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Free T3

About This Test

Department: Biochemistry


  • Gel/clotted (yellow/red top)

Add-on requests are accepted up to 48 hours post sampling


Turnaround Time:

Within 24 hours


Investigation of hyperthyroidism.

Please indicate if patient is currently being treated for thyroid dysfunction (e.g. thyroxine/carbimazole/thyroidectomy) in order to aid interpretation.

If TSH and fT4 analysis indicates a hyperthyroid picture, free T3 analysis may be added by the Duty Biochemist.

Samples will not be analysed if previous analysis performed within 6 weeks. If there is a specific clinical reason for analysis within this timeframe, please state this on the request card.

Reference ranges:

Age range Reference range (pmol/L)
All ages/sexes 3.5 - 6.5

Results outside the reference range do not necessarily indicate disease. Similarly, results within the reference range do not preclude abnormality. Please contact the Duty Biochemist for discussion of individual patient results.

Other Comments:

For more information, please see the following: Free T3 - Lab Tests Online

See also: TSHfree T4