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Nuchal translucency 1.5 mm at 12 weeks

Normal reference range of fetal nuchal translucency

The median NT thickness for GA were 1.0 mm, 1.2 mm, and 1.4 mm for gestational age of 11 weeks, 12 weeks, and 13 weeks, respectively, and the 95th percentiles of NT thickness were 1.8, 1.9, and 2.2 for gestational age of 11 weeks, 12 weeks, and 13 weeks, respectively. The distribution of the NT thickness for CRL has been reported in many studies The nuchal translucency scan is best done during the 12th week, but it can be done from 11 weeks and 3 days up until 14 weeks and your local NHS hospital will offer you an appointment to have this done at around this time. Nevertheless, some parents may opt to have this done privately instead

Thickness of the translucency varies with gestational age: Peak thickness at 12-13 weeks (in 75% of fetuses). At 12-13 weeks the 50th percentile thickness = 1.7mm. At 12-13 weeks the 95th percentile thickness = 2.8mm. Most authors use a thickness of ³ 3 mm to define abnormal (some authors use 2.5mm) In general, most doctors consider a normal screening NT measurement at 12 weeks to be under 3 mm. Who should get a nuchal translucency screening? A nuchal translucency screen is recommended for all pregnant women and is often one of several routine prenatal tests during the first trimester About 90% of fetuses with a nuchal translucency measurement of 3 mm (high) at 12 weeks' gestation are normal at birth, while 10% have major abnormalities. Only 10% of babies with a measurement of 6 mm (very high) at this time will be found to be normal. Similar Asks NT below 3mm is considered normal between the gestation weeks 11 and 14, and CRL between 45 and 84mm. Ideally, the thickness of nuchal translucency increases with the CRL. To be more precise, the normal NT ranges from 1.2 to 2.1mm when the CRL is 45mm. And when the CRL is 84mm, the normal NT range is from 1.9 to 2.7mm I had a high nuchal fold result at 12 weeks, but good bloods results so was told to wait until 20 weeks and have the baby's heart checked. It was the most stressful 8 weeks, but luckily nothing could be found at 20 weeks and we were given the all clear. Baby is very healthy and 11 months now

Nuchal translucency scan - 12 week scan, down's syndrome

Nuchal translucency (NT) thickness measured at 11-14 weeks' gestation is the most effective single marker for trisomy 21. Therefore, a standard technique in measuring NT is extremely important. NT increases with gestational age and therefore with CRL measurement 1, by c. 20% per week 2, 3 I'm curious to see what risk you were given after your nuchal test. This is my second baby and was measured at 1.8mm at 12.4 weeks. But my previous baby was only 0.6mm at 11.5 weeks. I can't help feeling slightly concerned that its not similar to last time. Although I know 1.8mm is supposed to be ok. Got a week to wait until results come in c. chloetp. Aug 17, 2018 at 5:00 PM. I'm 22 and I had my 20 week scan a week ago, I then seen the dr and they told me that the nuchal fold thickness has come back a bit over 7mm and my baby could possibly have down syndrome (everything else came back fine).. I've been worried sick for over a week now it's all I think about Enter the CRL and press calculate to obtain the estimated gestational age and expected nuchal translucency thickness. The calculator will also give the percentile for a measured NT if entered for CRL 40 to 85 mm. Enter crown rump length (CRL) mm. Enter Nuchal translucency ( NT) mm : All calculations must be confirmed before use. The suggested.

Normal Values for the Nuchal Translucency and Technique

Nuchal Translucency Test — What to Know About Screening

Nuchal translucency (NT) is the normal fluid-filled subcutaneous space that can be measured by ultrasound imaging between GA week 11 to 14 and is used as a diagnostic soft marker, a measured increase in this space can relate to Trisomy 21 and other neural and chromosomal conditions in the fetus. The normal range of Nuchal Translucency at 13 to 14 GA weeks is 1.6 - 2.4 mm Pregnancies where the nuchal translucency measurement is between about 2.5 and 3.5 mm are in an intermediate-risk group, and for these women, a genetic sonogram at about 18 weeks into the pregnancy plus a detailed sonogram of the heart (called a fetal echocardiogram) at about 22 weeks are recommended. Women with a nuchal translucency. In 13th week of pregnancy. Answer: Yes, it is normal, I ve same NT 1.1 mm and my doctor told it is absolutely normal, so don't worry njoy ur pregnancy. Question: Nuchal translucency is 2.6mm (92 centrile).meaning of this ? Answer: Congratulations for pregnancy dear NT ultrasound is an ultrasound screening tool that is used to check the level. hi, im 14 weeks preg and had a nuchal test on monday, nuchal was 1.82 mm which seemed normal but bloods put me at high risk group of 1 in 100-150. they have rec cvs which i went for today but because im on tinzaparin injections they wont do it until next week so i dont do my inject on that day. naturally im anxious as ive had 4 previous mc and. The median nuchal translucency measurement increased from 0.7 mm at 10 weeks' gestation to 1.5 mm at 13 weeks. A nuchal translucency measurement greater than 2.5 mm was found in 4.6% of the fetuses at 10 weeks' gestation; the incidence increased to 8.7% at 14 weeks

