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EDD Calculation Formula:
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The EDD (Estimated Due Date) Pregnancy Disability Calculator determines the expected delivery date by adding 280 days (40 weeks) to the first day of the last menstrual period (LMP). This calculation is particularly important for determining disability leave periods related to pregnancy.
The calculator uses the standard Naegele's rule:
Where:
Explanation: This calculation assumes a regular 28-day menstrual cycle with ovulation occurring on day 14. The 280 days represent 40 weeks of gestation.
Details: Accurate EDD calculation is crucial for planning prenatal care, determining disability leave periods, and identifying potential preterm or post-term pregnancies. Many workplace policies and insurance claims require this date for pregnancy-related disability benefits.
Tips: Enter the first day of your last menstrual period (LMP) in the date field. The calculator will automatically compute your estimated due date (EDD) by adding 280 days (40 weeks) to the LMP date.
Q1: How accurate is this calculation?
A: This provides an estimate. Only about 5% of women deliver on their exact due date. Most deliver within 2 weeks before or after.
Q2: What if my cycles aren't 28 days?
A: For irregular cycles, ultrasound dating in early pregnancy is more accurate. The calculator assumes a standard 28-day cycle.
Q3: Why is this important for disability?
A: Many workplace policies and state disability programs use the EDD to determine the start and duration of pregnancy-related disability leave.
Q4: Does this account for leap years?
A: Yes, the calculator automatically accounts for leap years in the date calculation.
Q5: When should I confirm with a healthcare provider?
A: Always confirm your due date with your healthcare provider, especially if you have irregular cycles or if ultrasound dating differs significantly from LMP-based dating.