T3 resin uptake (T3RU): This calculates the percentage of TBG in the blood. What to Expect During the Test Thyroid blood tests involve a basic blood draw, also known as a venipuncture. You will be ...
Unless you are also having other blood tests done that require fasting, you will not have to restrict food, drink, or medication before the test. A standard blood draw is a low-risk procedure that's ...