Nuchal translucency is a collection of fluid under the skin at the back of your baby's neck. The amount of fluid is measured during a nuchal translucency (NT) ultrasound scan: between 11 weeks and 14 weeks of pregnancy. or when your baby measures between 45mm (1.8in) and 84mm (3.3in 45-84) mm and the median gestation was 12 (range, 11-13) weeks. Both operators easily identified the fourth ventricle in all cases. The anteroposterior diameter of the fourth ventricle increased linearly with gestation from a median of 1.5 mm at a CRL of 45 mm to 2.5 mm at 84 mm (r = 0.736, P < 0.0001; Figure 2) 1 INTRODUCTION. Nuchal translucency (NT) ≥3.5 mm (>p99) is a well-recognized indication for invasive testing as it is a well-studied ultrasound marker for common and uncommon aneuploidies as well as for a wide variety of genetic syndromes and structural anomalies. 1-6 Although Kagan et al have previously shown that fetuses with NT of 95th centile ≥3.4 mm have a high risk for chromosomal. Nuchal fold thickness of >6 mm is abnormal on a routine morphology ultrasound performed at 18-22 weeks. The nuchal fold is known to increase throughout the second trimester in a normal pregnancy, and may be measured during a broader window of 14 and 24 weeks when required

At 12 weeks of gestational age, an average nuchal thickness of 2.18mm has been observed; however, up to 13% of chromosomally normal fetuses present with a nuchal translucency of greater than 2.5mm. Thus for even greater accuracy of predicting risks, the outcome of the nuchal scan may be combined with the results of simultaneous maternal blood. I am 13 weeks pregnant and went for an nuchal translucency, which came out at 2.2mm in thickness which the doctor said is thicker than normal? 1 doctor answer • 4 doctors weighed in Nuchal translucency measured 2mm then the next day at a different dr's office, it was 0.4mm Nuchal translucency (NT) is a collection of fluid under the skin at the back of your baby's neck. The amount of fluid is measured during an NT ultrasound scan: between 11 weeks and 13 weeks plus six days of pregnancy. or when your baby measures between 45mm and 84mm, crown to rump. (ASUM 2018, DH 2018, Nicolaides 2011, PHE 2018, UK NSC 2016. For example, a CRL of 23 mm would correspond to a gestational age of 9 weeks and two days (6 weeks plus 23 days = 9 weeks and 2 days). Accuracy of CRL after 12 weeks in predicting gestational age diminishes and is replaced by measurement of the width of the fetal head (biparietal diameter or BPD). What is the Nuchal Translucency At 12 weeks of gestational age, an 'average' nuchal thickness of 2.18mm has been observed; however, up to 13% of chromosomally normal fetuses present with a nuchal translucency of greater than 2.5mm

The NT ultrasound is done between 11 and 13 weeks, when baby's nuchal translucency, the clear tissue located at the back of a developing baby's neck, can be measured. An average NT measurement is around 2.18 millimeters. Indications of a higher NT measurement during assessment increase the potential risk of fetal abnormalities being present krisleigh625. Jul 23, 2017 at 8:32 AM. at 19 weeks I think my little guys nuchal fold was close to 8mm. that, along with extremely short long bones, what they thought was a clubfoot, and a spine defect they told us he most likely had trisomy 13 or 18 and would not survive to birth. I have birth on May 4th to a perfectly healthy little boy undergone a scan (Antenatal ultrasound ) on her 14 weeks and 4 days . In the findings, Nuchal translucency is 2.1 mm . we were worried as we checked with one of the doctor who told us this is not normal and baby. Hi I have had a nuchal scan & bloods on 20/12/07 at 11 weeks and 5 days. Results were: 1.2mm nuchal measurement 1 : 4,638 for T21 1 : 14,843 for T18/T13 (even taking into account my first pregnancy ba read mor Had my 12 week nuchal ultrasound, the diameter was 0.25.5 cm is this okay or is this a high risk? Thanks . (mm/cm) in order for the nuchal translucency (ips) ultrasound to be performed? 1 doctor answer • 1 doctor weighed in. A 30-year-old male asked: Is it safe to have an elective ultrasound at 14 weeks while extended family is in town? I.

