Hematology · LIVE

Glasgow Prognostic Score (GPS)

GPS

Apply the Forrest 2003 original Glasgow Prognostic Score (GPS) from caller-supplied CRP in mg/L and albumin.

LIVE $0.005 USDC GET /api/calc/gps

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

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

What it computes

Apply the Forrest 2003 original Glasgow Prognostic Score (GPS) from caller-supplied CRP in mg/L and albumin.

When to use

When an agent has CRP in mg/L and albumin and needs the published Forrest 2003 original GPS (0–2), not mGPS, not hs-mGPS, and not a cancer diagnosis or treatment order.

When not to use

Not a medical device. magent does not examine the patient and does not assay CRP or albumin.
This is Forrest 2003 original GPS only. Isolated hypoalbuminaemia scores 1. It is not mGPS (which scores hypoalbuminaemia alone as 0) and not hs-mGPS.
Not a cancer diagnosis or treatment order. Does not return survival months or percents.

Formula

GPS 0: CRP ≤ 10 mg/L AND albumin ≥ 35 g/L; GPS 1: CRP ≤ 10 mg/L AND albumin < 35 g/L (isolated hypoalbuminaemia) OR CRP > 10 mg/L AND albumin ≥ 35 g/L; GPS 2: CRP > 10 mg/L AND albumin < 35 g/L (Forrest 2003 original GPS)

Citation

Title: Evaluation of cumulative prognostic scores based on the systemic inflammatory response in patients with inoperable non-small-cell lung cancer
Authors: Forrest LM, McMillan DC, McArdle CS, Angerson WJ, Dunlop DJ
Source: Br J Cancer. 2003;89(6):1028-1030
DOI: 10.1038/sj.bjc.6601242

Worked example

CRP 5 mg/L, albumin 40 g/L

Given: albumin_g_l=40crp_mg_l=5

CRP 5 mg/L is ≤ 10 (not elevated) and albumin 40 g/L is ≥ 35 (not low)
GPS 0

CRP 5 mg/L, albumin 30 g/L

Given: albumin_g_l=30crp_mg_l=5

CRP 5 mg/L is ≤ 10 and albumin 30 g/L is < 35
GPS 1 (isolated hypoalbuminaemia; mGPS would score 0)

Also searched as

GPS
Glasgow Prognostic Score
original GPS
Forrest GPS
Forrest 2003 GPS
CRP albumin GPS
systemic inflammatory response GPS
cumulative prognostic score GPS

Try

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

/api/calc/gps?crp_mg_l=5&albumin_g_l=40

Full URL: https://api.magentlab.com/api/calc/gps?crp_mg_l=5&albumin_g_l=40

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/gps?crp_mg_l=5&albumin_g_l=40"

Parameters

Name	Type	Required	Description
`crp_mg_l`	number	required	C-reactive protein in mg/L (0-500), not mg/dL. Forrest 2003 elevated CRP is >10 mg/L. CRP = 10 is not elevated. magent does not assay CRP.
`albumin_g_l`	number	optional	Serum albumin in g/L (10-60). Provide this or albumin_g_dl, not both. Forrest 2003 hypoalbuminaemia is <35 g/L (35 is not low). Isolated hypoalbuminaemia scores GPS 1. magent does not assay albumin.
`albumin_g_dl`	number	optional	Serum albumin in g/dL (1-6). Converted as g/L = g/dL × 10. Provide this or albumin_g_l, not both.

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/gps 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": [
    {
      "albumin_g_l": "40",
      "crp_mg_l": "5"
    },
    {
      "albumin_g_l": "40",
      "crp_mg_l": "5"
    }
  ]
}

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/gps",
  "items": [
    {
      "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": "Forrest LM, McMillan DC, McArdle CS, Angerson WJ, Dunlop DJ",
        "doi": "10.1038/sj.bjc.6601242",
        "id": "forrest-2003",
        "pmid": "12966420",
        "source": "Br J Cancer. 2003;89(6):1028-1030",
        "title": "Evaluation of cumulative prognostic scores based on the systemic inflammatory response in patients with inoperable non-small-cell lung cancer"
      },
      "formula": "gps",
      "formula_expression": "GPS 0: CRP ≤ 10 mg/L AND albumin ≥ 35 g/L; GPS 1: CRP ≤ 10 mg/L AND albumin < 35 g/L (isolated hypoalbuminaemia) OR CRP > 10 mg/L AND albumin ≥ 35 g/L; GPS 2: CRP > 10 mg/L AND albumin < 35 g/L (Forrest 2003 original GPS)",
      "albumin_g_l": 40.0,
      "crp_mg_l": 5.0,
      "gps": 0
    },
    {
      "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": "Forrest LM, McMillan DC, McArdle CS, Angerson WJ, Dunlop DJ",
        "doi": "10.1038/sj.bjc.6601242",
        "id": "forrest-2003",
        "pmid": "12966420",
        "source": "Br J Cancer. 2003;89(6):1028-1030",
        "title": "Evaluation of cumulative prognostic scores based on the systemic inflammatory response in patients with inoperable non-small-cell lung cancer"
      },
      "formula": "gps",
      "formula_expression": "GPS 0: CRP ≤ 10 mg/L AND albumin ≥ 35 g/L; GPS 1: CRP ≤ 10 mg/L AND albumin < 35 g/L (isolated hypoalbuminaemia) OR CRP > 10 mg/L AND albumin ≥ 35 g/L; GPS 2: CRP > 10 mg/L AND albumin < 35 g/L (Forrest 2003 original GPS)",
      "albumin_g_l": 40.0,
      "crp_mg_l": 5.0,
      "gps": 0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	gps
`formula_expression`	string	Forrest 2003 original GPS 0 / 1 / 2 rules in paper units (mg/L and g/L)
`crp_mg_l`	number	C-reactive protein used in mg/L
`albumin_g_l`	number	Serum albumin used in g/L (after g/dL conversion when supplied)
`gps`	integer	0, 1, or 2 (Forrest 2003 original GPS). Isolated hypoalbuminaemia is 1. Not mGPS.
`citation`	object	Forrest 2003 Br J Cancer citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "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": "Forrest LM, McMillan DC, McArdle CS, Angerson WJ, Dunlop DJ",
    "doi": "10.1038/sj.bjc.6601242",
    "id": "forrest-2003",
    "pmid": "12966420",
    "source": "Br J Cancer. 2003;89(6):1028-1030",
    "title": "Evaluation of cumulative prognostic scores based on the systemic inflammatory response in patients with inoperable non-small-cell lung cancer"
  },
  "formula": "gps",
  "formula_expression": "GPS 0: CRP ≤ 10 mg/L AND albumin ≥ 35 g/L; GPS 1: CRP ≤ 10 mg/L AND albumin < 35 g/L (isolated hypoalbuminaemia) OR CRP > 10 mg/L AND albumin ≥ 35 g/L; GPS 2: CRP > 10 mg/L AND albumin < 35 g/L (Forrest 2003 original GPS)",
  "albumin_g_l": 40.0,
  "crp_mg_l": 5.0,
  "gps": 0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_crp`	crp_mg_l must be a number from 0 to 500. Returned before settlement; you are not charged.
400	`invalid_albumin`	albumin_g_dl (1-6) or albumin_g_l (10-60) is required 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

mGPS — Apply the McMillan 2007 modified Glasgow Prognostic Score (mGPS) from caller-supplied CRP in mg/L and albumin.

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.
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.