Thyroid Hormone Index

'99 Thyroid Profile (Compliance)

7 days

Multiple

Accredited Laboratory Partner

Weekly

The thyroid hormone index, also known as a free thyroxine index (FTI) estimates active, unbound T4 hormone levels in the blood by adjusting total T4 measurements for abnormal levels of carrier proteins.
This profile contains the free thyroxine index, T3 uptake (THBR), and Thyroxine (T4, total).

Clients that wish to order this panel with TSH included should use Order Code 000655.

Serum or Plasma

2 mL

Serum (SST; Gold Top or Plain; Red Top), Plasma (Li-hep; Green Top)

This test may exhibit interference when the sample is collected from a person who is consuming a supplement with a high dose of biotin (vitamin B7, vitamin H, or coenzyme R).Patients should stop biotin consumption at least 72 hours prior to the collection

This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.