# Magent Neonatal Partial Exchange Transfusion Volume Calculator (Kumar 2004)

> Magent Neonatal Partial Exchange Transfusion Volume Calculator (Kumar 2004) 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 volume of blood to remove and replace in a neonatal partial exchange transfusion using the Kumar 2004 formula, targeting 55% hematocrit.

## Facts

- Endpoint: GET https://api.magentlab.com/api/calc/neonatal_partial_exchange
- 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-neonatal-partial-exchange-transfusion-volume-calculator-kumar-c54ed2df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yyCOfh6GaYY6xm_M6Suux

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-neonatal-partial-exchange-transfusion-volume-calculator-kumar-c54ed2df
```

Example prompt: Calculate the partial exchange transfusion volume for a neonate using the Kumar 2004 formula — the baby's actual hematocrit is 70% and the assigned blood volume is 280 mL.

## When to prefer this

Use this endpoint when you need a fast, deterministic, citation-backed calculation of neonatal partial exchange transfusion volume per the Kumar 2004 formula. Prefer it when the caller has already determined the blood volume and actual hematocrit and simply needs the arithmetic applied correctly. Not suitable for generating clinical orders, choosing saline versus plasma, or deciding whether transfusion is indicated.

## Known failure modes

- actual_hct_percent at or below 55 is rejected (must be above the 55% target)
- blood_volume_ml outside 40–600 mL range returns a validation error
- missing required query parameters (actual_hct_percent or blood_volume_ml) returns an error
- non-numeric input values are rejected

## How this service works

Partial-exchange volume from Kumar 2004: volume_ml = (actual_hct_percent - 55) / actual_hct_percent * blood_volume_ml. Desired hematocrit is the trial's 55 percent only. Caller assigns blood volume; magent does not choose millilitres per kilogram or saline versus plasma. Not a transfusion order or indication (the trial found no long-term benefit in asymptomatic LBW). Deterministic published arithmetic with citation.

## Output

Returns the calculated partial exchange transfusion volume in millilitres, computed as (actual_hct_percent - 55) / actual_hct_percent * blood_volume_ml, based on the deterministic Kumar 2004 arithmetic targeting a 55% desired hematocrit.

## 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": [
      "actual_hct_percent",
      "blood_volume_ml"
     ],
     "properties": {
      "blood_volume_ml": {
       "type": "number",
       "description": "Caller-assigned blood volume in millilitres (40-600). magent does not choose millilitres per kilogram."
      },
      "actual_hct_percent": {
       "type": "number",
       "description": "Actual hematocrit as percent (56-90). Must be above the trial desired 55."
      }
     }
    }
   },
   "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-neonatal-partial-exchange-transfusion-volume-calculator-kumar-c54ed2df/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)