Due Date Estimate

Patient

Q: When determining your due date is it more accurate to go by the sonogram are your last missed period to know how many weeks you really are because those dates were two weeks apart for me. which one is more accurate.

Doctor

A:   I understand your hesitation about estimated pregnancy due date. Absolutely, the preferred method to get an estimate of the delivery due date is to use the first day of your last menstrual period to calculate it; this method is also the most accurate than the sonogram to calculate the fetal age therefore it will be also be more accurate in estimating the due date.
This method is also known as Naegele’s Rule, this technique says that forty weeks from any date on the calendar is equal to counting forward nine calendar months plus one week. So if we add nine months plus one week to the date which marks the first day of woman’s last menstrual period, the result will be forty weeks, or the average due date. I hope I cleared your doubt, I wish you the best.

Related Q&A

Q: I rubbed my penis over my girlfriend's vagina. I did not ejaculate. It was covered in pre-ejaculate though and I had ...

Q: Hi I'm a 17 year old female and two weeks ago I started taking the contraceptive pill. Unfortunately I wasn't infor...

Q: If I my girlfriend and I were grinding naked during ovulation or the day before and I had Precum on my finger and fin...

Q: Had sex on day 14/15 of my cycle which is usually 27/28 days. We used a condom but it broke . He wasn't near ejacula...

Q: I had a 3 day bleeding with cramps, which was different from my usual period, 27 days after having had unprotected se...

 
DOCTOR ADVISORY BOARD
218

Dr. James Obaji M.D.

  • 247 Reviews
  • Family Physician
173

Dr. Suneel Sharman M.D.

  • 190 Reviews
  • Family Physician
138

Dr. Pat Golden M.D.

  • 169 Reviews
  • Cardiologist
98

Dr. Kunaal Jindal M.D.

  • 112 Reviews
  • Plastic Surgeon
CNN
BBC
MSNBC
CBS
abcNews
FoxNews