FTI (free thyroxine index) is calculated by measuring Thyroid Uptake (TU) and multiplying by TT4.
FTI = (T4 x TU)/TU median of Reference interval.
Useful when there are changes in thyroxine-binding globulin (TBG).
Free T4 index
If overnight - Frozen
Minimum 1.0 ml serum. Ideally 1.5ml serum. This volume allows all total thyroid function tests to be performed.
75-170 nmol/L (manufacturers data)
Beckman-Coulter Access Analyser - CMIA
$28.96 (Exclusive of GST)
EDTA not acceptable.
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