Serum norepinephrine Blood test. T 3 resin uptake Blood test. An estimate of thyroid-binding proteins, not a measure of T 3 levels. Results are affected by pregnancy, oral contraceptives, and other medications. Thyroid binding globulin Blood test.
Levels rise during pregnancy.
Thyroid function tests A group of tests that measure thyroid hormones as part of the standard workup for suspected thyroid problems. Thyroid scan Generates a picture of thyroid function. See below for a full description. Thyroid uptake Measures the ability of the thyroid to take up iodine. See below for a full description.