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🤰 Obstetric Wheel

Pregnancy Dating Calculator
💡 Obstetric dates calculated from LMP using Naegele's rule (LMP + 280 days, or LMP - 3 months + 7 days + 1 year).
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Estimated Due Date (EDD)
Conception
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Current GA
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1st Trimester Ends
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2nd Trimester Ends
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Term Begins
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Post-term
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Trimesters:
•T1: 0-13 weeks
•T2: 14-27 weeks
•T3: 28-40 weeks
•Term: 37-42 weeks
•Post-term: >42 weeks

📚 Evidence & Guidelines Class I Recommendation
★★★★★ (2014)
Citation: American College of Obstetricians and Gynecologists. Method for estimating due date. Committee Opinion No. 611. Obstet Gynecol. 2014;124(4):863-866.
Guideline: ACOG Pregnancy Dating Guidelines
📖 View on PubMed
class="disc">⚠️ Medical Disclaimer

For dating purposes. Ultrasound for confirmation.

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