NRS-2002 nutritional risk screening

NRS-2002

Sum Kondrup 2003 NRS-2002 impaired nutritional status (0–3), disease severity (0–3), and 1 if age ≥70, and return whether the total is at nutritional risk (score ≥3).

LIVE $0.005 USDC GET /api/calc/nrs_2002

Markdown: /docs/nrs-2002.md · Canonical: https://magentlab.com/docs/nrs-2002

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

What it computes

Sum Kondrup 2003 NRS-2002 impaired nutritional status (0–3), disease severity (0–3), and 1 if age ≥70, and return whether the total is at nutritional risk (score ≥3).

When to use

When an agent has caller-assigned Kondrup 2003 nutrition and severity grades and needs the published NRS-2002 total and at-risk flag, not a diet order, not NRI, and without recomputing BMI or weight-loss arithmetic.

When not to use

Not a medical device.
Not a diet order. magent does not weigh the patient and does not compute BMI, percent weight loss, or food intake from measurements.
Kondrup 2003 NRS-2002 for hospitalized adults. at_risk is true iff score ≥ 3. No other bands are returned.
This is not NRI (Nutritional Risk Index).

Formula

NRS-2002 = nutrition_status (0–3) + disease_severity (0–3) + 1 if age ≥ 70; max 7; at_risk if score ≥ 3

Citation

Title: Nutritional risk screening (NRS 2002): a new method based on an analysis of controlled clinical trials
Authors: Kondrup J, Rasmussen HH, Hamberg O, Stanga Z, Ad Hoc ESPEN Working Group
Source: Clin Nutr. 2003;22(3):321-336
DOI: 10.1016/s0261-5614(02)00214-5

Worked example

No impairment, age 50

Given: age=50disease_severity=0nutrition_status=0

nutrition_status 0 + disease_severity 0 + age 50 is not ≥70 → 0
Score = 0 (max 7); at_risk false

Mild nutrition, mild severity, age 70

Given: age=70disease_severity=1nutrition_status=1

nutrition_status 1 + disease_severity 1 + age ≥70 → 1
Score = 3 (max 7); at_risk true

Also searched as

NRS-2002
NRS 2002
Nutritional risk screening
Kondrup NRS
ESPEN NRS-2002
nutrition risk screening 2002
NRS2002

Try

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

/api/calc/nrs_2002?nutrition_status=0&disease_severity=0&age=50

Full URL: https://api.magentlab.com/api/calc/nrs_2002?nutrition_status=0&disease_severity=0&age=50

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/nrs_2002?nutrition_status=0&disease_severity=0&age=50"

Parameters

Name	Type	Required	Description
`nutrition_status`	integer	required · 0, 1, 2, 3	Caller-assigned Kondrup 2003 impaired nutritional status 0-3. If BMI, intake, and weight-loss grades differ, use the highest. 0 absent. 1 mild (weight loss >5% in 3 months or food intake 50-75% of requirement last week). 2 moderate (weight loss >5% in 2 months or BMI 18.5-20.5 plus impaired general condition or intake 25-60%). 3 severe (weight loss >5% in 1 month / >15% in 3 months or BMI <18.5 plus impaired general condition or intake 0-25%). magent does not weigh the patient or compute BMI, weight-loss, or intake.
`disease_severity`	integer	required · 0, 1, 2, 3	Caller-assigned Kondrup 2003 disease severity 0-3. 0 absent (normal requirements). 1 mild (e.g. hip fracture; chronic illness with complications: cirrhosis, COPD, chronic hemodialysis, diabetes, oncology). 2 moderate (e.g. major abdominal surgery, stroke, severe pneumonia, hematologic malignancy). 3 severe (e.g. head injury, bone marrow transplant, ICU APACHE >10). magent does not assign the diagnosis.
`age`	integer	required	Age in years (18-120). Kondrup 2003: add 1 point when age ≥70. Age 70 scores. Age 69 does not.

