T3: Common Questions

Also known as: Total T3 and Free T3
Formal name: Triiodothyronine
Related tests: TSH, T4, Thyroid Antibodies

	Common Questions
	1. How does pregnancy affect thyroid hormone levels? 2. What is the T3 uptake test? 1. How does pregnancy affect thyroid hormone levels? Pregnancy can increase total T3 levels although it does not mean that thyroid disease will develop. For more information, see Thyroid Foundation of America: Thyroid Problems During and After Pregnancy - Are You At Risk?. [Back to top ] 2. What is the T3 uptake test? T3 uptake is also known as T3 Resin Uptake (T3RU) or Thyroid Uptake. It estimates how much thyroid hormone-binding proteins are available in the blood through a calculation based on levels of T3 or T4 added to a patient’s blood specimen. It is rarely ordered anymore in favor of free T3 and free T4 levels. [Back to top ] << Prev \| Next >>

This article was last reviewed on January 26, 2008.