Nuchal translucency alone is about 75% accurate, but if it is combined with a blood test, this increases the accuracy of up to 85% to 90%. This means that around 10 to 15% of babies with a genetic disorder such as Down Syndrome will be missed, meaning the woman will be estimated as 'low risk' and yet still carry a baby with a genetic disorder 8mm Nuchal Translucency Ultrasound. I've just had my ultrasound scan at 13 weeks and everything was going fine, the baby was moving and the Sonographer was pointing out all the different body parts to us and then suddenly the Sonographer advised us that the fluid behind the baby's neck is 8 mm which is much higher than normal (up to about 3.5. For example, in a 20-year-old woman at 20 weeks of gestation (background risk of 1 in 1295), who had a 11-14 week assessment by nuchal translucency measurement that resulted in a 5-fold reduction in risk (to about 1 in 6475), after the diagnosis of mild hydronephrosis at the 20-week scan, the estimated risk has increased by a factor of 1.5 to. the scan takes place between 10 and 14 weeks of pregnancy; The screening test for Down's syndrome used at this stage of pregnancy is called the combined test. It involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan. This is sometimes called a nuchal translucency scan Nuchal translucency at 4mm (+high risk for Down's). Worried! (RESOLVED) Hi everyone.. This is my first pregnancy (I'm 29 y.o). Just got back from my scan (done at 11 weeks 5 days), had the nuchal translucency measurement done and it measured 4mm. Other than that, everything was fine, heart rate, CRL, head diameter, femur length, abdominal.

Nuchal translucency (NT) is the sonographic appearance of a collection of fluid under the skin behind the fetal neck in the first-trimester of pregnancy. Nuchal translucency scan is used as a screening, rather than diagnostic, tool for conditions. First trimester screening is a prenatal test that offers early information about a baby's risk of certain chromosomal conditions — Down syndrome (trisomy 21) and extra sequences of chromosome 18 (trisomy 18) Normal results for Nuchal Translucency. The normal amount of fluid found at the back of the fetal neck during an ultrasound procedure signifies that the baby is unlikely to develop Down syndrome or any other genetic problems. Normal measurement at 11 weeks age of gestation is up to 2mm. Normal measurement at 13 weeks, 6 days age of gestation is.

Nuchal translucency is a fluid-filled space behind the neck of a fetus. Nuchal translucency scan is commonly known as NT scan, and it is done to check the size of Nuchal translucency during 11 to 13 weeks of pregnancy.The test is used to screen for Down Syndrome or any other chromosomal abnormalities.. Normally all developing fetus have fluid behind their neck Abnormal nuchal thickness (≥ 3 mm) was 1.5% (5/340) and was significantly predominant in mothers aged over 36 years. In 8.8% (30/340) of cases, nuchal translucency was absent among which 46.7% (14/30) were examined before 13 weeks of gestation. CONCLUSION The prevalence of abnormal nuchal translucency thickness is 1.5% in our setting and is.

Nuchal Translucency scan 2.2mm. Yesterday I had my 12 week nuchal translucency scan, and it showed normal results for the nasal bone, but then 2.2mm for the nuchal translucency. I am currently 12+3days. We've opted to do the Panorama DNA blood screen, though results take 7-12 days to come back. In the meantime I've been freaking out, and of. #6: What is a normal nuchal translucency measurement at 12 weeks? The sonographer measures the size of the nuchal fold to see if the amount of fluid is normal or excessive. A normal nuchal translucency will measure less than 3.5 mm when your baby measures between 45 mm and 84 mm

