Published online by Cambridge University Press: 11 October 2022
The prevalence of multiple pregnancies is increasing over the last few decades. This is due in part due to use of assisted reproductive techniques which are associated with a higher prevalence of multiple gestation compared to spontaneous conceptions. There is considerable evidence to suggest that combined screening for fetal aneuploidies is equally effective for twin pregnancies as it is in singletons. This along with a relatively higher rate of fetal defects requires accurate prenatal diagnosis. There is evidence from large cohort studies, systematic reviews and meta-analysis that the risk of procedure-related loss in singleton pregnancies is not significantly higher than the background rate of miscarriages. The number of studies examining the procedure-related loss in twin pregnancies following invasive procedures is fewer compared to singleton pregnancies. Although the background rate of pregnancy loss is higher in multiple pregnancies compared to singletons, there is evidence from recent systematic reviews and meta-analysis that the procedure-related loss following invasive procedures is not significantly higher compared to the background rate of loss in twin pregnancies. Invasive prenatal procedures in dichorionic and monochorionic multiple pregnancies have unique challenges including technical skill, rates of complications and sampling errors and therefore such procedures should be carried out by experienced operators in Fetal Medicine centres.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.