Thyroid Panel with Ferritin and Vitamin D

Ferritin, Serum
Thyroid Peroxidase (TPO)
Thyroglobulin Antibodies (TAA)
Thyroid-Stimulating Hormone (TSH)
Thyroxine Free (FT4), Immunoassay
Tri-iodothyronine Free (FT3)
Vitamin D, 25-Hydroxy LC/MS/MS: Vitamin D, 25-OH, Total; Vitamin D, 25-OH, D3; Vitamin D, 25-OH, D2

Fasting preferred, but not required. In patients receiving therapy with high biotin doses (ie, > 5 mg/day), no sample should be taken until at least eight hours after the last biotin administration.

Estimated turnaround for results is 5 business days. If confirmation testing is required, the estimated time may be extended.

Ferritin, Serum
Thyroid Antibodies: Thyroid Peroxidase (TPO) Ab; Antithyroglobulin Ab (TAA or TgAb)
Thyroid-Stimulating Hormone (TSH)
Thyroxine Free (FT4), Direct
Tri-iodothyronine Free, Serum (FT3)
Vitamin D, 25-Hydroxy

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. Vitamin D, 25-Hydroxy is not the same as calcitriol or 1,25 dihydroxy. Calcitriol/Vitamin D, 1,25 Dihydroxy must be ordered separately.

Estimated turnaround for results is 3 business days. If confirmation testing is required, the estimated time may be extended.