Only available with Chemical Pathologist approval.
Department
Endocrinology Lab
Delphic Registration Code
T3
Synonyms
T3 Total
Total T3
TT3
Turnaround Time
7 days
Test Code
8865
Specimen Type
Serum
Plasma
Specimen Requirements
Tube/Container Type:
Preferred
Serum (Red Cap)
Preferred if West Coast
SST II (Gold Cap)
Acceptable
SST II (Gold Cap)
Lithium Heparin - Non-gel (Green Cap)
Lithium Heparin - Gel (Light Green Cap)
Preferred Sample Volume (ml)
5.0
No of Samples Required
1
Paediatric Specimen Requirements
Tube/Container Type:
Preferred
Serum (Red Cap)
Acceptable
SST II (Gold Cap)
Lithium Heparin - Non-gel (Green Cap)
Lithium Heparin - Gel (Light Green Cap)
Preferred Sample Volume (ml)
1.0
Additional Specimen Information
Pre-Testing Requirements:
Patients who are undergoing biotin therapy and/or ingesting biotin supplements with levels of >100ng/mL will show a falsely high TT3 result in the Beckman TT3 assay.
Aliquot Instructions
Sample Type
Serum
Plasma
Minimum Volume (ml)
1.0
Transport to Lab
Frozen
If overnight - Frozen
Additional Referral/Aliquot Information
Minimum 1.0 ml serum. Ideally 1.5 ml. This volume allows all total thyroid function tests to be performed. Fridge 4C.
Reference Intervals
1.3 – 2.7 nmol/L (Manufacturers data).
Test Method
Beckman-Coulter Access Analyser - CMIA
Non-Funded Test Cost
$30.7 (Exclusive of GST)
Billing Code
8865
EDTA not acceptable.
Adjunct to primary thryoid function screen.
Automated method with different reference range introduced 22 August 2014
