Only available with Chemical Pathologist approval.
Department
Endocrinology Lab
Delphic Registration Code
T3
Synonyms
T3 Total
Total T3
TT3
Turnaround Time
14 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