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/nrs_2002 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",
      "disease_severity": "0",
      "nutrition_status": "0"
    },
    {
      "age": "50",
      "disease_severity": "0",
      "nutrition_status": "0"
    }
  ]
}

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/nrs_2002",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "nutrition_status",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "disease_severity",
          "points": 0,
          "present": false
        },
        {
          "value": 50,
          "factor": "age_ge_70",
          "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": "Kondrup J, Rasmussen HH, Hamberg O, Stanga Z, Ad Hoc ESPEN Working Group",
        "doi": "10.1016/s0261-5614(02)00214-5",
        "id": "kondrup-2003",
        "pmid": "12765680",
        "source": "Clin Nutr. 2003;22(3):321-336",
        "title": "Nutritional risk screening (NRS 2002): a new method based on an analysis of controlled clinical trials"
      },
      "formula": "nrs_2002",
      "formula_expression": "NRS-2002 = nutrition_status (0–3) + disease_severity (0–3) + 1 if age ≥ 70; max 7; at_risk if score ≥ 3",
      "age_years": 50,
      "max_score": 7,
      "score": 0,
      "at_risk": false,
      "disease_severity": 0,
      "nutrition_status": 0
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "nutrition_status",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "disease_severity",
          "points": 0,
          "present": false
        },
        {
          "value": 50,
          "factor": "age_ge_70",
          "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": "Kondrup J, Rasmussen HH, Hamberg O, Stanga Z, Ad Hoc ESPEN Working Group",
        "doi": "10.1016/s0261-5614(02)00214-5",
        "id": "kondrup-2003",
        "pmid": "12765680",
        "source": "Clin Nutr. 2003;22(3):321-336",
        "title": "Nutritional risk screening (NRS 2002): a new method based on an analysis of controlled clinical trials"
      },
      "formula": "nrs_2002",
      "formula_expression": "NRS-2002 = nutrition_status (0–3) + disease_severity (0–3) + 1 if age ≥ 70; max 7; at_risk if score ≥ 3",
      "age_years": 50,
      "max_score": 7,
      "score": 0,
      "at_risk": false,
      "disease_severity": 0,
      "nutrition_status": 0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	nrs_2002
`formula_expression`	string	Exact expression used
`score`	integer	NRS-2002 points 0-7
`max_score`	integer	7
`at_risk`	boolean	true iff score ≥ 3 (Kondrup 2003 / ESPEN NRS-2002). Not a diet order. No other bands.
`nutrition_status`	integer	Caller-assigned impaired nutritional status 0-3 used
`disease_severity`	integer	Caller-assigned disease severity 0-3 used
`age_years`	integer	Age used for the ≥70 point
`components`	array	Per-item Kondrup 2003 points
`citation`	object	Kondrup et al. Clin Nutr 2003 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "nutrition_status",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "disease_severity",
      "points": 0,
      "present": false
    },
    {
      "value": 50,
      "factor": "age_ge_70",
      "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": "Kondrup J, Rasmussen HH, Hamberg O, Stanga Z, Ad Hoc ESPEN Working Group",
    "doi": "10.1016/s0261-5614(02)00214-5",
    "id": "kondrup-2003",
    "pmid": "12765680",
    "source": "Clin Nutr. 2003;22(3):321-336",
    "title": "Nutritional risk screening (NRS 2002): a new method based on an analysis of controlled clinical trials"
  },
  "formula": "nrs_2002",
  "formula_expression": "NRS-2002 = nutrition_status (0–3) + disease_severity (0–3) + 1 if age ≥ 70; max 7; at_risk if score ≥ 3",
  "age_years": 50,
  "max_score": 7,
  "score": 0,
  "at_risk": false,
  "disease_severity": 0,
  "nutrition_status": 0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_nrs_nutrition`	nutrition_status must be an integer 0, 1, 2, or 3 (Kondrup 2003 NRS-2002). Returned before settlement; you are not charged.
400	`invalid_nrs_severity`	disease_severity must be an integer 0, 1, 2, or 3 (Kondrup 2003 NRS-2002). Returned before settlement; you are not charged.
400	`invalid_age`	age must be an integer from 18 to 120 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

NRI — Apply the VA TPN Cooperative Study 1991 Nutritional Risk Index from caller-supplied albumin and current/usual weight.

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.