# Malnutrition Universal Screening Tool (MUST) Calculator

> Malnutrition Universal Screening Tool (MUST) Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Computes the Stratton 2004 MUST score for adult malnutrition risk from BMI, unplanned weight loss percent, and acute disease status

## Facts

- Endpoint: GET https://api.magentlab.com/api/calc/must
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/malnutrition-universal-screening-tool-must-calculator-daede711
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_t6MLo6Coi4jKrkYcH17pH

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability malnutrition-universal-screening-tool-must-calculator-daede711
```

Example prompt: Calculate the MUST malnutrition risk score for an adult patient with a BMI of 17.5 kg/m², unplanned weight loss of 8% over the last 3–6 months, and no acute disease causing nutritional interruption beyond 5 days.

## When to prefer this

Use this endpoint when you need a standards-compliant, reproducible Stratton 2004 MUST score computed server-side from caller-supplied BMI and weight loss percent, especially in agentic clinical workflows where auditability matters. Not appropriate for pediatric patients, MUAC-based assessments, or as a substitute for clinical diagnosis.

## Known failure modes

- BMI value outside valid range (10–80 kg/m²) returns validation error
- weight_loss_percent outside valid range (0–50%) returns validation error
- missing required query parameters returns 400 Bad Request
- payment not provided or insufficient for x402 endpoint returns 402 Payment Required
- boundary values (e.g. BMI exactly 20.0, weight loss exactly 10%) may be misunderstood by callers — endpoint follows Stratton 2004 rules strictly

## How this service works

Stratton 2004 Malnutrition Universal Screening Tool (MUST) for adults. Three additive scores, max 6: BMI (>20 → 0, 18.5–20 → 1 including 20.0, <18.5 → 2); unplanned weight loss % last 3–6 months (<5 → 0, 5–10 → 1 including 10%, >10 → 2); acute disease no nutritional intake >5 days → 2. Risk 0 low, 1 medium, ≥2 high. Caller supplies BMI and weight-loss percent. Not a malnutrition diagnosis, diet order, or MUAC. magent does not weigh the patient.

## Output

Returns the total MUST score (integer 0–6), individual component scores for BMI, weight loss, and acute disease, and a risk category: 0 = low risk, 1 = medium risk, ≥2 = high risk of malnutrition.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "bmi_kg_m2",
      "weight_loss_percent",
      "acute_disease_no_intake_gt_5_days"
     ],
     "properties": {
      "bmi_kg_m2": {
       "type": "number",
       "description": "Body-mass index in kg/m^2 (10-80). Caller-supplied; magent does not weigh the patient or compute BMI. Stratton 2004 MUST: >20 scores 0; 18.5-20 inclusive scores 1; <18.5 scores 2. BMI 20.0 scores 1; 20.1 scores 0."
      },
      "weight_loss_percent": {
       "type": "number",
       "description": "Unplanned weight loss percent over the last 3-6 months (0-50). Caller-supplied; magent does not weigh the patient. Stratton 2004 MUST: <5 scores 0; 5-10 inclusive scores 1; >10 scores 2. 10% scores 1, not 2."
      },
      "acute_disease_no_intake_gt_5_days": {
       "type": "boolean",
       "description": "Acute disease with no nutritional intake for more than 5 days (Stratton 2004 MUST). true scores 2; false scores 0."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/malnutrition-universal-screening-tool-must-calculator-daede711/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.magentlab.com](https://www.zero.xyz/host/api.magentlab.com/llms.txt)