Hormones & thyroid
Free Triiodothyronine (Free T3)
About
Measures the active free fraction of triiodothyronine (free T3). Used to assess thyroid function.
Preparation
Do not eat for 2-3 hours before the test; still water is allowed. Stop steroid and thyroid hormones 48 hours before the test (as agreed with your doctor). Avoid physical and emotional stress 24 hours before the test. Do not smoke for 3 hours before the test.