There is a considerable confusion regarding timing and logistics of first trimester screening and Nuchal Translucency ultrasound. It is now well established that Biochemical screening (PAPP-A) is best performed at 9-10 weeks and NTS ultrasound at 12-13 weeks gestation (Ref 1).

Firstly, getting the dates correct in the first trimester, especially in women with irregular periods is a challenge. Secondly, logistics of getting NTS Bloods and NTS Ultrasound at different dates is quite difficult in general practice.

At UMI, we have adopted a program that suggests a routine ultrasound at estimated 8-10 weeks for establishing correct dates (CRL measurement is most accurate during this period). This will also give us an opportunity to arrange First Trimester Bloods and book NTS ultrasound at the best possible date.

Referrers are now able to refer for multiple episodes within a pregnancy on a single examination form, depending upon the time of initial presentation of the patient.

First-trimester combined screening for trisomy 21

UMI Pregnancy Request Aug12_Newest