endocrine
T4, free
Also known as free thyroxine, FT4
Specification
- Method
- Automated immunoassay Antibody-based, chemiluminescent or equivalent
- Validated matrices
-
- Venous serum Standard draw
- Tube
- RED
- CPT
84439
Published reference ranges
Published values for T4, free vary along 2 axes:
- age
- pregnancy trimester
Because a single unstratified figure would misrepresent them, none is shown here.
Published values vary by sex, age, time of collection, menstrual cycle phase and analytical method. The interval applicable to a patient's result appears on that patient's report.