Austin Pathology

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Thyroid Function Tests

Alternate Names
TFT
Ordering Information

NOTE: For non-hospital requests, a TSH is the only test performed when a TFT is requested.

In the event that the TSH is 5.0 mIU/L, a fT4 (and fT3 if TSH low) will be automatically added to the request.

If FT3 and/or FT4 are required up front, they must be specifically requested and be accompanied by clinical notes whcih satisfy one of the MBS requirements:

  • thyroid disease is being monitored
  • investigation of dementia
  • psychiatric illness; amenorrhoea
  • infertility
  • pituitary dysfunction
  • sick eurythoid syndrome 
  • patient is on medication/drugs that interfere with thyroid hormone metabolism or function.

 

As of 24/2/2020, TFT performed on Beckman-Coulter DxI. (Previous method: Roche e602). Please note reference intervals have been adjusted.

Cerner Test Name
TSH, FT4, FT3
Laboratory
Biochemistry
Specimen
Blood
Container
Serum tube (gold top)
Additional Collection Instructions
Can be combined with other Chemistry tests requiring same tube type
Minimum Adult Volume
5mL
Minimum Paediatric Volume
1mL
Notes



 

Frequency
Daily
Reference Interval

TSH

0 - 12 years ALL 0.79 - 5.9 mU/L
TSH 12 - less than 19 years ALL

 

0.68 - 3.4 mU/L
TSH 19 years and over ALL

0.38 - 5.3 mU/L

 

FT4 0 to less than 20 days ALL 17.4 - 57.7 pmol/L
FT4 20 days to less than 3 years ALL 9.5 - 17.8 pmol/L
FT4 3 to less than 19 years ALL 7.9 - 13.6 pmol/L
FT4 19 years and over ALL 8.0 - 16.5 pmol/L

 

FT3 0 to less than 1 year ALL 4.3 - 6.9 pmol/L
FT3 1 to less than 15 years  ALL 4.0 - 6.2 pmol/L
FT3 15 to less than 19 years FEMALE 3.5 - 5.3 pmol/L
FT3 15 to less than 19 years MALE 3.8 - 5.7 pmol/L
FT3 more than 19 years ALL 3.8 - 6.0 pmol/L

 

Thyroid Function Tests in Pregnancy:

Beckman-Coulter trimester-specific reference intervals from McNeil AR. Clin Biochem Rev 2015.

For gestational weeks less than 6, use non-pregnant reference intervals.

Note: There are no Beckman-Coulter gestation specific reference intervals for fT3.

 

Trimester 1

(6 to less than 14W)

Trimester 2

(14 to less than 28W)

Trimester 3

(28 to 42W)

TSH mU/L 0.12 - 3.12 0.29 - 3.51 0.25 - 3.93
FT4 pmol/L 7.6 - 14.7 6.0 - 12.5 5.3 - 11.6

Reviewed 06/05/2020