Doctor insights on:
7 Week Gestation Ultrasound
Why is it better to wait until 8 week gestation versus seven weeks gestation in order to have an accurate dating ultrasound?
An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. There are no side effects. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body. In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical ...Read more
Approx 6/28/12: Give or take a few days. Edc is calculated to march 21, 2013. Congrats. ...Read more
Can weeks be different from LMP to what ultrasound shows? I should be 7 weeks and ultrasound show only a gestational sac at 5.3 wks.
Sono better than lmp: There are 2 possibilities. One is that you conceived later than you thought, perhaps due to late ovulation. The other is that the conception failed very early and has stopped growing. At 7 weeks there should be a distinct embryo and fetal heart visible on vaginal scanning. A repeat scan in 7-10 days will show if the 5.3 week sac is developing normally or not. Good luck. ...Read more
Yes. "Accurate".: Ultrasound pregnancy dating scans measure fetal size or age (time since conception), and convert the measurements to human gestational age. Gestational age is calculated by adding 2 weeks to the age of the fetus (to the time since conception), and roughly represents the total weeks since the first day of the last menstrual period (LMP). All dates are ESTIMATES, so 7w 5d means about 7w to 8w 3d. ...Read more
Can a ultrasound in gestational age at 19 weeks be off by + -- 25 days I know it can be off +- 7 to 10 days but what about 25 days?
No: If you had a competent ultrasonographer with a good ultrasound machine, it shouldn't be off by more than 10 days. (Remember that pregnancy dating isn't based on the actual date of conception but is based on the last menstrual period, which is 2 weeks prior to conception. Saying it another way, if the ultrasound says 19 weeks, conception happened 17 weeks prior +/- 10 days.) Best wishes! ...Read more
Ultrasound; Gestational sac at 10 weeks looks 5 times bigger than fetus (which looks 7 weeks) should I be concerned?
Not really: There are several parameters that are measured to follow fetal growth in utero: biparietal diameter, femur length. They don't measure size of fetal sac, so no comparable data available and it's just nonsense to talk about it. ...Read more
Ultrasound says my fetus is 6 weeks 2 days but my gestational sac is 7 weeks 2 days. Heartbeat is normal. Is everything ok?
Most likely: The most accurate measurement of the fetus is the crown rump length. The gestational sac is like a fluid filled balloon, not a perfect sphere. So the measurement of the sac can vary quite a bit depending on what part was measured. If there is already a fetal heart beat, that is a great sign. Keep your follow up appointments with your OB doctor. ...Read more
Do doctors go by gestational age or conception date during ultrasounds? My dates are off by about a week and a half.
Gestational age: Ultrasound is more accurate in determining gestational age than the date of your last period. ...Read more
Which gestational age is more accurate, LMP based or ultrasound one? By LMP I am 27weeks and 4 days. Ultrasound says 28 weeks
How acurate is an ultrasound done at 14w3d. How many days/weeks can the ultrasound before off by when determining gestation.
They: Are fairly accurate, most accurate dating at 6weeks. ...Read more
Would the gestational age of 12wks+4days @62mm be off by 1 week since ultrasounds have a margin of error of 1 week in the first trimester?
Estimates: Determination of gestational age is based on estimates determined by the last menstrual period and ultrasound. There is a margin of error with ultrasound, but that does not mean that the gestational age is necessarily different by a week. It means that the ultrasound estimate is 12w4d with a very high likelihood that the actual age is between 11+ to 13+ weeks. ...Read more
Ok, so I had an ultrasound at 15/16 weeks. The tech said the baby was small compared to the gestational sac, so they couldn't date it. Is this bad?
Get clarification: No, it's not bad. In the first trimester fetal size (crown-rump length) beats gs measurement every time for accuracy. In the 2nd trimester fetal biometry is important (bpd, abdominal circumference, femur length,) not sac size. ...Read more
Hi there, We had our first ultrasound today at 9 weeks 2 days. The baby is measuring (crown to rump) an accurate 9w2d, but the gestational sac is 8?
