How Accurate Is Ultrasound For Weight? The study measured the weight of 188 fetuses ranging from 20 weeks and 42 weeks gestation. The second scan helps to determine if there have been any changes in your baby’s growth. If your care provider has already declared your baby to be ‘big’ before birth, it is more likely you will go into labour with a set of preconceived ideas about giving birth to a big baby. mine was pretty accurate. A common question a pregnant woman might type into a search engine is: Can an ultrasound tell me how big my baby is? I got to have an ultrasound done this morning at 36 weeks 4 days to measure baby, as based on my belly measurements he's been 2-3 weeks ahead the past couple of months. She was born almost 4 weeks later at 5lbs 4oz. I had one at 39 weeks that showed my baby measuring 10+ lbs. This is the longest bone in the body and can be different lengths in babies of different weights, so is not always reliable. Women were recruited from the antenatal clinics and offered the 37‐week scan and those attending for this study, which was approved by the ethics committees of the hospitals, gave written informed consent. Accuracy of the EFW is reported to be best when examinations are performed within 7 days before delivery [38]. No one cat tell. Hi everyone, my little one is here. My doc said my LO would be 6.5 lbs he was 8 lb 11 oz. Around week 20, an ultrasound might be used to detect fetal abnormalities. ... including 606 preterm (<37 weeks) and 1690 term deliveries. Born 37 week 1 day at 4 lbs 8 oz. Are you sure you want to delete your discussion? They typically say the ultrasounds can be off 1lb either way. unless you're having a girl with a penis or a boy with a vagina I don't think it's hard for them to tell at 36 weeks if your baby's genitals are male or female. Babies of similar weights can have different head sizes, so this data is not always reliable later in pregnancy, Abdominal circumference, which most accurately reflects baby’s size. How Accurate Is Ultrasound For Measuring Baby’s Weight? Conclusion: Sonograms between 34.0 and 36. It’s important to know there is a recognised 15% error in ultrasound fetal weight estimation. At 36 weeks baby was measuring 85th percentile of 7lb2oz. PMID: 23132481 im 36 weeks does anybody else thinks this is a problem?? Around week 20, an ultrasound might be used to detect fetal abnormalities. Most commonly, an ultrasound scan will be performed, and then another 2-3 weeks later. At 38 weeks the ultrasound estimate was 7 lbs even. Increased pelvic discomfort: Baby is down low within the pelvis, the pressure is bigger as the baby keeps … Ruby is my second, she was born after cervical gel was applied and I started contractions within hours. If you and your baby are happy and healthy, there should be no reason to worry about how much your baby will weigh at birth. New Reply Follow New Topic. Anonymous wrote:Ultrasound weight estimates are ridiculously inaccurate. In The News: First Clinic For Pregnant Women With Disabilities Opens, Doctors Are Seeing More PCOS Women With Endometrial Cancer, 5 Food Items That Maintain a Normal Menstrual Cycle, 5 Signs That Say You’re Eating Too Much Sugar. Baby weight accuracy of Ultrasound: I had an us today at 36 weeks and they said baby weighed approx 2.9 kg. The aim of this study was to determine the accuracy of established ultrasound EFW formulae to identify small and large for gestational age fetuses when used after 35 weeks gestation. so pretty accurate for me OBJECTIVES Late onset fetal growth restriction is often missed and is responsible for most intrauterine deaths. At 38 weeks the ultrasound estimate was 7 lbs even. National implementation of a rigorous audit programme would likely improve accuracy further, and … Almost all the formulae overestimated the fetal weight in low birthweight babies whilst underestimating the fetal weight in birthweight >3500g. The aim of this study was to determine the accuracy of established ultrasound EFW formulae to identify small and large for gestational age fetuses when used after 35 weeks … Thoughts? New Reply Follow New Topic. He was born at 40w2d and was only 8 lbs. There are many different mathematical formulae for estimating fetal weight; most of them were devised in the 1980s. All EFW formulae either under or over estimated the birthweight in singleton pregnancies. Comparison with the birth‐weight chart showed that the EFW was noticeably larger at 25–36 weeks' gestation. I just came back from my 35 Week ultrasound and was told that the baby's weight is around 6.14 Lbs., which puts the baby in the 80th percentile. 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