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 (omnivores and carnivores only).
- In cases of doubt: perform TRH stimulation test or – in dogs and cats - measure TSH concentration.
| Material | Serum 0.5 ml resp. 0.4 ml (small mammals) |
| Method | CLIA |
| Duration | 1 day |