Can a pregnancy dating scan be wrong

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  • 3 Reasons Why a Fetal Ultrasound May Be Wrong
  • NHS and private ultrasound scans during pregnancy
  • Ultrasound Accuracy for Predicting Due Dates
  • Can a dating scan be wrong
  • Your pregnancy and baby guide
  • 3 Reasons Why a Fetal Ultrasound May Be Wrong
  • Can your pregnancy scan give the wrong due date?

Every pregnant woman wants to know her due date , and a due date that is calculated from her last menstrual period with a due date calculator often doesn’t match the due date that is estimated by her first ultrasound also known as a sonogram. During an ultrasound, a technician will spread a warm gel over the lower part of your abdomen and then press a tool called a transducer against your belly to examine your fetus using sound waves. An image of your fetus will appear on an accompanying computer screen and while looking at this image, the technician will take some standard measurements from different angles and listen for a heartbeat. Don’t worry: This type of exam is painless and risk-free, and seeing your baby for the first time will likely be an enjoyable experience. Naturally, one of the most common questions asked about ultrasound accuracy is:

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As its name suggests, the main purpose of a dating scan is to check how advanced the pregnancy is and therefore when the baby is due. Measuring the baby can be more accurate than dating by the last menstrual period. It is also an opportunity to check the baby is alive and developing as expected, and check for twins.

This scan may also be part of your screening test for Down’s syndrome nuchal translucency scan. Occasionally, if the baby is in an awkward position, an internal scan may be carried out, using a vaginal probe. We spoke to a few women who had experienced this; they were not distressed by it, though for some people it may be embarrassing. Well, one of the major things that I think we were wanting to get out of the scan was to discover that there was only one baby, because my husband is a twin and as far as I was aware, there was no history of twins in my family.

But it actually turns out that my father’s parents on both sides there had been a history of identical twins, but they had died so we didn’t know about it, because they’d died as babies. I actually was kind of thinking, ‘Oh, well, if it was twins then what you don’t know won’t hurt you’. And, you know, I’ve never had a baby before so if I had two then I wouldn’t know any different to just having one.

My husband, on the other hand, was quite relieved to see there was only one, because he was of the opinion that one would have to be sold because we wouldn’t be able to afford two! So he was quite pleased. Did you know about your family history then, before you went for the scan or did it only come up afterwards when somebody said, ‘Oh, yeah, we’ve got twins too’? It came up when I found out I was pregnant. Because my husband’s a non-identical twin, so we didn’t think there was much risk of any sort of genetic thing, but the fact that there was identical twins was kind of a bit of a, ‘Oh, right, okay, you might have told me that beforehand.

I suppose it was very emotional, actually. It was a lot more emotional than I thought it would be. I mean, I’d heard people saying, ‘Oh, you know, you’re so moved’ and I thought, you know, because I’ve seen it, when people show me scans I’ve thought, ‘I can’t make that out’, and they say, ‘There’s the baby’ and I think, ‘Oh right, okay.

And then, you know, we saw this little thing, which the ultrasound technician couldn’t, it was asleep at the time, so she was poking it and trying to get it to move, which it eventually did, poor little thing. So, but yes it was really quite a moving experience. And did the ultra-sonographer talk you through what he or she was doing? Yeah, yeah, she was very good actually’. Was there any point where you felt you weren’t being given enough information about what they were looking at or for?

No, she was actually very, very good. I mean, I did ask when she was having a look to try and, and she was trying to measure the fetus, and I asked how many there were, because she hadn’t actually said, you know, ‘There’s only one’. I think that’s the only time I had to actually ask her anything. She was very, very good. Talked us through it. As with other scans, most women and their partners found it enjoyable and reassuring, and were relieved to see there really was a baby.

The chance to take home a photograph was valued – a charge may be made for this. Many people felt positive about the way staff talked them through what they were doing, including a woman who had seen scans before as a health professional. One woman described how special it seemed to her, whilst for the staff it seemed very routine. They did not say much and it seemed very quick. How did that go? Did you both go?

Yes, we both went. It was very, very straightforward, you know, and a fantastic experience. And we actually managed to just, to see a really good image on the screen, which looked like a baby! And it, I think that we did feel, it was very quick. That was sort of one thing that I think we hadn’t quite expected how quickly it was done. And we realised that we were just one of thousands, whereas, you know, when you’re actually experiencing it you’re the only people in the world who are looking at a fetus on the screen of your baby.

But I think that was something I remember from it. It was very matter-of-fact from their point of view, but it was incredibly significant for us. But there was a sense of sort of relief when it was there. I suppose for me personally to see this baby was just confirmation that it was there, given I hadn’t really had any symptoms, and there was no denying its existence and it was actual visual proof that there was a child there.

