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Methodology: Enzyme-Linked Immunosorbent Assay (ELISA) / Chemiluminescent Immunoassay (CLIA)
Edit Date: 4/6/2009 11:23:55 AM
Components: Human Chorionic Gonadotropin (hCG) / PAPP-A / Risk for Down Syndrome / Interpretations
Performed: Monday-Friday
Released: Within 2-3 days of receipt in lab
CPT Code: 84163 / 84702
Specimen Collection Details
Collection: NOTE: Screen can be performed only on individuals with a CRL between 39.0 mm and 80.0mm (10 weeks 5 days – 13 weeks 6 days gestation). NT values provided by a certified sonographer are required.
One 7.5 mL serum separator tube (SST). Also acceptable: One 5 mL red top tube.
Handling: Allow to clot, centrifuge and separate serum from cells immediately. Refrigerate. Order on an Obstetrics requisition or electronically. The following information is required for test interpretation: patient’s date of birth, current weight, due date, dating method (US, LMP), number of fetuses, patient’s race, if patient requires insulin, if a previous child has neural tube defects or Down Syndrome, and for in vitro fertilization pregnancies, the age of the egg donor.
Stability: 4 days refrigerated at 2-8° C, or 30 days frozen at -20° C. Allow not more than one freeze/thaw cycle.
Standard Volume: 2 mL serum
Minimum Volume: 1 mL serum
Transport: Refrigerated, or frozen on dry ice.
Comments: Incomplete information will delay patient results.
Rejection Criteria: Gross hemolysis or lipemia.

PeaceHealth Laboratories