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What causes discrepancy in ultrasound dates at 5 weeks pregnancy?

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Posted on Mon, 14 Dec 2015
Question: Hi!
I hope you are well.
I have a question regarding to pregnancy.
I had a internal scan last saturday 21.11 by that time my doc could see a gestation sac and a yolk sac MSD was 0.8cm.
Because I had some pain 2 days in a row i had to have another scan. This was today (26.11). I had gestation sac, yolk sac and we could also see the baby 2.5mm
Because i got 2 totally diffrent gestational ages I would like to ask you... The numbers i gave you could you tell me what is the gestation age in your oppinion.

Many thanks
doctor
Answered by Dr. Deepti Verma (11 minutes later)
Brief Answer:
Please upload the reports

Detailed Answer:
Hi dear, I have gone through your question and understand your concerns. Please upload both the ultrasound reports so that I can give a detailed explanation.
Regards
Dr Deepti Verma
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Deepti Verma (47 minutes later)
Thanky you for the reply. I hope theese photos help.
doctor
Answered by Dr. Deepti Verma (18 minutes later)
Brief Answer:
Correct gestational age calculated by ultrasound

Detailed Answer:
Hi dear,
I have reviewed the reports.
According to the two ultrasound reports, your pregnancy is progressing normally, with normal fetal cardiac activity.
However, gestational age by ultrasound do not corresponds to the gestational age calculated by last menstrual period.It can be due to delayed ovulation and hence delayed conception.
Your correct gestational age will thus be calculated by your ultrasound.
Hope you found the answer helpful.
Regards
Dr Deepti Verma
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Deepti Verma (45 minutes later)
Thank you for your answer. But is it possible to say when the fertilization occurred. Was it after the intercourse that happend 25.10 or after intercourse that happend 04.11.

Many thanks
doctor
Answered by Dr. Deepti Verma (8 hours later)
Brief Answer:
Fertilization likely after 4/11

Detailed Answer:
Hi dear, fertilization most likely occurred after the intercourse on 4/11.
Regards
Dr Deepti Verma
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Deepti Verma (1 hour later)
Good morning!
Thank you fir the relpy. Although it was a tricky qestion. If i read back 5,2 weeks i get that i was fertilized on 4/11 as well. But i was on a trip from 2/11 til 9/11 and no intercourses happend at that time. Thats's why this is a mistery for me. The last intercource i had was on 25-26/10
doctor
Answered by Dr. Deepti Verma (6 minutes later)
Brief Answer:
Calculations explained

Detailed Answer:
Hi dear, the exact date of fertilization cannot be detected in a irregular cycle, or in cases of delayed ovulation.
However, if we calculate by estimation, then if you were 5 weeks2 days on 26/11, then the expected date of fertilization is anywhere between1/11 to 4/11.
Since the sperm are alive in the genital tract for 5 days after intercourse, so any intercourse on 26/10 can lead to fertilization on 1/11.
I think I am able to explain you.
You can get back to me for further queries.
Regards
Dr Deepti Verma
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
Answered by
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Dr. Deepti Verma

OBGYN, Maternal and Fetal Medicine

Practicing since :2009

Answered : 5068 Questions

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What causes discrepancy in ultrasound dates at 5 weeks pregnancy?

Brief Answer: Please upload the reports Detailed Answer: Hi dear, I have gone through your question and understand your concerns. Please upload both the ultrasound reports so that I can give a detailed explanation. Regards Dr Deepti Verma