Free T4, Plasma

Department

Core Biochemistry

Delphic Registration Code

FT4

Synonyms

T4 (Free)
Thyroxine (Free T4)

Turnaround Time

3 hours

Test Code

3284

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

Paediatric Specimen Requirements

Tube/Container Type:

Preferred

• Lithium Heparin - Non-gel (Green Cap)

Preferred Sample Volume (ml)

1.0

Additional Specimen Information

Paediatric Specimen - 1000 uL lithium heparin blood, 2x microtainers full

Aliquot Instructions

Sample Type

• Serum
• Plasma

Minimum Volume (ml)

0.4

Transport to Lab

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

Reference Intervals

Adults

8 – 20 pmol/L

 

Paediatrics

 

Age	R.I (pmol/L)
0 – 19 days	13 – 58
20 days – 3 years	9 – 18
> 3 years	8 – 20

 

Change in reference range effective as of 14/12/2021

Test Method

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

Non-Funded Test Cost

$12.65 (Exclusive of GST)

Billing Code

9856

Contact Information

Enquiry Form