Ultrasound Precision for Pregnancy Issues


I’m 38 weeks and getting an ultrasound to see how big my baby is. How accurate is this?

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

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How accurate are ultrasounds in determining the size of a baby?

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Your First OB Ultrasound | Oakdale OBGYN

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Ultrasound Accuracy for Pregnancy Issues Determining a Due Date. It’s a question that’s obviously on the top of every expectant mother’s mind: When am I due? Detecting the Fetal Heartbeat. Ultrasounds can detect a fetal heartbeat in pregnancies beyond 7 to 8 weeks.

But during Diagnosing a. A prenatal ultrasound can be done in one of two ways transabdominally (over your belly) or transvaginally (into your vagina). You may get a transvaginal ultrasound if it’s very early in your.

Accuracy in Detecting Birth Defects Congenital defects, both major and minor, occur in around three percent of all births. Of these, roughly three out of four will be detected by ultrasound. The accuracy of these tests, however, is closely related to the stage and type of pregnancy involved.

How Accurate is an Ultrasound for Size, Gender, and Heartbeat? Permitting that your pregnancy is at least seven to eight weeks along in gestational age, an ultrasound should always detect the baby’s heartbeat. The only time when the heartbeat. The accuracy of the EDD by ultrasound depends on several factors such as the current stage of pregnancy, the quality of the machine, and the position of the baby in the mother’s womb. Therefore, it is safe to say that the accuracy of the ultrasound decreases as the pregnancy progresses.

Hence ultrasounds cannot be 100 percent correct and reliable. You may have an ultrasound between 18 to 20 weeks to evaluate dates, a multiples pregnancy, placenta location or complications. It may also be possible to determine the gender of your baby during this test. Several factors, such as the stage of pregnancy and position of the fetus, will influence the accuracy of the gender prediction. This ultrasound can be especially helpful in diagnosing any suspected problems during your pregnancy.

A 3-D ultrasound follows the same procedure as a standard ultrasound. All medical procedures have risk. But, there’s no evidence to show a prenatal ultrasound done properly will harm a mother or her unborn child. Done properly means it’s performed by a. In terms of dating, the ultrasound’s accuracy depends on the trimester, explains Kara Manglani, CNM, a nurse-midwife practicing in New York City and blogging at.

These screening methods are less accurate and are performed between 15-20 weeks. The blood screen measures two pregnancy-related hormones: hCG and PAPP-A. The ultrasound evaluation measures the nuchal translucency (fluid beneath the skin behind the baby’s neck).

List of related literature:

Ultrasound has a level of uncertainty that increases during the pregnancy but it is rarely off by more than 7% to 8% at any GA.

“Blueprints Obstetrics and Gynecology” by Tamara L. Callahan, Aaron B. Caughey
from Blueprints Obstetrics and Gynecology
by Tamara L. Callahan, Aaron B. Caughey
Wolters Kluwer Health/Lippincott William & Wilkins, 2009

There are limits to the accuracy of ultrasound.

“Manual of Diagnostic Ultrasound” by Philip E. S. Palmer, Organisation mondiale de la santé, World Health Organization, World Federation for Ultrasound in Medicine and Biology
from Manual of Diagnostic Ultrasound
by Philip E. S. Palmer, Organisation mondiale de la santé, et. al.
World Health Organization, 1995

This ultrasound may be used to establish the duration of pregnancy if the woman cannot give a precise date for her LMP or if the size of the uterus does not conform to the EDB as calculated by Nägele’s rule.

“Maternal Child Nursing Care in Canada E-Book” by Shannon E. Perry, Marilyn J. Hockenberry, Deitra Leonard Lowdermilk, Lisa Keenan-Lindsay, David Wilson, Cheryl A. Sams
from Maternal Child Nursing Care in Canada E-Book
by Shannon E. Perry, Marilyn J. Hockenberry, et. al.
Elsevier Health Sciences, 2016

Some authors recommend ultrasound estimation as the first choice for dating all pregnancies; others have voiced reservations about exclusive use of EUS estimates.

“Joints and Connective Tissues: General Practice: The Integrative Approach Series” by Kerryn Phelps, Craig Hassed
from Joints and Connective Tissues: General Practice: The Integrative Approach Series
by Kerryn Phelps, Craig Hassed
Elsevier Health Sciences APAC, 2012

Most obstetric units use a combination of the LMP and dating based on ultrasound fetal biometry, only favouring the ultrasound dates if the discrepancy is greater than 7, 10 or 14 days depending on gestational age at first ultrasound scan.

“Rennie & Roberton's Textbook of Neonatology E-Book” by Janet M. Rennie
from Rennie & Roberton’s Textbook of Neonatology E-Book
by Janet M. Rennie
Elsevier Health Sciences, 2012

Recognizing that most women are receiving ultrasounds at some time in their pregnancy, the following question arises: What should be done if there is a discrepancy in the clinical dates (based on LMP) and the ultrasound dates?

“Obstetrics: Normal and Problem Pregnancies E-Book” by Steven G. Gabbe, Jennifer R. Niebyl, Henry L Galan, Eric R. M. Jauniaux, Mark B Landon, Joe Leigh Simpson, Deborah A Driscoll
from Obstetrics: Normal and Problem Pregnancies E-Book
by Steven G. Gabbe, Jennifer R. Niebyl, et. al.
Elsevier Health Sciences, 2016

In most cases, ultrasound is generally considered to be quite accurate when performed by a skilled technician.

“The Mother of All Pregnancy Books: An All-Canadian Guide to Conception, Birth and Everything In Between” by Ann Douglas
from The Mother of All Pregnancy Books: An All-Canadian Guide to Conception, Birth and Everything In Between
by Ann Douglas
Wiley, 2011

It is important to consider that the lack of fluid affects the accuracy of ultrasound measurements and the gestational age is frequently underestimated (O’Keefe et al., 1985).

