Ryan Longman, MD

Many neurocognitive disorders only present a phenotype after birth. Sukenik-Halevy et al sought to examine the ability to detect prenatal phenotypes in patients with a postnatally diagnosed neurocognitive syndrome and confirmed genetic diagnosis on ES. The team was not able to identify any specific prenatal phenotype associated with their cases of postnatally diagnosed neurocognitive syndromes. The interesting finding of this study is that, of the 122 patients studied, 35.3% (43) had no abnormal sonographic findings that could have been detected prenatally to suggest the need for ES testing. ES is typically used in a prenatal setting for fetuses with anomalies that have a normal KT and CMA. The results of this study raise the question of offering ES to all patients considering diagnostic genetic testing regardless of the indication, as it may be the only way to diagnose some cases of neurocognitive disorders prenatally.

Cell-free fetal DNA (cff DNA) testing for trisomy 21, 18, and 13 has classically be used for high-risk pregnant patients seeking aneuploidy screening. Dar et al sought to examine this type of testing in a low-risk population. They studied, prospectively, the performance of cff DNA testing for trisomy 21, 18, and 13 in both low and high-risk pregnant women with confirmation of results on diagnostic genetic testing. Negative predictive values (NPV) for both the low and high-risk groups were greater than 99.9%. Positive predictive value (PPV) was lower for the low-risk group in comparison to the high-risk group, with it important to note that PPV drops from 96.4% in the high-risk group to 81.8% in the low-risk group for trisomy 21. This means that low-risk patients with a positive result on cff DNA testing are at a higher risk for a false positive than patients at high-risk for an aneuploid fetus. This study shows the mounting evidence that cff DNA can be used in a low-risk population given the high NPV. Providers do still need to note the lower PPV with low-risk population patients and always offer diagnostic genetic testing with any abnormal cff DNA test result.

Many neurocognitive disorders only present a phenotype after birth. Sukenik-Halevy et al sought to examine the ability to detect prenatal phenotypes in patients with a postnatally diagnosed neurocognitive syndrome and confirmed genetic diagnosis on ES. The team was not able to identify any specific prenatal phenotype associated with their cases of postnatally diagnosed neurocognitive syndromes. The interesting finding of this study is that, of the 122 patients studied, 35.3% (43) had no abnormal sonographic findings that could have been detected prenatally to suggest the need for ES testing. ES is typically used in a prenatal setting for fetuses with anomalies that have a normal KT and CMA. The results of this study raise the question of offering ES to all patients considering diagnostic genetic testing regardless of the indication, as it may be the only way to diagnose some cases of neurocognitive disorders prenatally.

Cell-free fetal DNA (cff DNA) testing for trisomy 21, 18, and 13 has classically be used for high-risk pregnant patients seeking aneuploidy screening. Dar et al sought to examine this type of testing in a low-risk population. They studied, prospectively, the performance of cff DNA testing for trisomy 21, 18, and 13 in both low and high-risk pregnant women with confirmation of results on diagnostic genetic testing. Negative predictive values (NPV) for both the low and high-risk groups were greater than 99.9%. Positive predictive value (PPV) was lower for the low-risk group in comparison to the high-risk group, with it important to note that PPV drops from 96.4% in the high-risk group to 81.8% in the low-risk group for trisomy 21. This means that low-risk patients with a positive result on cff DNA testing are at a higher risk for a false positive than patients at high-risk for an aneuploid fetus. This study shows the mounting evidence that cff DNA can be used in a low-risk population given the high NPV. Providers do still need to note the lower PPV with low-risk population patients and always offer diagnostic genetic testing with any abnormal cff DNA test result.

Many neurocognitive disorders only present a phenotype after birth. Sukenik-Halevy et al sought to examine the ability to detect prenatal phenotypes in patients with a postnatally diagnosed neurocognitive syndrome and confirmed genetic diagnosis on ES. The team was not able to identify any specific prenatal phenotype associated with their cases of postnatally diagnosed neurocognitive syndromes. The interesting finding of this study is that, of the 122 patients studied, 35.3% (43) had no abnormal sonographic findings that could have been detected prenatally to suggest the need for ES testing. ES is typically used in a prenatal setting for fetuses with anomalies that have a normal KT and CMA. The results of this study raise the question of offering ES to all patients considering diagnostic genetic testing regardless of the indication, as it may be the only way to diagnose some cases of neurocognitive disorders prenatally.

