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Test Code TT1 First Trimester Testing

Additional Codes

Epic Ordering Code LAB3041104
NBS code LBC01078
Service code 31958

Specimen Requirements

Submit the following:

Container:
Yellow Top

Processing Requirements

Allow specimen to clot for 30 mins and centrifuge within 2 hours

Specimen type: Serum

Volume: 0.5mL

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.

Update

Last updated 16/07/2026

LOINC Code Information

Free Beta Human Chorionic Gonadotropin Hormone (FBHCG)   19180-9
Pregnancy Associated Placenta Protein-A (PAPP) 32046-5        

Panel Information

Panel includes the following tests:

  • Free Beta Human Chorionic Gonadotropin Hormone (FBHCG)
  • Pregnancy Associated Placenta Protein-A (PAPP)

Alias

First Trimester Maternal Screen