Thyroid-Stimulating Hormone (TSH) and Free T4

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Thyroid-Stimulating Hormone (TSH) and Free T4 (FT4) (Quest Diagnostics)

Same day lab order delivery

HSA/FSA reimbursable

Description

A thyroid-stimulating hormone (TSH) blood test is used to check for thyroid gland problems. TSH is produced when the hypothalamus releases a substance called thyrotropin-releasing hormone (TRH). TRH then triggers the pituitary gland to release TSH.

TSH causes the thyroid gland to make two hormones: triiodothyronine (T3) and thyroxine (T4). T3 and T4 help control your body's metabolism.

Includes

Thyroid-Stimulating Hormone (TSH)
Thyroxine Free, Direct Dialysis (FT4)

Patient Instructions

Samples should not be collected during or soon after the administration of Heparin.

Estimated turnaround for results is 7 business days. If confirmation testing is required, the estimated time may be extended.

Thyroid-Stimulating Hormone (TSH) and Free T4 (LabCorp)

Same day lab order delivery

HSA/FSA reimbursable

Description

Synonyms: TSH and Free T4

TSH causes the thyroid gland to make two hormones: triiodothyronine (T3) and thyroxine (T4). T3 and T4 help control your body's metabolism.

Includes

Thyroid-stimulating hormone (TSH)
Thyroxine Free (FT4), Direct

Patient Instructions

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.