Please note that this site is unsupported on Internet Explorer, and may not function as intended.

We recommend upgrading to the latest version of Microsoft Edge, Google Chrome or Firefox.

Test & Collection Guide

 New search...

Keyword Search:

Test name:

   

Manual search:

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

NUMBER

ALL

Thyroid Function Tests (TSH and FT4)

Ordering information:

Reverse T3 no longer performed in Australia.

Alternate names:
Free Thyroxine, FT3, FT4, TFT, Thyroid Stimulating Hormone, Tri-iodothyronine, TSH
Laboratory:
Biochemistry
Test Code:
TFT
Specimen types:
Serum
Container types:
Serum tube with gelSerum tube with gel
Collection Instructions:
Transport specimen at Room Temperature to lab
Minimum Adult Volume:
2 mL
Frequency:
Daily
Result Turnaround Time:
5 hours
Reference Interval:

 

Thyroid Function Reference Range
Thyroid Stimulating hormone (TSH) 0.27 - 4.20 mU/L
Free Thyroxine (FT4) 12 - 22.0 pmol/L
Free Tri-iodothyronine (FT3) 3.1 - 6.8 pmol/L

 

Thyroid Function Reference Range
  1st Trimester  2nd Trimester  3rd Trimester 
Thyroid Stimulating hormone (TSH) 0.33 - 4.59 0.35 - 4.10 0.21 - 3.15
Free Thyroxine (FT4) 12.1 - 20.0 9.63 - 17.0  8.39 - 16.0
Free Tri-iodothyronine (FT3) 3.8 - 6.0 3.2 - 5.5 3.1 - 5.0 
Laboratory Use Only
Storage Instructions:

TSH is performed. Free T4 is performed only if indicated by clinical details or the TSH result

Free T3 is performed where appropriate.

Clinical comments are essential - record of therapy with thyroxine or anti-thyroid drugs, suspicion of pituitary disease, drug therapy with amiodarone, lithium, phenytoin, etc., which will permit additional tests as required.