fT4 (Free Thyroxine)

LABOKLIN Service ID: 126


Material

Serum (or possibly heparin plasma) 0.5 ml resp. 0.4 ml in small mammals

Method

Chemiluminescence assay (CLIA)

Duration

Reporting of results on the day the sample is received (Mon–Sat)

Remark

  • Just like T4, fT4 is affected by underlying diseases.
  • Further diagnostic tests are recommended if fT4 concentrations are low: determination of TSH concentration, rT3 measurements, TRH Stimulation Test (see Endocrinology/unction Tests)