What is a normal nuchal translucency measurement at 12 weeks

Nuchal Translucency Scan (NT Scan): Normal Range

Worried about an increased nuchal translucency thickness

  1. When the values above the 97th percentile for NT thickness were accepted as pathological values, pathological values for 11-11 +6, 12-12 +6, and 13-13 +6 weeks of gestation were calculated as 3.10 mm, 3.20 mm, and 3.30 mm, respectively (Table 1). At the gestational age of 11-14 weeks, the reference values for the 99th percentile were.
  2. A nuchal translucency ultrasound (commonly called a nuchal scan or NT scan) is an ultrasound performed between 11.5 and 13 weeks 6 days gestation. It is usually part of an assessment called combined first trimester screening. Combined first trimester screenings
  3. 4 When a scan shows a nuchal translucency (NT) measurement of 3.5millimetres or more Information for parents Definitions Nuchal translucency (NT) scan You will have an NT scan when you are between 11 weeks and 2 days and 14 weeks and 1 day pregnant. The NT scan measures the thickness of the fluid at the back of your baby's neck
  4. Normal nuchal translucency is defined as a measurement less than 3 mm, if the 95th percentile is used or 3.5 mm, if the 99th percentile is chosen . Nuchal translucency increases with increasing gestational age and higher measurements are associated with greater risk of abnormality [ 73 ]
  5. The median nuchal translucency measurement increased from 0.7 mm at 10 weeks' gestation to 1.5 mm at 13 weeks. A nuchal translucency measurement greater than 2.5 mm was found in 4.6% of the.
  6. ation has become extremely important in the early diagnosis of congenital anomalies and chromosomal disorders. Combined with 1st trimester biochemistry, it is the most sensitive, non-invasive risk assessment for aneuploidy currently available in Australia. The test should be preceded by appropriate.
  7. Nuchal translucency of 3 mm or more or cystic hygroma was detected in a total of 76 fetuses (0.8 percent); the frequency of these findings decreased from 1.8 percent at 10 to 10.9 weeks of.

Nuchal translucency measurement are done as follow: *Gestational period must be 11 weeks to 13 weeks and 6 days. *Fetal crown-rump length should be between 45 mm to 84 mm. *Magnification of the image should be as follow, the fetal head and thorax occupy the whole screen. *The presence of the nasal bone, the rectangular shape of the palate. 90 answers /. Last post: 10/15/2020 at 3:16 PM. Kelly C (966) 1/11/2017 at 8:38 PM. I have just had my 12 week scan and been advised baby has a nuchal translucency of 6mm and so is high risk for chromosome or other disorder. I have had my CVS test today but am told that even if those results come back clear there may be other abnormalities Average Nuchal Translucency Measurement. Nuchal translucency (NT) refers to the clear tissue space at the back of a developing fetus's neck. The NT is measured during ultrasonography performed between gestational weeks 11-14. Once the technician has found the nuchal fold, they use a caliper tool to measure the the NT as it appears on the screen The median nuchal translucency measurement increased from 0.7 mm at 10 weeks' gestation to 1.5 mm at 13 weeks. A nuchal translucency measurement greater than 2.5 mm was found in 4.6% of the fetuses at 10 weeks' gestation; the incidence increased to 8.7% at 14 weeks. Conclusion In normal fetuses, there is a physiologic variation in the nuchal.

Repeat measurements of nuchal translucency at 11-14 weeks

  1. Transverse suboccipitobregmatic sections of the fetal head demonstrating the presence of septated sonolucency in fetuses with nuchal translucency thickness between 2 mm and 10 mm in thickness at 11-13 6/7 weeks of gestation. The arrows point to the septations.Molina. Nuchal Translucency and Cystic Hygromas. Obstet Gynecol 2006
  2. A nuchal translucency scan (also called an NT or nuchal scan) uses ultrasound to assess your baby's risk of having Down syndrome and some other chromosomal abnormalities, as well as major congenital heart problems. You may be offered a nuchal scan as part of your prenatal screening. (Audibert et al 2017, Chitayat et al 2017, Morrison et al.
  3. The nuchal translucency measurement was expressed as the median and fifth, 25th, 75th, and 95th percentiles according to completed weeks of gestation based on ultrasound measurements. RESULTS: The median nuchal translucency measurement increased from 0.7 mm at 10 weeks' gestation to 1.5 mm at 13 weeks
  4. Chromosomal defects and outcome in 1015 fetuses with increased nuchal translucency. Ultrasound Obstet Gynecol. 1995; 5(1) : 15 -9 12. Snijders RJ, Noble P, Sebire N, Souka A, Nicolaides KH. UK multicentre project on assessment of risk of trisomy 21 by maternal age and fetal nuchal-translucency thickness at 10-14 weeks of gestation

