Free Triiodothyronine

Also known as: Free T3, FT3

Specimen requirements

Adult sample type: Serum (gold/yellow top SST)

Paediatric sample type: Plasma (orange top paediatric tube)

Collection requirements: No special requirements

Cost

Price on application

Turnaround time

Please see Turnaround times

Analytical method

Immunoassay - Indirect / Competitive

Analysis undertaken at these site(s)

• John Radcliffe Hospital
• Horton General Hospital

Reference intervals

Female

<1 year: 3.6 - 7.5 pmol/L
1 - 5 years: 4.4 - 6.9 pmol/L
6 - 10 years: 4.4 - 6.7 pmol/L
11 - 14 years: 4.0 - 6.5 pmol/L
15 - 19 years: 3.6 - 5.9 pmol/L
> 19 years: 3.0 - 5.4 pmol/L

Male

<1 year: 3.6 - 7.5 pmol/L
1 - 5 years: 4.4 - 6.9 pmol/L
6 - 10 years: 4.4 - 6.7 pmol/L
11 - 14 years: 4.0 - 6.5 pmol/L
15 - 19 years: 3.6 - 5.9 pmol/L
> 19 years: 3.0 - 5.4 pmol/L