Free T4
Measures the active form of thyroxine to help evaluate thyroid function.
Order a Free T4 Test
Lab testing is available through our partner network. Order online and visit a local collection site. No doctor's order or insurance required.
- Sample type
- Blood
- Typical turnaround
- 1-2 business days
- Preparation
- No special preparation required.
Conditions this test helps investigate
The free t4 is among the tests healthcare providers may use to evaluate the following conditions.
Graves Disease
An autoimmune condition causing hyperthyroidism, often with eye changes (bulging eyes) and goiter....
Hashimoto Thyroiditis
An autoimmune disease that attacks the thyroid gland and is the most common cause of hypothyroidism....
Hyperthyroidism
A condition in which the thyroid gland produces too much thyroid hormone, speeding up metabolism and causing w...
Hypothyroidism
A condition in which the thyroid gland does not produce enough thyroid hormone, slowing metabolism and affecti...
Thyroid Nodules
Lumps that form in the thyroid gland. Most are benign, but some require evaluation to rule out cancer....
choanal atresia-athelia-hypothyroidism-delayed puberty-short stature syndrome
Choanal atresia-athelia-hypothyroidism-delayed puberty-short stature syndrome is an autosomal dominant disorde...
Frequently Asked Questions
What does the free t4 measure?
Measures the active form of thyroxine to help evaluate thyroid function.
What sample type does the free t4 require?
The free t4 typically uses a Blood sample. Your healthcare provider or collection site will confirm the exact procedure.
How long does the free t4 take?
Results for the free t4 are typically available within 1-2 business days depending on the laboratory.
Does this website interpret my test results?
No. SymptomDatabase.com does not interpret laboratory results. Your healthcare provider is responsible for interpreting any test result in the context of your health.