The fetal pole grows at a rate of about 1 mm a day, starting at the 6th week of gestational age. Thus, a simple and accurate way to date the fetus in an early pregnancy is to add the length of the fetal pole (in mm) to 6 weeks. Using this method, a fetal pole measuring 5 mm would have a gestational age of 6 weeks and 5 days. Week 6 Fetal. Nuchal Translucency Scan (or 12 Week Scan) at The Birth Company in Harley Street, London. Here the fetus can be seen in detail. The scan confirms that ther.. Limitations of using first-trimester nuchal translucency measurement in routine screening for major congenital heart defects. Ultrasound in Obstetrics and Gynecology, 2001. Basky Thilaganathan. Download PDF. Download Full PDF Package. This paper. A short summary of this paper The nuchal translucency (NT) refers to the pocket of fluid at the back of the fetal neck. The measurement of the nuchal translucency is part of the combined screening test for trisomy 21 and trisomy 18, called enhanced First Trimester Screen (eFTS). An increased NT measurement increases the chance for other chromosome differences, additional genetic conditions, and can also be helpful to.

Nuchal thickness - what was your risk? Mumsne

This scan is better known as the 12 week scan (although it can be carried out anywhere between weeks 11 and 13). It is a special ultrasound scan which is performed to specifically measure a tiny bit of fluid that lies under the baby's skin behind the neck known as the nuchal translucency (NT) Nuchal Translucency (NT) If the crown rump length is 60 mm, then the Expected nuchal translucency is 1.61 mm, predicted gestational age is 12 weeks, 3 days If the measured NT is 2 mm for the CRL 60 mm, then Measured NT is 75 percentile for this CRL

mm. Fetal nuchal translucency. mm. Nuchal transucency (mm) median. 5 th and 95 th centiles. 99 th centile. 45 50 55 60 65 70 75 80 0 0.5 1 1.5 2 2.5 3 3.5 4 Crown-rump length (mm) Wright D, Kagan KO, Molina FS, Gazzoni A, Nicolaides KH. A mixture model of nuchal translucency thickness in screening for chromosomal defect The prevalence of fetal abnormalities increased with nuchal translucency thickness: 3 mm, 2.4%; 4 mm, 7.1%; 5 mm, 12.3%; 6 mm, 16.7%; 7 mm 35.6% 22. The diagnosis of abnormalities was made by ultrasound examination in mid-pregnancy, or by pathological examination in terminations of pregnancy and intrauterine or neonatal deaths, or by clinical. Hi, My wife is pregnant and she is currently 14 weeks and 6 days.( LMP : 9-June) We had taken NT scan on 10-Sep ( 13 weeks and 2 days) which measured 1.4 mm of Nuchal translucency . Dual marker test. Nuchal translucency 1.3 mm normal at 12+3 weeks? Answer: Yes dear your baby's weight is in range by 30 weeks of pregnancy baby should be around 1.5 kgs. Maintain healthy protein rich diet for healthy growth of your baby Nuchal translucency in fetuses affected by homozygous. a-thalassemia-1 at 12-13 weeks of gestation. Ultrasound Obstet Gynecol 1999; 13: 238-240. Hyett J, Noble P, Sebire NJ, Snijders RJM, Nicolaides KH. Lethal congenital arthrogryposis presents with increased nuchal translucency at 10-14 weeks of gestation

Nuchal Fold thickness 7mm at 20 week scan - December 2018

  1. The requirements for obtaining the FMF certificate of competence in the nuchal translucency (NT) scan are: Attendance of the internet based course on the 11-13 weeks scan. Submission of a logbook of 3 images demonstrating the measurement of NT. Protocol for measurement. The gestational period must be 11 to 13 weeks and six days
  2. High nuchal translucency measurement at dating scan. I'm new on here and was wondering if anyone has had/having a similar experience to us. I had my scan on Wedneday (12 weeks 2 days) and was told that our nuchal measurement was 3.6mm, which was raised. I haven't had any blood tests but based on this measurement have been told that there is a.
  3. An NT measurement of up to 2.0mm is normal at about 11 weeks, and up to about 2.8mm by 13 weeks and 6 days. This is because the NT normally grows in proportion to the growth of the baby. A baby with a normal NT of 1.3mm will be low risk. If the NT is increased, it does not mean there is definitely a problem
  4. e the fetus's likelihood of having Down Syndrome or some other chromosome abnormality. Major heart problems can also be detected using the NT prenatal test. The ultrasound is done as a transvaginal ultrasound and it measures the thickness of the.