“Practical Guide to High Risk Pregnancy and Delivery E-Book” by Fernando Arias, Amarnath G Bhide, Arulkumaran S, Kaizad Damania, Shirish N Daftary
from Practical Guide to High Risk Pregnancy and Delivery E-Book
by Fernando Arias, Amarnath G Bhide, et. al.
Elsevier Health Sciences, 2012

Early ultrasound scans performed before 12 weeks are accurate for dating within 1 week.

“ASTNA Patient Transport E-Book: Principles and Practice” by ASTNA, Renee S. Holleran
from ASTNA Patient Transport E-Book: Principles and Practice
by ASTNA, Renee S. Holleran
Elsevier Health Sciences, 2009

Ultrasound is more accurate, provided that gestational age has been correctly estimated early in pregnancy.

“Crash Course Obstetrics and Gynaecology” by Sophie Kay, Charlotte Jean Sandhu, Shreelata T Datta, Philip Xiu, Ruma Dutta, Fevzi Shakir
from Crash Course Obstetrics and Gynaecology
by Sophie Kay, Charlotte Jean Sandhu, et. al.
Elsevier Health Sciences, 2019

Oktay Kutluk

Kutluk Oktay, MD, FACOG is one of the world's foremost experts in fertility preservation as well as ovarian stimulation and in vitro fertilization for infertility treatments. He developed and performed the world's first ovarian transplantation procedures as well as pioneered new ovarian stimulation protocols for embryo and oocyte freezing for breast and endometrial cancer patients.

Mail: [email protected]
Telephone: +1 (877) 492-3666

Biography: https://medicine.yale.edu/profile/kutluk_oktay/
Bibliography: oktay_bibliography

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  • Wow I’m so glad I came across your videos. You explain things so concisely and precisely and give the right and enough information needed. Out of all the YouTube videos your have been straight to the point and great to watch. I don’t have time for a long intro etc. Keep it up

  • I went to my 7 week ultrasound at 7 weeks and 2 days and it was measuring 6 weeks and 3 or 4 days with a heartbeat. Should I be worried?

  • My last period was Jan.5 2020 i usually have irregular cycles because of PCOS. I track my cycles to have an idea of when i might ovulate using OPKS. This last period i had 2 LH surges days apart (never happened before) One very dark positive on the 19. The other i had on the 24, 25, 26 very dark as well. So im not sure which date i ovulated. But my first trimester ultrasounds starting from 4.5-8 weeks have given me EDD Oct 24, 18, 21, 22 in this order according to week of pregnancy. But my 20 week anatomy scan through me off by giving me EDD OCT 12!!! But seems to me they are going by my lmp, technician said my baby was measuring close to my last period which is very confusing. My first ultrasounds was a very different story tech telling me i was not as far along as obgyn had thought. My doctor thought i was 6 weeks when i had my first ultrasound done it showed I was about 4.5. Im so confused!!! Which due date should i beleive??

  • I went in for my first ultrasound and I’m measuring two weeks behind I’ve done research and I’m mostly finding the answer that my baby has stopped growing.. what could be going on??

  • It’s been 5 years I’m married n I had my 3rd misscrriage few days ago and doctor recommended me karotyping test is it right way to find the reason behind the misscrriages? Please reply doctor

  • Good morning,
    I have a question. I am 35 weeks 3 days gestation. I had an OBGYN appt. on Friday and asked my Dr. about some cervical pain I was feeling which started on Wednesday and has been on and off since then as well as some really bad joint pain which honestly feels like my leg might break off near the pelvic area. The pain is at the point it’s hard to get up from bed or sne sitting/laying position I am in. I’ve been having some intense pains and since I am really not sure if it’s contractions or not I haven’t kept track to the length or how often they have been. I even feel pain down there and have had headaches. is this actually normal? He didn’t check if I was dilated or not he just did an ultrasound and said everything was good. should I be concerned?

  • hi i have a question.my last period was october 13.i did ultrasound november 15.report says baby 2 weeks old so can u tell me what would be my due date.

  • This should be done before you get pregnant so you can not have children that are born with missing limbs or life in pairing birth defects if you have any yourself you should not have children for the children’s sake they will never have a normal life I have scoliosis and a bad back because of it I chose not to pass this on to Children Of Mine so I don’t have any more humane

  • Hi! I have s question,
    I had my second csection 7 weeks ago and for about 2 weeks now I’ve been broken out in very itchy hives all over my legs. My Dr said its postpartum hives and has given me medication that I’ve taken, but I’m still experiencing the hives. I looked it up online to see if I can get any sort of information and I read about PUPPS. Can you tell me more about that, and if that’s possibly what’s going on with me, thank you!

  • I think they did this for me making sure the baby brain was fine and something else I don’t know, question for you can you do a DNA test before the baby is received?

  • I have a question, I had an early ultrasound done at 11 weeks and they said my due date was at December 8th then I proceeded to have a ultrasound done at week 20 for the anatomy scanand. they change my due date again to December 9th and now I’m 25 weeks and they’re saying that to my due date is going to be December 10th why is my due date changing? During my anatomy scan at 20 weeks they proceeded to say that my son is in the 17th percentile of being small does that have something to do with the due date being changed?

  • Hi nurse Dani.
    Question…. I took 5 pregnancy test and all positive then went to the doctor and also positive about a week n a half I went and then they said I was not pregnant.. what could be the reason?

  • hey, was wondering if you could do a video on my question:
    I turned 15 a week ago and I’m like 5’3-5’4 max and my dad is 5’6-5’7 max and mum 5’5-5’6 max.
    Any hope lol?