1. What is Pregnancy Calculator NSW Health?

The Pregnancy Calculator NSW Health estimates the due date (EDD) based on the last menstrual period (LMP) using the standard calculation of LMP + 280 days, following NSW Health guidelines for pregnancy dating.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy due date formula:

Where:

• \( EDD \) — Estimated Due Date
• \( LMP \) — Last Menstrual Period
• \( 280 \text{ days} \) — Standard pregnancy duration (40 weeks)

Explanation: This calculation assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The 280 days represents 40 weeks of gestation.

3. Importance of Due Date Calculation

Details: Accurate due date calculation is essential for proper prenatal care, monitoring fetal development, planning for delivery, and identifying potential pregnancy complications.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the date field. Ensure the date is accurate for the most reliable due date estimation.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this due date calculation?
A: This method is accurate for women with regular 28-day cycles. Ultrasound dating may provide more accuracy, especially if cycle length varies.

Q2: What if my menstrual cycle is longer or shorter than 28 days?
A: For cycles longer than 28 days, add the extra days to the due date. For shorter cycles, subtract the difference in days.

Q3: When should I confirm my due date with healthcare providers?
A: It's recommended to confirm the due date during your first prenatal visit, typically between 8-12 weeks of pregnancy.

Q4: What percentage of babies are born on their due date?
A: Only about 5% of babies are born exactly on their due date. Most are born within two weeks before or after the estimated date.

Q5: Are there other methods for calculating due dates?
A: Yes, healthcare providers may use ultrasound measurements, conception date, or IVF transfer dates for more precise dating.