Thyroid function test, For diagnosis of hypothyroidism and hyperthyroidism. Decreased in hypothyroidism and in the third stage of (painful) subacute thyroiditis; increased with hyperthyroidism, with subacute thyroiditis in its first stage and with thyrotoxicosis due to Hashimoto disease. Used to diagnose T4 toxicosis.
A significant deviation from the normal range may require further evaluation by your physician.
Alternative Name(s): T4, Total; Total T4; T4; Tetraiodothyronine
Thyroxine (T4) Total
***Thyroxine (T4) Total is included in the Thyroid Profile w/ TSH.***
No fasting required.
Estimated turnaround for results is 3 business days. If confirmation testing is required, the estimated time may be extended.
Thyroid function test. Decreased in hypothyroidism and in the third stage of (painful) subacute thyroiditis; increased with hyperthyroidism, with subacute thyroiditis in its first stage and with thyrotoxicosis due to Hashimoto disease. Used to diagnose T4 toxicosis.
A significant deviation from the normal range may require further evaluation by your physician.
Thyroxine (T4) Total
This test is also known as:
T4, Total;
Tetraiodothyronine;
Total T4
****Thyroxine (T4) Total is included in the Thyroid Profile w/ TSH and the Thyroid Profile II (Comprehensive).***
This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H or coenzyme R). It is recommended to stop biotin consumption at least 72 hours prior to the collection of specimen. Estimated turnaround for results is 3 business days. If confirmation testing is required, the estimated time may be extended.
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