How It Works

Part 1 of the Sequential Screen | FßSM

Part 1 of the sequential screen may be the First Trimester Screen or Maternal Fetal Screen.

Part 2 of the Sequential Screen | FßSM


An additional  maternal blood sample is analyzed in the second trimester for four biochemical markers: alpha-fetoprotein (AFP), free beta hCG, unconjugated estriol, and inhibin-A

Read more about the importance of biochemical markers in prenatal screening.


Down syndrome

Detection Rate
False Positive

Detection Rate with Nasal Bone
False Positive with Nasal Bone

Trisomy 18/13

Detection Rate
False Positive

Open Spina Bifida

Detection Rate
False Positive


Detection Rate
False Positive

Test Results

Turn around time: Results can be expected 1-3 business days from the time the sample is received at the laboratory.

More Insight into Potential Outcomes with Screening Report Flags

Physicians can have valuable comments added to patient reports that flag the risk of other potential adverse pregnancy outcomes associated with your patients’ extremely high or low analyte levels. With these comments, you can provide your patients with a more comprehensive pregnancy risk assessment.

Learn more about how to opt-in for prenatal report flags.

Learn more about why NTD Eurofins has been the laboratory to trust for over 30 years.

Learn More

Leave the billing worries to us! NTD works hard to ensure that the billing process is simple and easy for your patients.


Interested in sending samples?

We can help you get started!

Contact Us for More Information