Women have shared that they have had two different ultrasounds the very same day by two different techs and measurements have been quite different.
I've also pointed out, that this discrepancy in numbers has also been noted. In the article Does Ultrasound Sometimes Misdiagnose Miscarriages on WebMD, they had this to say:
"The fourth study explored the accuracy of ultrasound measurements when repeated by the same doctor, and also by a different doctor. Although the repeated measurements were largely similar, there was enough variation to raise concern - particularly when the measurements were close to the cut-offs used in guidelines to diagnose miscarriage. For example, if one doctor measured the sac as being 20 millimetres in diameter, the range for the other doctor’s measurement varied from 16.8 to 24.5 millimetres."In pregnancy a difference of 4mm can 'make or break a pregnancy' from a physician's point of view. If the sac *looks* too small, they can diagnose a miscarriage and try to push a D&C. We see that all the time on the Misdiagnosed Miscarriage site.
So, this week when yet another mom posted that her pregnancy was being doomed (chromosomal abnormalities, miscarriage) based on the measurements of the yolk sac, I cautioned her to take that information with a grain of salt. I'll post more on the 'yolk sac scare' in a future post. Just in a nutshell, we've had women report being given little to no hope based on yolk sac measurements and their babies were just fine.
After continued prodding to have another ultrasound scan, everything was measuring just fine. In fact, the ultrasound tech rechecked the previous ultrasound photos, did measurements on them and, you know what happened, she got different measurements off the EXACT SAME PHOTOS. The measurements had been completely normal and almost half what the first tech had said!
Moral of this story? You can take the exact same ultrasound photo and two different techs can get two different measurements. Don't stress the measurements. There is a really good chance that no matter what measurement you get, it's off.
(((hugs))) to anybody going through a miscarriage scare right now.