# Utah COVID score (Webb)

Utah COVID score

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/utrs`
HTML: https://magentlab.com/docs/utah-covid
Markdown: https://magentlab.com/docs/utah-covid.md

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

## What it computes

Sum the Webb 2022 Table 6 simplified clinical prediction score from the printed age-decade lookup, caller-assigned community of color, and comorbidity and dyspnea flags, and return whether the total is at or above the Table 7 Youden threshold of 6.

## When to use

When an agent already has age, sex, caller-assigned community of color, dyspnea, and the Table 6 comorbidity flags and needs the published point total for 14-day hospitalization and 28-day mortality risk stratification, not a treatment-allocation order.

## When not to use

- Not a medical device.
- Not a diagnosis or treatment-allocation order. magent does not prescribe therapy or decide hospitalization. Table 7 Youden ≥6 is a published discrimination threshold, not later Utah Crisis Standards of Care allocation cutoffs.
- community_of_color is caller-assigned from the paper's community of color / non-white race or Hispanic/Latinx ethnicity. magent does not assign race or ethnicity.
- Derivation used consecutive adults with positive SARS-CoV-2 PCR in ambulatory and emergency settings (mean age 40). Table 6 still prints 0-10 and 11-20 decades; magent encodes that lookup and does not examine the patient.
- Obesity is the Methods BMI ≥30 flag (Table 6 label BMI>30). Severe immunocompromise follows Table 6 footnote 2; Methods also list additional immunosuppressive therapies. magent does not adjudicate those diagnoses.

## Formula

```
Webb 2022 Table 6: age 0-10=0.5, 11-20=1, 21-30=1.5, 31-40=2, 41-50=2.5, 51-60=3, 61-70=3.5, 71-80=4, 81-90=4.5, 91-100=5, >100=5.5 (printed decade lookup, not floor(age/10)*0.5); diabetes, severe immunocompromise, obesity (Methods BMI ≥30; Table 6 label BMI>30), community of color 2 each; male sex, dyspnea, hypertension, CAD, cardiac arrhythmia, CHF, CKD, chronic pulmonary disease, chronic liver disease, cerebrovascular disease, chronic neurologic disease 1 each; max 24.5; score_ge_6 iff score ≥6 (Table 7 Youden)
```

## Citation

[Simple scoring tool to estimate risk of hospitalization and mortality in ambulatory and emergency department patients with COVID-19](https://doi.org/10.1371/journal.pone.0261508)
Webb BJ, Levin NM, Grisel N, Brown SM, Peltan ID, Spivak ES, et al.
PLoS One. 2022;17(3):e0261508
DOI: [10.1371/journal.pone.0261508](https://doi.org/10.1371/journal.pone.0261508)

## Worked example

### Adult 31-40 years, female, no flags (Table 6 age 2.0)

Given: `age=35, cardiac_arrhythmia=false, cerebrovascular_disease=false, chronic_kidney_disease=false, chronic_liver_disease=false, chronic_neurologic_disease=false, chronic_pulmonary_disease=false, community_of_color=false, congestive_heart_failure=false, coronary_artery_disease=false, diabetes=false, dyspnea=false, hypertension=false, obesity=false, severe_immunocompromise=false, sex=female`

1. Age 35 is Table 6 band 31-40 → 2.0
2. Female → 0; community_of_color false → 0
3. Diabetes, severe immunocompromise, obesity, dyspnea, and remaining 1-point comorbidities false → 0
4. Score = 2.0 (max 24.5); score_ge_6 = false (Table 7 Youden is ≥6)


### Table 7 Youden neighborhood: age 91-100, male (score 6)

Given: `age=95, cardiac_arrhythmia=false, cerebrovascular_disease=false, chronic_kidney_disease=false, chronic_liver_disease=false, chronic_neurologic_disease=false, chronic_pulmonary_disease=false, community_of_color=false, congestive_heart_failure=false, coronary_artery_disease=false, diabetes=false, dyspnea=false, hypertension=false, obesity=false, severe_immunocompromise=false, sex=male`

1. Age 95 is Table 6 band 91-100 → 5.0
2. Male → 1; all other flags false → 0
3. Score = 6.0; score_ge_6 = true


## Also searched as

- Utah COVID score
- Webb 2022 COVID score
- Intermountain COVID prediction score
- simplified clinical prediction score
- Webb hospitalization mortality score
- Utah COVID-19 score
- Table 6 Webb score

