Non-Invasive Analysis of Fetal DNA for Prenatal Screening

  • Test For:

    More than 152 types of chromosomal aneuploidies

  • Sample type:

    10mL blood

  • Turnaround time:

    About 5 working days


General Questions

  • Q What are the differences between our standard panel and advanced panel?

    Standard Panel screens for 14 validated conditions.

    Advanced Panel screens for chromosomal aneuploidies of all 23 pairs of chromosomes, including trisomies and the 126 microdeletions or microduplications with a minimum size of 3 Mb.

    The test results and reports from both tests are signed by our medical technologists and will be reviewed by the professor from the Chinese University of Hong Kong.

    * Since the advanced findings are rare and complex, insufficient data for validation may lower the accuracy. Microdeletions may occur in less than 3Mb in size, SafeT21ExpressTM only searches for microdeletions with a minimum size of 3Mb.

  • Q Who are eligible to do SafeT21 Express?

    Pregnant women with pregnancy of appropriate gestational age as below:


    Twins/ Fetal reduction


    Gestational age

    >10 weeks

    >12 weeks

    >14 weeks

    We highly recommend you to do our from 10 weeks gestational age and up to 24 weeks.

  • Q Is there any gestational age limit for SafeT21 Express?

    No. However, it should be done as early as possible in case of follow-up action or treatment plan to safeguard your baby.

  • Q If I had a Down syndrome baby on my previous pregnancy, does it affect my SafeT21Express result of my current pregnancy?

    No. Fetal DNA will disappear in maternal circulation 2 hours after birth and hence, the result will not be affected by previous pregnancy.

  • Q How long does it take to get my result?

    About 5 working days. If the report is delayed, please seek help from your medical service provider.