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Mandelbrot 1988 Intrauterine RBC Transfusion Volume Calculator
x402
Mandelbrot 1988 Intrauterine RBC Transfusion Volume 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).
Calculates the required red blood cell transfusion volume for intrauterine fetal transfusion using the Mandelbrot 1988 formula based on estimated fetal weight and hematocrit values.
Price / call$0.005
Success—
StatusUnknown
How this service works
Mandelbrot 1988 intrauterine RBC transfusion volume: fetoplacental_volume_ml = 1.046 + estimated_fetal_weight_g * 0.14; volume_ml uses the unrounded fetoplacental volume times (hct_final_percent - hct_initial_percent) / hct_donor_percent. Hematocrit arm only; the paper also allowed platelet count — magent does not implement platelets. Caller-assigned estimated fetal weight; magent does not estimate weight from biometry. Not a medical device or transfusion order.
Output
Returns the computed fetoplacental volume in mL (using the formula 1.046 + estimated_fetal_weight_g × 0.14) and the calculated RBC transfusion volume in mL (fetoplacental volume × (hct_final − hct_initial) / hct_donor), all expressed as numeric values based on the Mandelbrot 1988 model.
Example use cases
Fetal anemia transfusion dosing
“I need to figure out how many mLs of packed red cells to transfuse for a hydropic fetus — estimated weight 2100 g, starting hematocrit of 15%, we want to get it up to 45%, and the donor unit hematocrit is 80%.”
Mid-gestation Rh disease management
“Can you run the Mandelbrot transfusion volume calculation for a 28-week fetus weighing about 1100 g with an initial hematocrit of 22%, a target of 40%, and the blood bank unit coming in at 70% hematocrit?”
Repeat intrauterine transfusion planning
“We're planning a second intrauterine transfusion — fetal weight is now 2500 g, the fetal hematocrit from cordocentesis is 25%, we're aiming for 50%, and the donor pack hematocrit is 85%. What volume should we transfuse?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/intrauterine_rbcWhen to prefer
Use this endpoint when you need to apply the specific Mandelbrot 1988 hematocrit-based formula for intrauterine RBC transfusion volume and already have an externally estimated fetal weight — it does not estimate weight from biometry and does not implement the platelet arm of the original paper. Choose it for programmatic obstetric decision support where a reproducible, formula-driven numeric result is needed.
Side effects
- estimated_fetal_weight_g outside 200–4000 g range returns validation error
- hct_initial_percent not strictly less than hct_final_percent returns constraint error
- hct_final_percent not strictly less than hct_donor_percent returns constraint error
- hct_donor_percent outside 60–90% range returns validation error
- hct_initial_percent outside 5–50% range returns validation error
- missing any required query parameter returns 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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