Testing Laboratory
Auckland Te Toka Tumai | Auckland HospitalDepartment
Chemical Pathology
Delphic Registration Code (Alpha Code)
FT4
Test Code (Numeric Code)
3024
Laboratory Handling
Sample Stability
5 days at 20-25°C, 7 days at 2-8°C, 30 days at -20°C
Synonyms
FT4, T4, Thyroxine free
Turnaround Time
3 hours
Specimen Type
- Plasma
- Serum
Specimen Requirements
Tube/Container Type:
Preferred
- Lithium Heparin PST- Gel (Light Green Cap)
Acceptable
- EDTA (Lavender Cap)
- Lithium Heparin - Non-gel (Green Cap)
- Plain (Red Top)
- SST II (Gold Cap)
Preferred Sample Volume (ml)
5
Minimum Sample Volume (ml)
3.5
No of Samples Required
1
Paediatric Specimen Requirements
Tube/Container Type:
Preferred
- Lithium Heparin PST- Gel (Light Green Cap)
Acceptable
- EDTA (Lavender Cap)
- Lithium Heparin - Non-gel (Green Cap)
- Plain (Red Top)
Preferred Sample Volume (ml)
0.5
Minimum Sample Volume (ml)
0.5
Additional Specimen Information
0.5 mL Paediatric Microtainer PST Blood (Preferred)
0.5 mL Paediatric Microtainer Heparin Blood
0.5 mL Paediatric Microtainer Plain Blood
0.5 mL Paediatric Microtainer EDTA Blood
Last updated: 05/08/2026