Test Catalog

Test ID: SEQA    
Sequential Maternal Screening, Part 1, Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

First-trimester prenatal screening for Down syndrome (trisomy 21) and trisomy 18

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

Sequential maternal screening is a 2-step test, with first- and second-trimester components. It requires a nuchal translucency (NT) measurement and blood collection in the first trimester. If the result from part 1 indicates a risk for Down syndrome that is higher than the screen cutoff, the screen is completed and a report is issued. If the results from part 1 are negative, an additional blood collection in the second trimester is required (see SEQB / Sequential Maternal Screening, Part 2, Serum). If the second specimen is not received for sequential screening, the results are uninterpretable and no maternal risk will be provided.


The following are available in Special Instructions:

-Sequential Maternal Serum Screening Testing Process

-Prenatal Aneuploidy Screening and Diagnostic Testing Options Algorithm

Special Instructions Library of PDFs including pertinent information and forms related to the test

Method Name A short description of the method used to perform the test

Immunoenzymatic Assay

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

Sequential Maternal Screen, Part 1

Aliases Lists additional common names for a test, as an aid in searching

Maternal Serum Sequential Screen
Sequential Screening
Serum Stepwise Sequential Screen
Stepwise Maternal Screen
Stepwise Sequential