## Parameters

- `age` (integer, required): Age in whole years (0-120). Webb 2022 Table 6 decade lookup: 0-10=0.5, 11-20=1, 21-30=1.5, 31-40=2, 41-50=2.5, 51-60=3, 61-70=3.5, 71-80=4, 81-90=4.5, 91-100=5, >100=5.5. Not floor(age/10)×0.5.
- `sex` (string, required): Sex as recorded. Male scores 1 (Webb 2022 Table 6). female or male.
- `community_of_color` (boolean, required): Caller-assigned: the paper's community of color (self-identifies as non-white race or Hispanic/Latinx ethnicity). 2 points if true. magent does not assign race or ethnicity. true or false.
- `diabetes` (boolean, required): Diabetes mellitus (Webb 2022 Table 6 high-risk comorbidity). 2 points if true. true or false.
- `severe_immunocompromise` (boolean, required): Severe immunocompromise as Table 6 footnote 2: solid organ or bone marrow transplant, AIDS, active chemotherapy, or inherited immunodeficiency. 2 points if true. Caller-assigned; magent does not adjudicate. true or false.
- `obesity` (boolean, required): Obesity as BMI ≥30 kg/m² (Webb 2022 Methods; Table 6 label BMI>30). 2 points if true. Caller-assigned true or false.
- `dyspnea` (boolean, required): Dyspnea at the time of testing (Webb 2022 Table 6 symptom). 1 point if true. true or false.
- `hypertension` (boolean, required): Hypertension (Webb 2022 Table 6). 1 point if true. true or false.
- `coronary_artery_disease` (boolean, required): Coronary artery disease (Webb 2022 Table 6). 1 point if true. true or false.
- `cardiac_arrhythmia` (boolean, required): Cardiac arrhythmia (Webb 2022 Table 6). 1 point if true. true or false.
- `congestive_heart_failure` (boolean, required): Congestive heart failure (Webb 2022 Table 6). 1 point if true. true or false.
- `chronic_kidney_disease` (boolean, required): Chronic kidney disease (Webb 2022 Table 6). 1 point if true. true or false.
- `chronic_pulmonary_disease` (boolean, required): Chronic pulmonary disease (Webb 2022 Table 6). 1 point if true. true or false.
- `chronic_liver_disease` (boolean, required): Chronic liver disease (Webb 2022 Table 6). 1 point if true. true or false.
- `cerebrovascular_disease` (boolean, required): Cerebrovascular disease (Webb 2022 Table 6). 1 point if true. true or false.
- `chronic_neurologic_disease` (boolean, required): Chronic neurologic disease (Webb 2022 Table 6). 1 point if true. true or false.

