia Severity Index (PORT) two-step risk class and Table 2 point total for community-acquired pneumonia.

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.