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Free T3

Alias: Free triiodothyronine

Discipline: Clinical Chemistry

Test information: Tri-iodothyronine (T3) constitutes approximately 5% of the thyroid hormones in serum. T3 is produced by both the thyroid gland and mono-deiodination of Thyroxine.

Specimen Type(s)
  • Blood;
Other Acceptable Specimen Type(s)
Specimen Container - Adult
  • Gold Top SST BD;
Specimen Container - Paediatric
  • Clear - Plain;
  • N/A;
Part of a test profile?
Volume (min) of sample to be sent to laboratory
Patient Preparation, Sample Handling and Transport
Maximum add on time
5 Days (Primary care contact lab)
Units and Reference Ranges / Interpretation
RR for Male and Female
less than 1yr - 3.6 - 7.5 pmol/L
1yr to less than 12yrs - 4.3 - 6.8 pmol/L
RR for Female - 12yrs to less than 15yrs - 3.8 - 6.1 pmol/L
RR for Male - 12yrs to less than 15yrs - 4.4 - 6.7 pmol/L
RR for Female - 15yrs to less than 19yrs - 3.6 - 5.7 pmol/L
RR for Male - 5yrs to less than 19yrs - 3.5 - 5.9 pmol/L
RR for Male and Female - 19yrs and above 2.5 to 6.0 pmol/L
UKAS number
UKAS accredited test?

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Last updated: 03-05-2024