Free T4-Ayumetrix Kit

Note: This is a home collection test kit that will be mailed to you.



Fasting Required: No

Specimen: Bloodspot

Lab: Ayumetrix

Results: 5-7 business days
Note: Result turnaround times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

Special Instructions: Sample should be collected within the first 30 minutes of waking in the morning.

Description: Free thyroxine (FT4) comprises a small fraction of total thyroxine. The FT4 is available to the tissues and is, therefore, the metabolically active fraction. Elevations in FT4 cause hyperthyroidism, while decreases cause hypothyroidism.