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Nadler 1962 Blood Volume Estimator
x402
Nadler 1962 Blood Volume Estimator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Estimates total blood volume in liters for adults using the Nadler 1962 equations, given sex, height, and weight
Price / call$0.005
Success—
StatusUnknown
How this service works
Nadler 1962 predicted blood volume in liters from height, weight, and sex (separate male and female equations). Deterministic published arithmetic with citation. For adults as published; this tool does not take age. Not a transfusion order, Lemmens–Bernstein–Brodsky estimate, or 70 mL/kg rule of thumb.
Output
A numeric estimate of total blood volume in liters computed via the sex-specific Nadler 1962 regression equations, based on the provided height and weight inputs. No age adjustment is applied. Result is deterministic given the same inputs.
Example use cases
Perioperative blood loss planning
“Can you estimate the total blood volume for a female patient who is 162 cm tall and weighs 58 kg using the Nadler formula? I need it for surgical planning.”
ICU fluid management assessment
“Using the Nadler 1962 blood volume equations, calculate the estimated circulating blood volume for a male patient who is 6 feet tall and weighs 190 pounds.”
Anemia workup contextualization
“What's the predicted total blood volume for a 70 kg female who is 5 foot 4, using the Nadler method? I want to put her hemoglobin loss in context.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/nadlerWhen to prefer
Use this endpoint when you need the specific Nadler 1962 published equations for adult blood volume estimation from height, weight, and sex — particularly when citeable, deterministic arithmetic is required. Prefer this over the 70 mL/kg rule of thumb when individualized anthropometric data is available. Not appropriate for pediatric patients, for whom age-adjusted formulas are needed, nor as a substitute for direct blood volume measurement.
Side effects
- Missing required 'sex' parameter returns an error
- Neither height_cm/height_in nor weight_kg/weight_lb provided causes a validation error
- Invalid sex value (not 'male' or 'female') returns an enum validation error
- Extreme anthropometric values outside the original study's adult range may produce biologically implausible outputs without a warning
- Payment not included or insufficient USDC results in 402 payment required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/nadler",
"count": 2,
"items": [
{
"sex": "male",
"formula": "nadler",
"citation": {
"id": "nadler-1962",
"pmid": "21936146",
"title": "Prediction of blood volume in normal human adults",
"source": "Surgery. 1962;51(2):224-232",
"authors": "Nadler SB, Hidalgo JH, Bloch T"
},
"height_cm": 170,
"weight_kg": 70,
"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.",
"blood_volume_l": 4.66,
"blood_volume_ml": 4660,
"formula_expression": "BV_L = 0.3669 * H^3 + 0.03219 * W + 0.6041 (male); BV_L = 0.3561 * H^3 + 0.03308 * W + 0.1833 (female); H meters, W kg"
},
{
"sex": "male",
"formula": "nadler",
"citation": {
"id": "nadler-1962",
"pmid": "21936146",
"title": "Prediction of blood volume in normal human adults",
"source": "Surgery. 1962;51(2):224-232",
"authors": "Nadler SB, Hidalgo JH, Bloch T"
},
"height_cm": 170,
"weight_kg": 70,
"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.",
"blood_volume_l": 4.66,
"blood_volume_ml": 4660,
"formula_expression": "BV_L = 0.3669 * H^3 + 0.03219 * W + 0.6041 (male); BV_L = 0.3561 * H^3 + 0.03308 * W + 0.1833 (female); H meters, W kg"
}
]
}
}Tags
x402
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