How accurate is ultrasound dating at 10 weeks

“My due date got put back by 2 weeks at the 12 week scan. Original When do you normally have a dating scan? Just how accurate (or not) can the dating scan be? . An ultrasound between weeks is the most accurate, not
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With my first at both my early ultrasounds the dates were within a day. This time around I had an early ultrasound at 8 weeks because I didn't even get my period back since my last baby. I seem to remember reading that 8 week ultrasound are most accurate, to within a day or two even if you know when your last period was, that doesn't guarantee an accurate due date since dates of ovulation can vary quite a bit. The longer you wait the less accurate an ultrasound is for dates. At 20 weeks they can be off by at least a week. I had one at 7. I think I read that the earlier ultrasounds are more accurate for predicting due dates then the third thrimester ones based on size.

But, the baby will come out either way - whether its December or January - if you aren't a planner it might be fun to wait and see. I have heard between weeks is the most accurate. Because I'm high risk history of 8 miscarriages and severe pelvic inflammatory disease I've had 6 ultrasounds. My first one, turns out I was 4w3d, we couldn't see anything. My second one was 5w4d, I had a sac but no fetal pole, it dated me earlier than I could have been.


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Number 3 through 6 have all dated the baby consistantly 7w through 12w5d. I'm done with ultrasounds now, I've just hit my second trimester!!! It looks like by the last period date you gave, you are about 9 weeks. A dating ultrasound now should be fine, you should be far enough along to see a fetal pole, and maybe even a heartbeat even if you ovulated a week or 2 late. Thanks for responses - it sounds like ultrasounds are somewhat accurate within a week or so I am not the type to worry about what day But then my boyfriend was a huge baby hes 6'4'' now so i could have a huge baby.

I am worried about the HUGE baby too, he is 6' Most drs wont change a due date after 20wks if the baby measures bigger, they will just say your having a big baby.

I'd say the earlier ones probably are a little more accurate. The one I had a few weeks later was still only days earlier. I had one a little over a week ago that put our baby as being 6 days earlier than the original EDD. I wouldn't be surprised if we go in next week and are told that we're a tad earlier still.

DH and I are both fairly tall and if genetics reallys starts kicking in later on, our baby could just be "taller" than average without being "older.

Ultrasound: Sonogram - American Pregnancy Association

The earlier the US the more accurate it is. But the anatomy scan it could show something different since babies grow at different rates but you should still go by the 1st ones date. And the later the US the more inaccurate it can get too. I know I had one a month before my due date because I changed hospitals and they didn't have all my records so didn't have my 20 week scan and they told me that the baby was almost 8 lbs at that time so I would prolly have a 9 lb baby My EDD's by ultrasound were pretty accurate.

What types of ultrasound are there?

My daughter was born two days early and my son was born two days late. Ok, now follow this if you can- My daughter was due on the 18th and was born on the 16th, my son was due on the 16th and born on the 18th! Archived Discussion This discussion is archived and locked for posting See active discussions on October Babies.

In clinical practice, the gestational age and EDD are often determined using the LMP, except when the discrepancy between the LMP-derived gestational age or EDD and that of early pregnancy ultrasound scan exceeds 1 week; in this situation, the ultrasound scan estimates are more reliable and should be used.

Further, the rate of post-term pregnancy has been shown to decrease when early ultrasound scan is used in estimating the gestational age and EDD. The uncontrolled proliferation of ultrasound in Nigeria has further heightened the conflict between these two estimates of delivery date because pregnant women are increasingly having access to ultrasound scanning manned by various cadres of health workers, without information on its known limitations.

Ultrasound: Sonogram

This scenario is a big challenge in terms of prevention of prolonged pregnancy in our environment where women register late for antenatal care 9 and rarely have reliable early ultrasound scan results. A scenario is often created where the attending medical practitioner feels the pregnancy is prolonged based on a certain LMP-derived EDD while the client holds a different view based on her ultrasound scan-derived EDD, and therefore refuses to accept induction of labor despite counseling.

The aim of this study was to determine the perception and acceptability of menstrual dating EDD derived from LMP for timing of labor induction for postdatism by pregnant women who have a late pregnancy ultrasound scan. Enugu State is one of the five states in the southeast geopolitical zone of Nigeria, and its capital city is Enugu.

It has an average annual temperature of The state covers a land area of approximately 8, The Enugu State University Teaching Hospital, Parklane, is a state-owned teaching hospital located in the center of the Enugu metropolis.

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Both centers provide antenatal and postnatal care services to pregnant women in Enugu State. The commonest indication for induction of labor in the two hospitals and in our environment is prolonged pregnancy. This was a cross-sectional study of consecutive pregnant women attending for antenatal care at the antenatal clinics of the University of Nigeria Teaching Hospital, Ituku-Ozalla, Enugu, and the Enugu State University Teaching Hospital, Parklane, from January 1, to March 31, Every singleton pregnant woman due for a routine delivery planning discussion at a gestational age of 36 weeks and beyond was eligible for the study.

Exclusion criteria included uncertainty of date, presence of contraindications to vaginal delivery, irregular menstrual cycle prepregnancy, use of hormonal contraceptives prior to pregnancy, or bleeding during pregnancy. After individual counseling of eligible participants, pretested structured questionnaires were administered to consecutive consenting women by trained medical interns. Ethical clearance for the study was obtained from the institutional review board of the University of Nigeria Teaching Hospital, Enugu.

Data collected included the sociodemographic characteristics of the respondents age, marital status, tribe, level of education, occupation, parity , opinions and preferences regarding LMP and ultrasound scan dates, and their attitudes toward postdatism and induction of labor in relation to estimated dates.

The primary outcome measure was willingness to accept induction of labor at an LMP-derived gestational age of 40 weeks plus 10 days when late pregnancy ultrasound scan-derived gestational age was less than 40 weeks plus 10 days. The first trimester was defined as a gestational age of 1—13 weeks, the second trimester as 14—27 weeks, and the third trimester as 28—42 weeks.

Further, the early second trimester was defined as a gestational age of 15—22 weeks and the late second trimester as 23—27 weeks. Frequency tables were generated for relevant variables. A P -value of less than 0. A total of questionnaires were administered, but only were completed correctly, giving a response rate of The mean age of the respondents was Most of the women Four hundred and thirty-one respondents The majority of respondents were multiparous Further details of the sociodemographic characteristics of the respondents are shown in Table 1.

First Ultrasound - Dating Ultrasound - 10 Weeks Pregnant

The mean gestational age at recruitment and antenatal booking for respondents was One hundred and sixty-seven One hundred and ninety-one The remaining eight women 1. On the other hand, All the women who responded positively Likewise, all the women who responded negatively Characteristics of respondents versus acceptance of labor induction for postdatism using menstrual dating. OR, odds ratio; CI, confidence interval.