Free T4-Ayumetrix Kit (AT HOME TEST):
Note: This is a home collection test kit that will be mailed to you.
Coupon Codes not valid for this testing.
Fasting Required: No
Lab: Ayumetrix
Specimen: Bloodspot
Results: Average processing time 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.