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First Trimester Screen, hCG
Test Code16145
CPT Codes
81508<br /> **Not for California Clients. For New York patient testing, use test code 16968**
Includes
PAPP-A (Pregnancy-associated Plasma Protein-A), hCG, Maternal Risk calculation which includes NT (Nuchal Translucency)
Preferred Specimen
1.5 mL serum
Minimum Volume
0.8 mL
Instructions
Collect between 10.0 weeks to 13 6/7 weeks.
Perform between 10 to 13.9 (13 6/7) weeks gestational age. A special Maternal Serum Screen requisition designed to obtain patient data and the patients informed consent must be utilized when ordering this test, because these results are influenced by certain patient characteristics. All data requested on the requisition form must be complete to permit accurate interpretation of results.
Perform between 10 to 13.9 (13 6/7) weeks gestational age. A special Maternal Serum Screen requisition designed to obtain patient data and the patients informed consent must be utilized when ordering this test, because these results are influenced by certain patient characteristics. All data requested on the requisition form must be complete to permit accurate interpretation of results.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 14 days
Refrigerated: 14 days
Frozen: 28 days
Refrigerated: 14 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis
Methodology
Calculation (CALC) • Chemiluminescence (CL) • Immunoassay (IA)
FDA Status
This test was performed using a kit that has not been cleared or approved by the FDA. The analytical performance characteristics of this test have been determined by Quest Diagnostics. This test should not be used for diagnosis without confirmation by other medically established means.
Setup Schedule
A.M. Sets up 6 days a week.
Limitations
First Trimester Screen results consistent with increased risk of trisomy should be confirmed with CVS or amniotic fluid specimen. Maternal serum screening yields a low percentage of false negatives. A wide range of other chromosomal abnormalities are not identified by maternal serum screening.
Clinical Significance
To screen for Down Syndrome and Trisomy 18 at 10.0-13.9 weeks gestation.
