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Microbiology Sources | Microbiology Tests | Anatomic Pathology | Cytopathology

Maternal Serum Prenatal Screen, Second Trimester

Source Blood
Mnemonic MATSC
Specimen Requirements 1 x 3.5 mL gold top SST tube AND 1 x 3.0 mL light green (mint) top PST tube
Specimen Handling Submit completed CLS Maternal Serum Prenatal Screen history form #CH3011.

PSC and RRL: 
Centrifuge all tubes and pour half of one 3.5 mL gold top SST tube into an aliquot tube prior to sending to DSC.
Additional Information

Test includes:
- Estriol, Unconjugated (E3)
- Beta HCG, Quantitative - Blood
- AFP

Testing should be performed between 15 3/7 to 16 3/7 weeks gestation, not earlier.
Timing for ultrasound not crucial as calculation takes date into account. 

Testing Location Immunochemistry
Testing Frequency Weekdays
Alternate Name(s) Alpha-1-Fetoprotein; Biochemical Screen; Downs Syndrome Maternal Triple Screen; Triple Screen, Downs Syndrome
Reference Interval