What about your husband’s feelings? Yeah, very similar I think. Yeah, he very much enjoyed it and was excited and, you know, we got a print-off of the scan and got copies for the grandparents and that sort of thing. Did the person doing the scan communicate much with you during it? No she didn’t. I mean I’m often sort of curious to know who these people are and what, you know, whether this is all they do all day every day or whether it’s a broader part of their, part of a broader job and things and she didn’t actually seem particularly interested in engaging in conversation.

It did feel very much of, ‘Yes, you’re the next on my list of people to scan’. I did note that there were sort of no introductions, for instance she didn’t sort of say, ‘I’m. There was not very much rapport building, I didn’t feel. I didn’t particularly feel I needed that personally, but it did cross my mind at the time that had I been feeling more anxious than I was, or perhaps if I’d been on my own, it didn’t feel the most comforting of environments.

Sometimes the week scan is performed at the same time as the booking-in visit with the midwife, so there has been little time to discuss beforehand what might happen. For some people, the dating scan is the point when they discover that their baby has not survived. Several people described what a terrible shock this was, and how they did not feel prepared for this possibility. And just thinking back to that first scan, what was that experience like, and how was the news communicated to you?

It was a terrible shock, I think, because it was my first pregnancy. I was then very inexperienced. I hadn’t even heard of, I’d heard of miscarriage and the sort of regular things that go wrong with sort of early pregnancy. So when the lady who was scanning me asked me if I was sure I was pregnant, I mean I just did not understand what she was saying.

So I mean I thought I was 14 weeks pregnant. I probably could’ve understood if she’d said the baby’s died or there’s something wrong with it. But when she asked me if I was sure I was pregnant I just, you know, I just couldn’t comprehend what she was saying. And then she showed me a picture of the womb and there was nothing there. It was, I think I was in shock for about a week, I just sort of couldn’t understand sort of what had happened. Did your husband come with you to the scan?

No, he didn’t actually. I mean, we’ve always been, you know, sort of quite independent, and I actually just went with my sister. I didn’t, I suppose that’s one of the sort of, it was the sort of first example, I didn’t see it was like a sort of massive thing. Even though I was definitely nervous, because I thought, you know, it might have died or something, you know. It might have gone wrong. But I definitely wasn’t prepared for what had happened to have happened.

And then I called him and, you know, he came along and was then with me until I went home. But I think it was just the emptiness of the whole experience afterwards. You feel sort of numb with kind of disappointment and upset. And I think because I feel so dreadful in early pregnancy that it completely stops my life, so you feel like you’ve had – not that it’s been wasted – but you know, I can’t do anything, I’m just constantly sick, you know, just feel terrible, and you just feel so let down.

You just think, ‘I’ve gone through all that for nothing, and I’ve got to go through it all again if I want to get pregnant again’. So it feels like quite an upheaval to get over that sort of, those feelings. And then I knew that this isn’t right. And then she did an internal scan and she said – she first, when she couldn’t, she said, “Oh, I can’t, I’m, I’m” – I can’t remember how she phrased it but she didn’t say in an alarmed way, “Ooh, there’s a problem,” but she did say, “Oh, I’m having trouble.

Would it be OK for me to do an internal scan? So she explained when she thought, what size the fetus was and so how old it was when it had died, and offered me a photo and said, you know, she gave me a bit of information. And then after that I saw a GP as well, but that was obviously partly because there was going to be a procedure involved to, you know, I went into hospital the next day. But she, the GP then explained what the, and they were very, I think it was dealt with in a very sensitive way then.

It was very supportive. I think it was handled as sensitively and as kindly as it could have been, I think. It’s more that before I had the scan, knowing what the chance, knowing that information about what the chance of miscarriage was. And that’s a difficult, I can see how for a GP that’s hard, if I go and I say, ‘I’ve found I’m pregnant,’ and to say “Well, you know, this is, you’ll have a scan then but you must be aware that” – I know that’s really hard and that people – when I’ve just said that, you know, I was feeling so elated and that it was very sort of mundane, but actually they could’ve explained why they were being quite mundane about it, I think and just sort of saying, I don’t know, I think I mean, you know, and had to hare sort of, like – I don’t know, what is it?

Two hundred miles down the motorway, feeling absolutely like ghastly, you know. Because they were not expecting any problems neither of these women had their partner with them, although both had taken a friend or relative instead and were glad not to be alone. One of them explained how she knew straight away from the sonographer’s behaviour that something was wrong, even though she was supportive and tried not to make her anxious.

She was given a photo to keep. Another mother who had paid for a private scan was touched that the staff returned her money when the baby was found to have died. A dating scan cannot usually provide an assessment of the risk of the baby having Down’s syndrome, but occasionally it can detect very obvious problems. This is something people did not feel well prepared for.

