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Free T4

Alias: Free Thyroxine

Discipline: Clinical Chemistry

Test information: To diagnose hypothyroidism (A condition resulting from decreased production of thyroid hormones) or hyperthyroidism (A condition resulting from increased production of thyroid hormones) in adults and to monitor response to treatment.

Specimen Type(s)
  • Blood;
Other Acceptable Specimen Type(s)
N/A
Specimen Container - Adult
  • Gold Top SST BD;
Specimen Container - Paediatric
  • Clear - Plain;
Analytes
  • N/A;
Part of a test profile?
No
Volume (min) of sample to be sent to laboratory
1ml
Patient Preparation, Sample Handling and Transport
N/A
Maximum add on time
5 days
Units and Reference Ranges / Interpretation
RR for Male and Female
less than 15days - 13.5 - 41.3 pmol/L
15days to less than 30 days - 8.7 - 32.5 pmol/L
30days to less than 1yr - 11.4 - 21.9 pmol/L
1yr to less than 19yrs - 10.3 - 17.0 pmol/L
Adult - 9.0 - 19.0 pmol/L
UKAS number
8869
UKAS accredited test?
Yes
Comments
N/A

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Last updated: 10-05-2024