Many results of US: There r many measurements that r taken during the trimester ultrasounds (US) to help gauge how the fetus is progressing. None of the measurements are 100% accurate. Doctors use the battery to get an idea of how well the fetus is growing. No 1 measurement is supreme; u have to take them all in context. If ur OB is not worried abt the US, u shd not worry. Congrats, & thanks for asking HealthTap! ...Read more
No: First trimester ultrasounds are the most accurate for estimating gestational age within +/- 7 days. ...Read more
Not likely: A 7-8 week vaginal sono should be within a week of the actual date of conception plus 2 weeks. The gestational age is expressed as weeks since last menstrual period (lmp) and assumes conception 2 weeks later. If you are 4 weeks less than expected you conceived one cycle later. Due date is an estimate of 40 weeks since the LMP and assumes you will carry full term and not be late or preterm. ...Read more
Sex with guy a jan 19 sex with guy b jan - present. Believed LMP 2/5. Ultrasound on 4/1 estimated gestational age of 7 weeks. Who is the father?
Bachelor B: An LMP during the second week of February matches the April 1st dating ultrasound that gave an estimated gestational age of 7 weeks. These numbers give an estimated date of conception around February 20-25, so the winner is Bachelor B! ...Read more
About 7 days: First trimester ultrasounds are the most accurate, but a 13 week ultrasound should be quite good at estimating the due date. Best of luck! ...Read more
Probably not: Not likely to see a gestational sac that early. ...Read more
Is a gestational age reading accurate on a 10 week ultrasound? And what exactly are they measuring?
My LMP is 26-5-2017, but today my ultrasound shows gestational age of 5 weeks and 6 days... is it normal?
Yes it can be: Normal - you may have been fertilized right before your menstrual period in June was due - so that would put the conception 5-6 weeks ago. I would not worry about the gestational age, be ecstatic for yourself and your partner and the wonderful child that is coming to this world. Thanks for trusting in HealthTap. ...Read more
Plus/ minus 2 weeks: A single ultrasound for dating is only good to estimate gestational age within 10 days to 2 weeks. Serial ultrasounds tend to be much more accurate. ...Read more
Natural fluctuation: Woman's ovulatory cycle is on lunar calender. So the gap builds up with regular calender calculation. ...Read more
What did your OB say: Your OB should ahve told you that was normal! You will need a followup us because you should be able to see a ht beat at approx 6 1/2 weeks. ...Read more
Hard to say: Without actually looking at the ultrasound, it is nearly impossible to say what it is you are looking at. I will presume that at this very early stage it may be the fetus. You will still need a follow up visit to see better the anatomy of the fetus ...Read more
My Beta hCG came back at 788 at exactly 5 weeks today... My ultrasound showed a gestational sac at approximately 4mm big. Is this normal?
Went to my ob today and he did an ultrasound and for 4.5 weeks we didn't see anythig?! is that bad? I thought u c a gestational sac at this stage?
Early OB ultrasound: With standard transabdominal ultrasound, radiologists can see a gestational sac around the 5-6 week mark. Before the 5-6 week mark, it's not unusual to not see a sac or fetal pole. If nothing is seen, this could mean a couple of things. Most likely a very early pregnancy (with positive beta hcg). The thing to do is consult ob, followup serial beta hcg, and followup OB ultrasound in 2-3 weeks. ...Read more
My hCG yesterday was 778. I also had an ultrasound done at the same time. It showed a gestational sac measuring approximately 4mm. Is this normal at 4 weeks and 6 days (currently 5 weeks)?
Too early to tell: Too early to tell. Need repeat hcg few times. The number should double every two days. Bottom line is not until 9 weeks from 28day cycle to be sure Most miscarriage happen before 9 weeks. Good luck. Should be on prenatal vitamin now. And beware of cold flu and other environmental toxins exposure ...Read more
Recently went to the the doctor they did a ultrasound found 2 gestational sac one 7 weeks one 5 weeks but doctor said no baby in them and I miscarrY?
When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more
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