How accurate is ultrasound measurements?

Question

I just had my first ultrasound. I should be 7w1d. I know my dates is exact because I know when I ovulated and I got a bfp at 8dpo. The ultrasound measured 6w4d  which is impossible.

Answer

Plus or minus up to 10 days. They won't change a due based on your charting.

Answer

Are you positive you ovulated when you did? Early ultrasound is pretty accurate.

Answer

Actually, ultrasounds are not that accurate because due dates are not accurate, measurements aren’t accurate as well, but your days could very well be off because sperm doesn’t hit the day you want it to, many woman’s due dates change three times before they get a stable one but even then no way to tell a 100% due date

Answer

Since due dates are always off + or - two weeks, it doesn’t matter much honestly. Babies are very rarely ever born on their due dates anyway.

Answer

Both my boys measured right on track excepr my firsr one at 12 weeks always measured bigger by 2 weeks but was actually really tiny and my littlest one was smaller mostr of my prefnanxy till the end he was quite big for a premie soon ultrasoumds are not always accurate

Answer

My ultrasound was off by a week, 
I thought I was 9W 4 days, she measured 8W 4D. 
She caught up at the 12 week scan, and measured exactly to the ovulation & conception date.
Try not to worry yourself unnecessarily, as long as the baby is healthy focus on keeping relaxed! 😊

Answer

It can vary by a couple days. I wouldn’t worry about it as long as you saw a heartbeat and everything looked good. When you got your peak you may have ovulated a full day later, making it 6w6d based on ovulation, which is only 2 days off their measurements. My edd by ovulation was June 1st, and first ultrasound put me at May 31st, so it was basically the same. In the end babies don’t care one flip about when they’re “due” anyway.

Answer

I went into my ultrasound at 8w1d and they told me I was 7w1d. My midwife politely ignored the ultrasound techs date and stayed with 8w1d. Babies grow at different rates. (For me the date was pretty important because I’m a VBAC and they need to know a very accurate due date) the midwife says if there’s a 10 day discrepancy between what you thought you were and what the tech says you are, they’ll re-assess. But mine was only 7 days so the midwife went with original date.

Answer

Early in pregnancy they are pretty accurate.

How accurate is ultrasound measurements?

Let's Glow!

The Top Baby Tracker App: Embrace New Beginnings with Tender Care

The Top Fertility Tracker App: Your Path to Achieving Pregnancy

The Top Pregnancy App: Nurturing Your Journey to Motherhood

The Top Period Tracker for Empowering Your Menstrual Health Journey