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HelpTest Code TT1 First Trimester Testing
Specimen Requirements
Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0 mL
Minimum Volume: 0.5 mL serum
Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | 25 hours |
| Refrigerate | 8 days |
| Frozen | 12 months |
Specimen Condition
| Gross Haemolysis | Reject |
|---|---|
| Gross Icterus | Reject |
| Gross Lipaemia | Reject |
| Others | Not applicable |
Methodology
Electrochemiluminescent Immunoassay
Days and Times Performed
Monday through Friday, TAT 1-4 days
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Prenatal screening for Down’s Syndrome in first trimester of pregnancy.
Service Code
31958
Update
Last updated 18/07/2025
Panel Information
Panel includes the following tests:
- Free Beta Human Chorionic Gonadotropin Hormone (FBHCG)
- Pregnancy Associated Placenta Protein-A (PAPP)
LOINC Code Information
| Free Beta Human Chorionic Gonadotropin Hormone (FBHCG) | 19180-9 |
|---|---|
| Pregnancy Associated Placenta Protein-A (PAPP) | 32046-5 |
Alias
First Trimester Maternal Screen