Free T4 Index – Serum

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Testing Laboratory

Canterbury Health Laboratories Christchurch Hospital

Department

Refer to Testing Lab link

Delphic Registration Code (Alpha Code)

TFI4

Test Code (Numeric Code)

8246

Synonyms

Free T4 index,
FTI,
Free Thyroxine Index

Specimen Type

  • Plasma
  • Serum

Specimen Requirements

Tube/Container Type:

Preferred
  • SST II (Gold Cap)
Preferred if Waitākere
  • SST II (Gold Cap)
Acceptable
  • Lithium Heparin - Non-gel (Green Cap)
  • Plain (Red Top)
Preferred Sample Volume (ml)

4

Minimum Sample Volume (ml)

1

Last updated: 01/05/2026