Maternal Serum Screen, First Trimester
Ordering Recommendation

First trimester screening test for trisomy 21 (Down syndrome) and trisomy 18. Does not include alpha fetoprotein for open neural tube defects. Requires nuchal translucency measurement performed by an ultrasonographer certified by the Fetal Medicine Foundation (FMF) or Nuchal Translucency Quality Review (NTQR).

Quantitative Chemiluminescent Immunoassay
2-4 days
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
This test requires a nuchal translucency (NT) measurement that has been performed by a certified ultrasonographer. The ultrasonographer MUST be certified to perform NT measurements by one of the following agencies: Fetal Medicine Foundation (FMF) or Nuchal Translucency Quality Review (NTQR). To avoid possible test delays for an ultrasonographer who is new to our database, please contact the genetic counselor at 800-242-2787 extension 2141 prior to sending specimen.

If an NT is unobtainable, order Maternal Serum Screening, Integrated (ARUP test codes 0081062 and 0081064), which can be interpreted without an NT value.

Specimen must be drawn in the first trimester between 11 weeks, 0 days and 13 weeks, 6 days. (Crown-Rump length (CRL) must be between 4.4-8.5 cm). Patient History information is required 
Serum separator tube or plain red. 
Specimen Preparation
Separate serum from cells ASAP or within 2 hours of collection. Transfer 3 mL serum to an ARUP Standard Transport Tube. (Min: 1 mL) 
Storage/Transport Temperature
Unacceptable Conditions
A crown-rump length greater than 8.5 cm. Plasma. Specimens exposed to repeated freeze/thaw cycles. Hemolyzed specimens. 
The First Trimester Maternal Screen also requires the following information: a crown-rump length measurement (cm), ultrasonographer's name and certification number, date of ultrasound, patient's date of birth, current weight, due date, number of fetuses present, patient's race, if the patient has had a previous pregnancy with a chromosome abnormality, physician's name and phone number; and for in vitro fertilization pregnancies, the age of the egg donor. 
After separation from cells: Ambient: 8 hours; Refrigerated: 2 weeks; Frozen: 2 months 
Reference Interval
By report
Interpretive Data

This test does not screen for Open Neural Tube Defect (ONTD). This test is used to screen for fetal risk of Down syndrome (trisomy 21) and trisomy 18.
Component Test Code*Component Chart NameLOINC
0080241Estimated Due Date11778-8
0080917Maternal Weight29463-7
0080920Maternal Screen Interpretation49586-1
0080926Maternal Race21484-1
0080927Number of Fetuses11878-6
0080932Maternal Age At Delivery21612-7
0080935Patient's hCG19080-1
0080937MoM For hCG20465-1
0080938Gestational Age (Exact)18185-9
0081065Nuchal Translucency (NT)12146-7
0081066Crown Rump Length11957-8
0081067Patient's PAPP-A32046-5
0081068MoM for PAPP-A32123-2
0081069Sonographer Certification #49089-6
0081070Sonographer Name49088-8
0081071Ultrasound Date34970-4
0081074MoM for NT49035-9
0081158Family History of Aneuploidy32435-0
2003011EER Maternal Serum, First Trimester
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • Combined Screen
  • First Trimester Screen
  • Ultrascreen