Want week-by-week pregnancy updates in your inbox? We’ve That does seem very odd, but I though dating scans couldn’t be wrong by more than a few days. And if not, could it mean something’s wrong and the baby isn’t growing properly? You have to wait for the 12 week dating scan – this will be more accurate.

You can calculate your due date by subtracting three months from the first day of your last menstrual period LMP and then add a week. Use our pregnancy calculator. A pregnancy is based on being days long, which is 40 weeks more like 10 months not 9! When we give you a due date we consider 37 to 42 weeks to be full-term, so even if your baby is born two weeks before your due date it is not considered premature.

As its name suggests, the main purpose of a dating scan is to check how advanced the pregnancy is and therefore when the baby is due. Measuring the baby can be more accurate than dating by the last menstrual period.

A vaginal ultrasound is an ultrasound scan taken by a probe inserted into the vagina. It gives a clear picture of the fetus, cervix and placenta.

NHS and private ultrasound scans during pregnancy

Na osnovu tradicije i modernog, cvecara Cveta je postala lider u svojoj delatnosti na prostoru Srbije T scan? Ultrasound scan? How indispensable health scotland is wrong nhs dating scan dating is a missed period. Even dating scan provider.

Ultrasound Accuracy for Predicting Due Dates

That baby is due in a week — you feel as big as the Death Star, you have to pee 7 million times a night and you just want that baby out! But should you keep going to work as usual, or fumble through the car seat installation instructions and get that birth bag ready? Ultrasound measurements of the cervix, the passageway at the entrance to the uterus that opens up to make way for a baby during delivery, can reveal whether labor is likely within the next week, according to a new study. The method is safe, and women already get frequent ultrasound scans during pregnancy , said study co-author Dr. Though most women are given an official due date, it is often just a rough estimate. Only 5 percent of women deliver on their due date, according to American Academy of Pediatrics. A healthy pregnancy is, on average, 40 weeks from the last menstrual period, but in reality, most babies come sometime between 37 and 42 weeks gestation. For many women, that five-week window creates a waiting game that can feel unbearable.

A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date.

Pregnancy math can be a little murky. After all, unless you went the IVF-route, your physician has no way of knowing the exact time of conception. Because of this, pregnancy is calculated from the first day of your last menstrual period or LMP. From that day, weeks of pregnancy is officially counted, and your doc or midwife busts out the red pen and marks your due date on the calendar.

Can a dating scan be wrong

A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures. Dating scans are usually recommended if there is doubt about the validity of the last menstrual period. By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 – 5 days of accuracy. The most accurate time is between 8 and 11 weeks gestation. This is because the fetus is growing so quickly that there is a big difference in size from week to week. However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment. The EDD from the early dating scan is used – if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days. Ultrasound examinations from 12 to 22 weeks are regarded as being within 10 days of accuracy or up to 10 days earlier or 10 days later than the woman’s calculated due date. Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well.

Your pregnancy and baby guide

The use of ultrasound in pregnancy is fairly commonplace. It was originally designed to help monitor the status of complicated or high-risk pregnancies. Today, ultrasounds are considered a standard facet of prenatal care. While ultrasounds can provide doctors and midwives is valuable insights into how a pregnancy is progressing, there are times when the results may either be misleading or inaccurate. An ultrasound technician, known as a sonographer, will look for certain features during the different stages of a pregnancy to determine if things are proceeding as they should. If the technician is unable to find that feature, it may be the sign of a problem. Or not.

3 Reasons Why a Fetal Ultrasound May Be Wrong

Menu Close menu. Back to Your pregnancy and baby guide. In some areas, it may be carried out later than 21 weeks. The anomaly scan is offered to everybody, but you don’t have to have it if you don’t want to. The scan checks for major physical abnormalities in your baby, although it can’t pick up every problem. The anomaly scan is carried out in the same way as the dating scan.

Can your pregnancy scan give the wrong due date?

Don’t forget to look at the how to guide. Discussion in ‘ Pregnancy ‘ started by eightytwo , Jul 28, This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More. Connect with like-minded professionals and have your say on the issues that matter to you.

Dating scan wrong?? You may view most areas of the forum without registering. If you wish to post, you do need to register. It’s FREE! Page 1 of 2 1 2 Last Jump to page: Results 1 to 10 of Has anyone had experience with a dating scan being wrong?

We use cookies to allow us and selected partners to improve your experience and our advertising. By continuing to browse you consent to our use of cookies. You can understand more and change your cookies preferences here. From early pregnancy to the anomaly scan, ultrasounds check that your baby is developing as it should be. When you go for a pregnancy scan, the sonographer a specialist trained in ultrasound scans puts ultrasound gel on your tummy and then moves a handheld probe across your skin. While the gel might be a bit cold, the scans are completely painless.

How accurate is a due date that is determined by ultrasound?