What Causes 2 Weeks Difference Between Gestational Age And Ultrasound Scan Age?

Posted on Mon, 6 Jul 2015

Question: if i am on the first day of my 6th week but my ultrasound came back at 4 weeks what can that mean? i know for sure when my period was and when my period was due without question. My period was like clock work never late.

Answered by Dr. Nidhi Setia (1 hour later)

Brief Answer:
Ultrasound report within normal range.

Detailed Answer:
Hello,
Welcome to HCM,

I can understand your concerns.

You need not to be worry because If the difference between your gestational age(calculated by Last menstrual period) and the ultrasound scan age(calculated by baby`s growth) is less than two weeks, it is considered to be normal.
As in your case it is less than two weeks,so it is normal.

Still,I advise you to go for further ultrasound after two weeks.If baby`s heart beat is normal and the difference between gestational age and ultrasound scan age does not increase, then there is no need to worry.

Kindly keep in regular touch with your gynecologist for further monitoring.

Hope this helps.
Feel free to ask further.
Thanks.

Above answer was peer-reviewed by : Dr. Neel Kudchadkar