Home
Back
NSW Pregnancy Calculation:
| From: | To: |
The NSW Pregnancy Calculator estimates the due date based on the last menstrual period (LMP) using the standard calculation of LMP + 280 days. This method is widely used in clinical practice throughout New South Wales healthcare settings.
The calculator uses the standard pregnancy calculation:
Where:
Explanation: This calculation is based on Naegele's rule and assumes a regular 28-day menstrual cycle with ovulation occurring on day 14.
Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, scheduling important tests, and preparing for delivery. It helps healthcare providers track pregnancy progress and identify potential complications.
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. The calculator will also show your current gestational age in weeks and days.
Q1: How accurate is the LMP + 280 days calculation?
A: This method is accurate for women with regular 28-day cycles. Only about 5% of women deliver exactly on their estimated due date, with most delivering within 2 weeks before or after.
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 calculation. For shorter cycles, subtract the difference. An ultrasound dating scan may provide more accuracy.
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 gestation, often with a dating ultrasound.
Q4: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements, which are most accurate in the first trimester.
Q5: What is considered full-term pregnancy?
A: Full-term is between 39 weeks 0 days and 40 weeks 6 days. Early term is 37-38 weeks, and late term is 41-41 weeks 6 days.