## 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.

Method: `POST /api/calc/utrs`
Max items: 25
Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic)
Status: 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:

```json
{
  "items": [
    {
      "age": "35",
      "cardiac_arrhythmia": "false",
      "cerebrovascular_disease": "false",
      "chronic_kidney_disease": "false",
      "chronic_liver_disease": "false",
      "chronic_neurologic_disease": "false",
      "chronic_pulmonary_disease": "false",
      "community_of_color": "false",
      "congestive_heart_failure": "false",
      "coronary_artery_disease": "false",
      "diabetes": "false",
      "dyspnea": "false",
      "hypertension": "false",
      "obesity": "false",
      "severe_immunocompromise": "false",
      "sex": "female"
    },
    {
      "age": "35",
      "cardiac_arrhythmia": "false",
      "cerebrovascular_disease": "false",
      "chronic_kidney_disease": "false",
      "chronic_liver_disease": "false",
      "chronic_neurologic_disease": "false",
      "chronic_pulmonary_disease": "false",
      "community_of_color": "false",
      "congestive_heart_failure": "false",
      "coronary_artery_disease": "false",
      "diabetes": "false",
      "dyspnea": "false",
      "hypertension": "false",
      "obesity": "false",
      "severe_immunocompromise": "false",
      "sex": "female"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/utah-covid

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/utrs",
  "items": [
    {
      "components": [
        {
          "factor": "male",
          "points": 0,
          "present": false
        },
        {
          "value": 35,
          "factor": "age",
          "points": 2.0,
          "present": true
        },
        {
          "factor": "community_of_color",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "severe_immunocompromise",
          "points": 0,
          "present": false
        },
        {
          "factor": "obesity",
          "points": 0,
          "present": false
        },
        {
          "factor": "hypertension",
          "points": 0,
          "present": false
        },
        {
          "factor": "coronary_artery_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "cardiac_arrhythmia",
          "points": 0,
          "present": false
        },
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "chronic_kidney_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "chronic_pulmonary_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "chronic_liver_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "cerebrovascular_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "chronic_neurologic_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "dyspnea",
          "points": 0,
          "present": false
        }
      ],
      "age": 35,
      "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": "Webb BJ, Levin NM, Grisel N, Brown SM, Peltan ID, Spivak ES, et al.",
        "doi": "10.1371/journal.pone.0261508",
        "id": "webb-2022-utah-covid",
        "pmid": "35239664",
        "source": "PLoS One. 2022;17(3):e0261508",
        "title": "Simple scoring tool to estimate risk of hospitalization and mortality in ambulatory and emergency department patients with COVID-19"
      },
      "formula": "utah-covid",
      "formula_expression": "Webb 2022 Table 6: age 0-10=0.5, 11-20=1, 21-30=1.5, 31-40=2, 41-50=2.5, 51-60=3, 61-70=3.5, 71-80=4, 81-90=4.5, 91-100=5, >100=5.5 (printed decade lookup, not floor(age/10)*0.5); diabetes, severe immunocompromise, obesity (Methods BMI ≥30; Table 6 label BMI>30), community of color 2 each; male sex, dyspnea, hypertension, CAD, cardiac arrhythmia, CHF, CKD, chronic pulmonary disease, chronic liver disease, cerebrovascular disease, chronic neurologic disease 1 each; max 24.5; score_ge_6 iff score ≥6 (Table 7 Youden)",
      "max_score": 24.5,
      "score": 2.0,
      "sex": "female",
      "cutpoint": 6,
      "score_ge_6": false
    },
    {
      "components": [
        {
          "factor": "male",
          "points": 0,
          "present": false
        },
        {
          "value": 35,
          "factor": "age",
          "points": 2.0,
          "present": true
        },
        {
          "factor": "community_of_color",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "severe_immunocompromise",
          "points": 0,
          "present": false
        },
        {
          "factor": "obesity",
          "points": 0,
          "present": false
        },
        {
          "factor": "hypertension",
          "points": 0,
          "present": false
        },
        {
          "factor": "coronary_artery_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "cardiac_arrhythmia",
          "points": 0,
          "present": false
        },
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "chronic_kidney_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "chronic_pulmonary_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "chronic_liver_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "cerebrovascular_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "chronic_neurologic_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "dyspnea",
          "points": 0,
          "present": false
        }
      ],
      "age": 35,
      "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": "Webb BJ, Levin NM, Grisel N, Brown SM, Peltan ID, Spivak ES, et al.",
        "doi": "10.1371/journal.pone.0261508",
        "id": "webb-2022-utah-covid",
        "pmid": "35239664",
        "source": "PLoS One. 2022;17(3):e0261508",
        "title": "Simple scoring tool to estimate risk of hospitalization and mortality in ambulatory and emergency department patients with COVID-19"
      },
      "formula": "utah-covid",
      "formula_expression": "Webb 2022 Table 6: age 0-10=0.5, 11-20=1, 21-30=1.5, 31-40=2, 41-50=2.5, 51-60=3, 61-70=3.5, 71-80=4, 81-90=4.5, 91-100=5, >100=5.5 (printed decade lookup, not floor(age/10)*0.5); diabetes, severe immunocompromise, obesity (Methods BMI ≥30; Table 6 label BMI>30), community of color 2 each; male sex, dyspnea, hypertension, CAD, cardiac arrhythmia, CHF, CKD, chronic pulmonary disease, chronic liver disease, cerebrovascular disease, chronic neurologic disease 1 each; max 24.5; score_ge_6 iff score ≥6 (Table 7 Youden)",
      "max_score": 24.5,
      "score": 2.0,
      "sex": "female",
      "cutpoint": 6,
      "score_ge_6": false
    }
  ]
}
```

