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How Is Delivery Date Calculated From Day Of Conception?

Posted on Mon, 25 Sep 2017

Question: I'm 25 weeks pregnant and my EDD is 12th Dec... since I'm working now I have to inform about my maternity leave plans... what are the chances of delivering near to delivery date... from when I need to be on leave... few people told in later scan sometimes our EDD gets preponed hence its getting difficult to plan ... I need proper guidance

Answered by Dr. Deepti Verma (30 minutes later)

Brief Answer:
Exact date cannot be predicted

Detailed Answer:
Hi dear,
I have gone through your question and understand the concerns.

The delivery can occur anywhere between 37-42 weeks of gestation.
It is not always that the delivery occurs on the due date itself.

The EDD gets changed in later ultrasounds due to the inherent error of ultrasound dating in the third trimester, therefore EDD is always calculated from the date of the last menstrual period.

Thus, the exact date of delivery cannot be predicted at this stage.

Hope you found the answer helpful. Let me know if I can assist you further.

Regards
Dr Deepti Verma
OBGYN
Maternal and fetal medicine specialist

Above answer was peer-reviewed by : Dr. Arnab Banerjee

Follow up: Dr. Deepti Verma (28 hours later)

That means I need to stick on to the EDD given during dating scan.... Now a days if I stand for some time or if I walk for more than 20min I'm getting upper back ..so it's due to pregnancy or my posture is not correct

Answered by Dr. Deepti Verma (8 hours later)

Brief Answer:
Incorrect posture

Detailed Answer:
Hi dear,
Yes, the EDD is calculated by LMP or dating scan.
Upper back pain can be due to posture abnormalities.
Correct posturing, calcium and dairy products will help you.
Regards
Dr Deepti Verma

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar