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UK Due Date Formula:
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The UK Due Date Calculator From Conception estimates the expected delivery date based on the conception date using the standard UK medical formula. This method is commonly used when the conception date is known with certainty.
The calculator uses the UK due date formula:
Where:
Explanation: This calculation assumes a standard pregnancy duration of 266 days (38 weeks) from the actual date of conception, which is the method preferred in UK clinical practice when conception date is known.
Details: Accurate due date estimation is crucial for prenatal care planning, monitoring fetal development, scheduling important tests, and preparing for delivery. It helps healthcare providers track pregnancy progress and identify any potential complications.
Tips: Enter the known conception date in the date picker. The calculator will automatically compute the estimated due date by adding 266 days. Ensure the conception date is accurate for the most reliable result.
Q1: Why 266 days instead of 280 days?
A: 280 days (40 weeks) is calculated from the first day of the last menstrual period (LMP), while 266 days (38 weeks) is from the actual conception date, accounting for the typical 2-week difference.
Q2: How accurate is this calculation?
A: When the conception date is known precisely, this method is highly accurate. However, only about 5% of babies are born exactly on their due date.
Q3: What if I don't know my conception date?
A: If the conception date is unknown, use the last menstrual period (LMP) method by adding 280 days to the first day of your last period.
Q4: Does this work for IVF pregnancies?
A: Yes, this method is particularly accurate for IVF pregnancies where the conception date is precisely known.
Q5: When should I consult my healthcare provider?
A: Always confirm your due date with your midwife or doctor, and attend all scheduled prenatal appointments for proper pregnancy monitoring.