# magent Alteplase Stroke Dose Calculator (NINDS 1995)

> magent Alteplase Stroke Dose Calculator (NINDS 1995) 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).

Calculates the NINDS 1995 IV alteplase dose for ischemic stroke from patient weight: total_mg = min(0.9 × weight_kg, 90), with 10% bolus and 90% 60-minute infusion breakdown.

## Facts

- Endpoint: GET https://api.magentlab.com/api/calc/alteplase_stroke
- 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/magent-alteplase-stroke-dose-calculator-ninds-1995-f329abfb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1e5NWVJ6cNz47r--j0exN

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 magent-alteplase-stroke-dose-calculator-ninds-1995-f329abfb
```

Example prompt: Calculate the NINDS 1995 alteplase dose for a stroke patient weighing 85 kg — I need the total milligrams, the 10% bolus amount, the 90% infusion amount, and whether the 90 mg cap kicked in.

## When to prefer this

Use this endpoint when you need fast, reliable arithmetic for the NINDS 1995 IV alteplase dosing protocol in acute ischemic stroke — specifically the 0.9 mg/kg formula capped at 90 mg with the 10%/90% bolus/infusion split. This is NOT for tenecteplase, NOT an eligibility screen, and NOT a medical device — it is purely a dosing arithmetic calculator. Prefer this over manual calculation to avoid arithmetic errors in high-stakes clinical workflow automation.

## Known failure modes

- Missing weight_kg parameter returns a validation error
- weight_kg outside plausible range (e.g. 0, negative, or extremely high values) may return an error or clamped result
- Non-numeric weight_kg causes a schema validation failure
- Service unavailable or payment not processed returns HTTP 402 or 5xx

## How this service works

NINDS 1995 IV alteplase milligram arithmetic from weight: total_mg = min(0.9 × weight_kg, 90), 10% bolus, 90% infusion over 60 minutes. Reports milligrams and whether the 90 mg cap applied. Not a medical device, not a prescription, not an eligibility screen, and not tenecteplase.

## Output

Returns the total alteplase dose in milligrams (0.9 × weight_kg, capped at 90 mg), the 10% bolus dose in mg, the 90% infusion dose in mg to be given over 60 minutes, and a boolean or flag indicating whether the 90 mg maximum cap was applied.

## 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": [
      "weight_kg"
     ],
     "properties": {
      "weight_kg": {
       "type": "number",
       "description": "Weight in kilograms (1-500). NINDS 1995 dose is 0.9 mg/kg, maximum 90 mg. magent clamp, not an eligibility band."
      }
     }
    }
   },
   "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/magent-alteplase-stroke-dose-calculator-ninds-1995-f329abfb/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)