Thyroid Function Test (TFT)

Department

Core Biochemistry

Delphic Registration Code

TFT

Constituent Tests

• TSH, Plasma
• Free T4, Plasma

Turnaround Time

3 hours

Specimen Type

• Serum
• Plasma

Specimen Requirements

Tube/Container Type:

Preferred

• Lithium Heparin - Non-gel (Green Cap)

Preferred if West Coast

• Lithium Heparin - Gel (Light Green Cap)

Acceptable

• Serum (Red Cap)
• SST II (Gold Cap)
• Lithium Heparin - Gel (Light Green Cap)

Preferred Sample Volume (ml)

4.5

No of Samples Required

1

Paediatric Specimen Requirements

Tube/Container Type:

Preferred

• Lithium Heparin - Non-gel (Green Cap)

Acceptable

• Serum (Red Cap)
• SST II (Gold Cap)
• Lithium Heparin - Gel (Light Green Cap)

Preferred Sample Volume (ml)

1.0

Minimum Sample Volume (ml)

1.0

Additional Specimen Information

2 x 0.5ml Paediatric Lithium Heparin Tubes

Aliquot Instructions

Sample Type

• Serum
• Plasma

Minimum Volume (ml)

1.0

Transport to Lab

Chilled (2 - 8 degrees Celsius)
If overnight - Chilled (2 - 8 degrees Celsius)

Additional Referral/Aliquot Information

Separate from red cells ASAP. Freeze (-20 deg C) if > 48 hours

Reference Intervals

See TSH  and FT4 for specific test reference intervals

Test Method

Paramagnetic particle, chemiluminescent immunoassay performed on Beckman Coulter DxI 800 using Beckman Coulter Access reagents

Contact Canterbury Health Laboratories on +64 3 364 0484 or email LabInfo@cdhb.health.nz

Contact Information

Enquiry Form