## Response fields

- `formula` (string): utah-covid
- `formula_expression` (string): Exact expression used
- `score` (number): Webb 2022 Table 6 points 0-24.5
- `max_score` (number): 24.5
- `cutpoint` (integer): Table 7 Youden threshold 6 (sensitivity 71.1%, specificity 76.2%)
- `score_ge_6` (boolean): true iff score ≥6 (Webb 2022 Table 7 Youden). Not a treatment-allocation order.
- `age` (integer): Age used, years
- `sex` (string): female or male used
- `components` (array): Per-factor points
- `citation` (object): Webb et al. PLoS One 2022 citation
- `disclaimer` (string): Not-a-device notice

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "components": [
    {
      "factor": "male",
      "points": 0,
      "present": false
    },
    {
      "value": 35,
      "factor": "age",
      "points": 2.0,
      "present": true
    },
    {
      "factor": "community_of_color",
      "points": 0,
      "present": false
    },
    {
      "factor": "diabetes",
      "points": 0,
      "present": false
    },
    {
      "factor": "severe_immunocompromise",
      "points": 0,
      "present": false
    },
    {
      "factor": "obesity",
      "points": 0,
      "present": false
    },
    {
      "factor": "hypertension",
      "points": 0,
      "present": false
    },
    {
      "factor": "coronary_artery_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "cardiac_arrhythmia",
      "points": 0,
      "present": false
    },
    {
      "factor": "congestive_heart_failure",
      "points": 0,
      "present": false
    },
    {
      "factor": "chronic_kidney_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "chronic_pulmonary_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "chronic_liver_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "cerebrovascular_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "chronic_neurologic_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "dyspnea",
      "points": 0,
      "present": false
    }
  ],
  "age": 35,
  "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": "Webb BJ, Levin NM, Grisel N, Brown SM, Peltan ID, Spivak ES, et al.",
    "doi": "10.1371/journal.pone.0261508",
    "id": "webb-2022-utah-covid",
    "pmid": "35239664",
    "source": "PLoS One. 2022;17(3):e0261508",
    "title": "Simple scoring tool to estimate risk of hospitalization and mortality in ambulatory and emergency department patients with COVID-19"
  },
  "formula": "utah-covid",
  "formula_expression": "Webb 2022 Table 6: age 0-10=0.5, 11-20=1, 21-30=1.5, 31-40=2, 41-50=2.5, 51-60=3, 61-70=3.5, 71-80=4, 81-90=4.5, 91-100=5, >100=5.5 (printed decade lookup, not floor(age/10)*0.5); diabetes, severe immunocompromise, obesity (Methods BMI ≥30; Table 6 label BMI>30), community of color 2 each; male sex, dyspnea, hypertension, CAD, cardiac arrhythmia, CHF, CKD, chronic pulmonary disease, chronic liver disease, cerebrovascular disease, chronic neurologic disease 1 each; max 24.5; score_ge_6 iff score ≥6 (Table 7 Youden)",
  "max_score": 24.5,
  "score": 2.0,
  "sex": "female",
  "cutpoint": 6,
  "score_ge_6": false
}
```

## Errors

- HTTP 400 `invalid_utah_covid`: Utah COVID score inputs must match Webb 2022 Table 6 age, sex, caller-assigned community of color, dyspnea, and comorbidity flags. Returned before settlement; you are not charged.
- HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
- HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
- HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged.

Shared HTTP 402 and 503: https://magentlab.com/docs/payments

## Related tools

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- [PRIEST](https://magentlab.com/docs/priest) — Sum the Goodacre 2021 PRIEST points from NEWS2 Chart 1 Scale 1 vitals, alertness, inspired oxygen, age, sex, and performance status, and return whether the total is ≤4.
- [CHOSEN](https://magentlab.com/docs/chosen) — Sum the Levine 2020 CHOSEN (COVID Home Safely Now) Figure 2 points from age, oxygen saturation, and serum albumin in g/dL, and return whether the total is at or above the printed cutpoint of 30.

## 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.

- GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall).
- HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote.
- Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering.
- Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional.
- Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402.

- offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront.
- offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization.

- not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search.

Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers).

Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments

Stdio MCP (one process per host): https://magentlab.com/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.