Specimen: Blood

Results: 1-3 business days

Description: Thyroid function which is particularly useful in the diagnosis of T3 thyrotoxicosis, in which T3 is increased and T4 is within normal limits. T3 toxicosis is occasionally found in Graves' disease. It occurs with a single toxic nodule, multinodular thyrotoxicosis, and following treatment with T3 (Cytomel®).2 It is increased in and occasionally helpful for confirmation of diagnosis of conventional hyperthyroidism, in which commonly both T3 and T4 levels are increased. T3 is needed in patients with clinical evidence for hyperthyroidism, in whom the usual thyroid profile is normal or borderline. T3 is the active form of thyroxine (T4), and plays a key role in growth, development, regulating heart rate, metabolism and the body's temperature.

*Please note: The result turn around time is an estimate only and not guaranteed. The reference lab may need additional time due to conditions with the weather, confirmation or repeat testing, or equipment maintenance and other reasons out of our control.