Crown Rump Length and Nuchal Translucency Calculato

Figure 2. Increased nuchal translucency thickness (NT) The findings of numerous studies suggest that an effective first trimester screening for trisomy 21 can be obtained by the combination of maternal age and measurement of fetal NT [4-11].At a risk cut-off of 1 in100, the detection rate of trisomy 21 is about 75%, at a false positive rate of about 2% Nuchal thickness ( NT) is the anechoic space located behind the fetal neck that is visible and measurable in almost all fetuses from 10 to 13 weeks + 6 days. It is a transient marker that disappears by the end of the first trimester). Fetal crown-rump length must be between 38 mm and 84 mm My telling her that I had IVF and the most accurate date possible is 12+4 and it isn't dependant on her measurements clearly went in one ear and out of the other. Then it was time to measure the nuchal fold and she managed to sneak in a measurement of 1.1mm before baby had enough and began to violently protest strong association between increased nuchal translucency and abnormal fetal karyotype [1,3-5]. In an early prospective screening study, 6% of fetuses were found to have a nuchal translucency of ≥3 mm at 11 to 14 weeks of gestation with a 10-fold increase in chromosomal abnormalities such as trisomies, Turner syndrome, and triploid What is a normal nuchal translucency measurement at 13 weeks? During the routine first trimester screening at 13 weeks of gestation, NT was measured at 3 mm. The normal range of NT for this age is 1.6-2.4 mm. Nuchal skin fold (NF) measurements and prenatal follow-up ultrasound findings were normal

Nuchal translucency thickness was measured prospectively from 11 to 14 weeks by the same sonographer using varieties of transducers frequencies ranging from 3.0 to 5.0 MHz, the sonographer were credentialed for the measurement of nuchal translucency thickness by the regional organization and following the SDMS standards In one study, 84% of karyotypically proven trisomy 21 fetuses had a nuchal translucency >3 mm at 10-13 weeks of gestation (as did 4.5% of chromosomally normal fetuses). The greater the extent of FNT, the greater the risk of abnormality The positive and negative predictive values for this cut off point of nuchal translucency thickness were 1.5% and 99.9% respectively. Conclusions: Measurement of fetal nuchal translucency thickness—traditionally used to identify fetuses at high risk of aneuploidy—at 10-14 weeks of gestation can identify a large proportion of fetuses with. A nuchal translucency scan must take place at a particular time in your pregnancy. It is done: between 11 weeks and two days and 13 weeks and six days. The best time to get it done is at 12 weeks of pregnancy. or when your baby's crown-rump length (CRL) is between 45mm (1.8in) and 84mm (3.3in)

Nuchal translucency Radiology Reference Article

Background: An important component of the first-trimester scan is nuchal translucency thickness at 11 weeks to 13 weeks 6 days of gestation. A nuchal translucency ≥3.3 mm is a significant early. Hi ladies , Today I had my nuchal translucency @ 12 wks 2 days, and was told my measurements was at 1.5. I this good? The tech also stated they lije to see the number under 3. But I was told by the tech I would have to wait about a wk for the results because I also had blood work and the results are combined Results : The mean maternal age in this study was 24 ± 2 yrs (range 19-32 yrs) The mean NT thickness was 1.5 ± 0.5 mm The mean CRL was 58 ± 9.07 mm The median gestational age was 12.5 weeks The regression equation relating median NT thickness to CRL was described as follows : Expected NT thickness (mm) = 0.437 + 0.01969 * CRL (mm) TABLE 1.

The CRL must be between 45 and 84 mm for the testing to be performed, that is 11 to 13+6 weeks pregnant. The nuchal translucency is a measurement of fluid behind the baby's neck that is present in all babies during the first trimester of pregnancy Objective: To describe the natural history of fetuses with a nuchal translucency (NT) above 3.5 mm when crown-rump length measures between 45 and 84 mm. Methods: We performed a retrospective cohort study of fetuses with first trimester NT above 3.5 mm between January 2013 and March 2017. Results: A total of 75 cases with NT above 3.5 mm in the first trimester were identified. 3 cases were. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. Measurement of nuchal translucency (NT) between 11 and 13 +6 weeks above the 99 th centile (≥3.5 mm) is defined as increased NT. Increased NT thickness is associated with fetal structural defects, chromosomal abnormalities, and genetic disorders [ 2 - 7 ] A progressive increase and subsequent decrease in nuchal translucency thickness occurs with advancing gestation in most fetuses, but the timing of the peak thickening appears to be fetus-specific. In this study, each fetus developed a visible nuchal translucency. If the nuchal translucency measurement is 0 mm before 12 weeks, it may be.