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.
Thyroid Panel with Ferritin and Vitamin D - (LABCORP)
Significant deviations from the normal range may require further evaluation by your physician.
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.
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