Cell-free fetal DNA (cff DNA) testing for trisomy 21, 18, and 13 has classically be used for high-risk pregnant patients seeking aneuploidy screening. Dar et al sought to examine this type of testing in a low-risk population. They studied, prospectively, the performance of cff DNA testing for trisomy 21, 18, and 13 in both low and high-risk pregnant women with confirmation of results on diagnostic genetic testing. Negative predictive values (NPV) for both the low and high-risk groups were greater than 99.9%. Positive predictive value (PPV) was lower for the low-risk group in comparison to the high-risk group, with it important to note that PPV drops from 96.4% in the high-risk group to 81.8% in the low-risk group for trisomy 21. This means that low-risk patients with a positive result on cff DNA testing are at a higher risk for a false positive than patients at high-risk for an aneuploid fetus. This study shows the mounting evidence that cff DNA can be used in a low-risk population given the high NPV. Providers do still need to note the lower PPV with low-risk population patients and always offer diagnostic genetic testing with any abnormal cff DNA test result.

Prenatal ultrasound detects structural fetal abnormalities in about 3% of pregnancies. When structural fetal abnormalities are found on prenatal ultrasound, diagnostic genetic testing with either CVS or amniocentesis are recommended. Classically, this has meant fetal karyotype and chromosomal microarray testing (CMA). Recently, a new type of genetic testing has become available on fetal samples, whole-exome sequencing (WES). Smogavec et al. assesses this new technology and its ability to detect fetal genetic abnormalities. They retrospectively studied 90 fetuses with abnormalities detected on prenatal ultrasound that had normal CMA results and negative fluorescence in situ hybridization analysis testing for aneuploidy. They found WES testing added a 34.4% increased rate of detection of fetal genetic abnormalities. WES is a powerful tool for genetic diagnosis in fetuses with structural anomalies and should be considered anytime a karyotype or CMA is normal in a fetus with structural anomalies.

Lastly, prenatal genetic diagnosis at an early gestational age is critical for medical management of fetuses with anomalies. In a cohort study, Chen et al. assess the simultaneous combined use of CNV-seq and WES on testing turnaround time. They found by running the testing simultaneously, rather than sequentially, this would decrease testing time from over a month to less than 2 weeks. This strategy of testing could potentially decrease the time from detection of a fetal anomaly on ultrasound to a genetic diagnosis allowing for earlier counseling and medical guidance.

Prenatal ultrasound detects structural fetal abnormalities in about 3% of pregnancies. When structural fetal abnormalities are found on prenatal ultrasound, diagnostic genetic testing with either CVS or amniocentesis are recommended. Classically, this has meant fetal karyotype and chromosomal microarray testing (CMA). Recently, a new type of genetic testing has become available on fetal samples, whole-exome sequencing (WES). Smogavec et al. assesses this new technology and its ability to detect fetal genetic abnormalities. They retrospectively studied 90 fetuses with abnormalities detected on prenatal ultrasound that had normal CMA results and negative fluorescence in situ hybridization analysis testing for aneuploidy. They found WES testing added a 34.4% increased rate of detection of fetal genetic abnormalities. WES is a powerful tool for genetic diagnosis in fetuses with structural anomalies and should be considered anytime a karyotype or CMA is normal in a fetus with structural anomalies.

Lastly, prenatal genetic diagnosis at an early gestational age is critical for medical management of fetuses with anomalies. In a cohort study, Chen et al. assess the simultaneous combined use of CNV-seq and WES on testing turnaround time. They found by running the testing simultaneously, rather than sequentially, this would decrease testing time from over a month to less than 2 weeks. This strategy of testing could potentially decrease the time from detection of a fetal anomaly on ultrasound to a genetic diagnosis allowing for earlier counseling and medical guidance.

Prenatal ultrasound detects structural fetal abnormalities in about 3% of pregnancies. When structural fetal abnormalities are found on prenatal ultrasound, diagnostic genetic testing with either CVS or amniocentesis are recommended. Classically, this has meant fetal karyotype and chromosomal microarray testing (CMA). Recently, a new type of genetic testing has become available on fetal samples, whole-exome sequencing (WES). Smogavec et al. assesses this new technology and its ability to detect fetal genetic abnormalities. They retrospectively studied 90 fetuses with abnormalities detected on prenatal ultrasound that had normal CMA results and negative fluorescence in situ hybridization analysis testing for aneuploidy. They found WES testing added a 34.4% increased rate of detection of fetal genetic abnormalities. WES is a powerful tool for genetic diagnosis in fetuses with structural anomalies and should be considered anytime a karyotype or CMA is normal in a fetus with structural anomalies.

Lastly, prenatal genetic diagnosis at an early gestational age is critical for medical management of fetuses with anomalies. In a cohort study, Chen et al. assess the simultaneous combined use of CNV-seq and WES on testing turnaround time. They found by running the testing simultaneously, rather than sequentially, this would decrease testing time from over a month to less than 2 weeks. This strategy of testing could potentially decrease the time from detection of a fetal anomaly on ultrasound to a genetic diagnosis allowing for earlier counseling and medical guidance.