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magent Pregnancy Due Date Calculator (ACOG 700 Naegele)
x402
magent Pregnancy Due Date Calculator (ACOG 700 Naegele) 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 estimated due date (EDD) and gestational age from last menstrual period (LMP) using the ACOG Committee Opinion 700 Naegele formula adjusted for cycle length.
Price / call$0.005
Success—
StatusUnknown
How this service works
Pregnancy estimated due date from a certain LMP using ACOG Committee Opinion 700 Naegele: edd_days_from_lmp = 280 + (cycle_length_days - 28). Inputs are numeric days_since_lmp (0-294) and cycle_length_days (21-35); those bands are magent clamps. Reports gestational_age_days and days_until_edd (negative if past EDD). Not a dating ultrasound. magent does not interpret imaging. Not a delivery date order.
Output
Returns gestational_age_days (completed days of gestation since LMP) and days_until_edd (days remaining until estimated due date; negative values indicate the EDD has already passed), computed using the ACOG 700 Naegele formula: EDD = LMP + 280 + (cycle_length_days − 28).
Example use cases
First prenatal visit gestational dating
“A patient came in today — her LMP was 56 days ago and she has a 26-day cycle. Can you tell me her gestational age in days and how many days until her estimated due date?”
Irregular cycle EDD adjustment
“I have a patient with a 35-day cycle whose LMP was 42 days ago. What does the Naegele formula say her EDD and gestational age are, accounting for the longer cycle?”
Late pregnancy countdown check
“My LMP was 260 days ago and my cycle is 28 days — how many days am I from my due date and what's my gestational age?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/pregnancy_due_datesWhen to prefer
Use this endpoint when you need a quick, formula-based EDD or gestational age computation grounded in ACOG Committee Opinion 700 and adjusted for non-28-day cycles. Prefer it over general-purpose date arithmetic because it correctly applies the Naegele cycle-length correction. Do not use it as a substitute for ultrasound dating, imaging interpretation, or clinical delivery planning.
Side effects
- days_since_lmp outside 0–294 range is clamped or rejected
- cycle_length_days outside 21–35 range is clamped or rejected
- Missing required query parameters returns an error
- Non-integer inputs rejected by schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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