Approximately 20% of thyroxine (T4) is converted to triiodothyronine (T3) in the intestines, but only in the presence of friendly flora such as Lactobacillus acidophilus and Bifidobacteria. Triiodothyronine (T3) affects almost every physiological process in the body, including growth and development, metabolism, body temperature, heart rate and may increase serotonin levels in the brain. Many factors may disrupt the balance of thyroid hormone production, including medications, allergies (wheat & gluten), anemia, poor gastrointestinal function, insulin resistance, bone metabolism, hormone imbalances, nutrient deficiencies such as selenium, decreased levels of Vitamin A & D and metabolic disruptors such as PCBs to name a few.
Test Preparation For Optimal Results:
If possible, have the lab collected early in the morning or shortly after waking. For comparison purposes, have subsequent labs collected close to the same time.
Disclaimer: Your health care provider should evaluate a deviation from normal ranges.