Infection / VTE · LIVE

Menza HIV acquisition score

Menza

Sum the four Menza 2009 caller-assigned flags and return the 0–19 point total.

LIVE $0.005 USDC GET /api/calc/menza

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

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

What it computes

Sum the four Menza 2009 caller-assigned flags and return the 0–19 point total.

When to use

When an agent has already assigned the four Menza 2009 flags and needs the published point total. magent does not take a sexual history and does not diagnose HIV, order PrEP, or run a test-and-treat protocol.

When not to use

Not a medical device.
Not a diagnosis of HIV infection.
Not a PrEP order and not a test-and-treat protocol.
magent does not take a sexual history. Each flag is caller-assigned.
This is Menza 2009 only. Not HIRI-MSM and not SexPro.
Menza 2009 did not publish named low/high strata or PrEP cutoffs; magent returns the integer score only.

Formula

Menza = meth_or_poppers_6mo (true 11) + bacterial_sti (true 4) + partners_ge_10_year (true 3) + uai_positive_or_unknown_year (true 1); Menza 2009; max 19

Citation

Title: Prediction of HIV acquisition among men who have sex with men
Authors: Menza TW, Hughes JP, Celum CL, Golden MR
Source: Sex Transm Dis. 2009;36(9):547-555
DOI: 10.1097/OLQ.0b013e3181a9cc41

Worked example

All four flags false

Given: bacterial_sti=falsemeth_or_poppers_6mo=falsepartners_ge_10_year=falseuai_positive_or_unknown_year=false

meth_or_poppers_6mo false → 0; bacterial_sti false → 0; partners_ge_10_year false → 0; uai_positive_or_unknown_year false → 0
Score = 0 (max 19)

All four flags true

Given: bacterial_sti=truemeth_or_poppers_6mo=truepartners_ge_10_year=trueuai_positive_or_unknown_year=true

meth_or_poppers_6mo true → 11; bacterial_sti true → 4; partners_ge_10_year true → 3; uai_positive_or_unknown_year true → 1
Score = 19 (max 19)

Also searched as

Menza score
Menza 2009
HIV acquisition MSM
MSM HIV risk score
methamphetamine poppers STI
Menza HIV prediction
ten or more male partners HIV

Try

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

/api/calc/menza?meth_or_poppers_6mo=false&bacterial_sti=false&partners_ge_10_year=false&uai_positive_or_unknown_year=false

Full URL: https://api.magentlab.com/api/calc/menza?meth_or_poppers_6mo=false&bacterial_sti=false&partners_ge_10_year=false&uai_positive_or_unknown_year=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/menza?meth_or_poppers_6mo=false&bacterial_sti=false&partners_ge_10_year=false&uai_positive_or_unknown_year=false"

Parameters

Name	Type	Required	Description
`meth_or_poppers_6mo`	boolean	required	Methamphetamine or inhaled nitrites (poppers) in the prior 6 months as assigned by the caller (Menza 2009). true scores 11. magent does not take a sexual history.
`bacterial_sti`	boolean	required	Current diagnosis or history of bacterial STI (Menza 2009: gonorrhea, chlamydia, or syphilis) as assigned by the caller. true scores 4. magent does not take a sexual history.
`partners_ge_10_year`	boolean	required	Ten or more male sex partners in the prior year as assigned by the caller (Menza 2009). true scores 3. magent does not take a sexual history.
`uai_positive_or_unknown_year`	boolean	required	Unprotected anal intercourse with a partner of positive or unknown HIV status in the prior year as assigned by the caller (Menza 2009). true scores 1. magent does not take a sexual history.

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/menza 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": [
    {
      "bacterial_sti": "false",
      "meth_or_poppers_6mo": "false",
      "partners_ge_10_year": "false",
      "uai_positive_or_unknown_year": "false"
    },
    {
      "bacterial_sti": "false",
      "meth_or_poppers_6mo": "false",
      "partners_ge_10_year": "false",
      "uai_positive_or_unknown_year": "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/menza",
  "items": [
    {
      "components": [
        {
          "factor": "meth_or_poppers_6mo",
          "points": 0,
          "present": false
        },
        {
          "factor": "bacterial_sti",
          "points": 0,
          "present": false
        },
        {
          "factor": "partners_ge_10_year",
          "points": 0,
          "present": false
        },
        {
          "factor": "uai_positive_or_unknown_year",
          "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": "Menza TW, Hughes JP, Celum CL, Golden MR",
        "doi": "10.1097/OLQ.0b013e3181a9cc41",
        "id": "menza-2009",
        "pmid": "19707108",
        "source": "Sex Transm Dis. 2009;36(9):547-555",
        "title": "Prediction of HIV acquisition among men who have sex with men"
      },
      "formula": "menza",
      "formula_expression": "Menza = meth_or_poppers_6mo (true 11) + bacterial_sti (true 4) + partners_ge_10_year (true 3) + uai_positive_or_unknown_year (true 1); Menza 2009; max 19",
      "max_score": 19,
      "score": 0
    },
    {
      "components": [
        {
          "factor": "meth_or_poppers_6mo",
          "points": 0,
          "present": false
        },
        {
          "factor": "bacterial_sti",
          "points": 0,
          "present": false
        },
        {
          "factor": "partners_ge_10_year",
          "points": 0,
          "present": false
        },
        {
          "factor": "uai_positive_or_unknown_year",
          "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": "Menza TW, Hughes JP, Celum CL, Golden MR",
        "doi": "10.1097/OLQ.0b013e3181a9cc41",
        "id": "menza-2009",
        "pmid": "19707108",
        "source": "Sex Transm Dis. 2009;36(9):547-555",
        "title": "Prediction of HIV acquisition among men who have sex with men"
      },
      "formula": "menza",
      "formula_expression": "Menza = meth_or_poppers_6mo (true 11) + bacterial_sti (true 4) + partners_ge_10_year (true 3) + uai_positive_or_unknown_year (true 1); Menza 2009; max 19",
      "max_score": 19,
      "score": 0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	menza
`formula_expression`	string	Exact expression used
`score`	integer	Menza 2009 points 0-19
`max_score`	integer	19
`components`	array	Per-flag points
`citation`	object	Menza et al. Sex Transm Dis 2009 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "meth_or_poppers_6mo",
      "points": 0,
      "present": false
    },
    {
      "factor": "bacterial_sti",
      "points": 0,
      "present": false
    },
    {
      "factor": "partners_ge_10_year",
      "points": 0,
      "present": false
    },
    {
      "factor": "uai_positive_or_unknown_year",
      "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": "Menza TW, Hughes JP, Celum CL, Golden MR",
    "doi": "10.1097/OLQ.0b013e3181a9cc41",
    "id": "menza-2009",
    "pmid": "19707108",
    "source": "Sex Transm Dis. 2009;36(9):547-555",
    "title": "Prediction of HIV acquisition among men who have sex with men"
  },
  "formula": "menza",
  "formula_expression": "Menza = meth_or_poppers_6mo (true 11) + bacterial_sti (true 4) + partners_ge_10_year (true 3) + uai_positive_or_unknown_year (true 1); Menza 2009; max 19",
  "max_score": 19,
  "score": 0
}

Client errors (HTTP 400)

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

HTTP	Code	When
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

HIRI-MSM — Sum the published Smith 2012 seven-item HIV incidence risk index for MSM (age plus six prior-6-month behaviors, 0–47) and return at_or_above_10 when the total is ≥10.
CAGE — Sum the four Ewing 1984 CAGE items and return whether two or more answers are affirmative.

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.