Free thyroxine (fT4)

Test investigation

Free thyroxine (fT4)

Laboratory offering test

NNUH, QEH, JPUH

Units

pmol/L

Comments precautions

Part of thyroid profile for the investigation of thyroid disorders. Please contact the lab if you suspect assay interference

Sample type

Serum

Turnaround times (TAT) Urgent/Routine/GP or OPD

Daily

Reference intervals

Adult (> 18 yr) range: 9.0 – 19.1 pmol/L Paediatric ranges: 5 days – 14 days 13.5 – 41.3 pmol/L 15 days – 29 days 8.7 – 32.5 pmol/L 30 days – < 1 yr 11.4 – 21.9 pmol/L 1 yr – < 19 yr 11.4 – 17.6 pmol/L (n=952)

If ukas accredited

Y NNUH