fT4 (Free Thyroxine)
LABOKLIN Service ID: 126
- Single value determination: fT4 and fT3 both are strongly affected by the current metabolic state
- Just like T4, fT4 is affected by underlying diseases.
- Fasting 10 hours prior to sampling is recommended.
- In cases of doubt: perform TRH stimulation test or – in dogs and cats - measure TSH concentration.
Serum 0.5 ml resp. 0.4 ml (small mammals)