Total T4 Test

What is Total T4?

• Hormone: Thyroxine (T4) is one of the main hormones produced by the thyroid gland.
• Function: T4 plays a crucial role in regulating metabolism, growth, and energy levels in the body.
• Measurement: Total T4 measures both the free (unbound) and protein-bound forms of T4 in the blood.

Why is the Total T4 Test Done?

1. Thyroid Function: Helps assess overall thyroid function, especially when combined with other thyroid tests.
2. Diagnosis: Used to diagnose hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid), depending on T4 levels.
3. Monitoring: Monitors treatment effectiveness in thyroid disorders and adjusts thyroid hormone replacement therapy.

When Should You Get a Total T4 Test?

• Thyroid Symptoms: If you have symptoms of thyroid dysfunction, such as unexplained weight changes, fatigue, sensitivity to cold or heat, or changes in heart rate.
• Thyroid Disorders: Individuals with known thyroid conditions or family history of thyroid disease.
• Pregnancy: Routine testing during pregnancy to monitor thyroid function, as it can affect fetal development.