T3 Uptake provides an indirect measurement of T4 levels, as well as the amount of available protein (primarily TBG) that can bind to T3 and T4.
In T3 uptake, radioactive T3 (RT3) is added your blood sample in the laboratory; by measuring how much RT3 can attach to thyroid hormone-binding proteins, the amount of T4 that is already bound to the proteins can be indirectly quantified.
The results of T3 uptake are only useful when considered together with other thyroid hormone tests such as thyroxine (T4) and TSH.
Fasting is required prior to taking this test. An ideal time to take this test is in the morning.
Results are typically ready in 7-10 business days or less.
The laboratory services are for informational purposes only. It is not the intention of MYLABFAX LLC to provide specific medical advice but to provide users with information to better understand your health. Please speak to a medical professional about your results for proper diagnosis and treatment.
Both the physician and the testing laboratory are independent contractors with whom MYLABFAX LLC makes arrangements for your blood tests. By Purchasing your lab tests through MYLABFAX you agree MYLABFAX LLC will NOT be held liable for any acts or omissions of the physicians, the testing laboratory, or their agents or employees.
Step 1: Order the lab test.
Step 2: Download and print the lab slip from your login page.
Step 3: Locate your nearest Quest Diagnostics Laboratory from the 'lab locator' tab on your login page.
Step 4: Visit the laboratory with your slip to have your blood drawn.
Step 5: Results take 7-10 business days. An email will be sent requesting you to login to your page to access them.
For a more detailed explanation, please visit our step-by-step guide on ordering tests.