Screening test for open neural tube defects, Down syndrome, and trisomy 18.
Serum integrated screening requires two specimens: one collected in the first trimester and one in the second trimester. This test number is for the second trimester portion of the test. This is a screening test.
Collect between 15.0 and 21.9 weeks of gestation. Patient must have submitted a previous specimen in the first trimester for the Serum Integrated 1  test. Gestational age will be based on information provided with the first trimester specimen.
Spin; pour-off is not advised
Ambient (preferred) - 7 days
Refrigerated - 14 days
Frozen - 14 days
A positive result means that diagnostic testing may be offered to the pregnant woman to determine if a neural tube defect or chromosome abnormality is present.