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Test & Collection Guide

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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

 

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.

Pathology Handbook

Test & Collection Guide

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