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Pathology and Laboratory Medicine
Test Catalogue

​Free Thyroxine (FT4)

Chemistry

​Specimen Requirements​

Type​
  • ​Plasma
​Container
​Required Volume
  • ​Optimal Volume: 4.5 mL Full collection tube
  • Minimum Volume: 1.0 mL
    (Submitting the minimum volume makes it impossible to repeat the test or perform confirmatory/reflex testing. In some situations, a minimum volume may require a second collection.)
  • Pediatric Volume
​Stability/Storage
  • 4 hours on cells
  • 7 days at 2 – 8 °C
Grounds for Rejection​

Testing Information​ ​

Availability​
  • ​24 hours a day
Testing Site​
  • ​SPH, RUH
Results Reporting​
  • In Hospital reported within 2 hours
  • Community urgent and inter-hospital reported within 4 hours
  • Community routine reported within 24 hours
​Methodology
  • ​Electrochemiluminescence Immunoassay
​Specimen Retention
  • ​3 days
Alternate Test Names​
  • Free T4
  • fT4
SHR LIS Test Code​
  • ​FRT4 (For Laboratory Use Only)

 

​If you c​ho​ose to print this information, it is valid only on date of print.

Laboratory Controlled Document LSM-119 v2

Last Modified: Tuesday, February 2, 2016 |
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