Normal is not the same as optimal, whether it relates to longevity of life, a body temperature or a lab test result. Thyroid levels are a critical component of determining the cause of low metabolic energy.
We can do this on a relative value scale as seen below: We can then interpret lab values in accordance to how high or low they are and by plugging in the definitions noted above, we learn what is going on.
(return to top) Introduction to Interpreting Thyroid Tests Rather than looking at the values as low-normal-high, we can make more sense of the data if we look at each value as it relates to the optimal value.
The Thyroid Scale helps us compare thyroid lab values to each other and thus see their implications more clearly. It can be a line diagram or a table of lab values to visually depict how TSH, T4, and T3 relate to each other.
Example 2: George had a thyroidectomy to remove a cancerous tumor. He was healthy otherwise. His thyroid hormone replacement of 75mcg Synthroid is not enough to meet his needs. He is hypothyroid.
T4: Has four iodine atoms and it is a pro-hormone, i.e., it lives to become either T3 or RT3. T3: When the body needs energy, it removes an iodine atom from the T4 and turns it into T3 which in turn signals living cells to make energy (ATP).
Which causes us to have to adapt the adrenals need to work. Excessive stress can exhaust them. Thyroid energy in excess of what the adrenals can handle is a stressor to the adrenals.
Thyroid hormones: The thyroid gland makes a hormone called T4 (thyroxine). T4 will become T3 (triiodothyronine) which causes energy (in the form of ATP) to be made in each living cell, or Reverse T3 (RT3) which interferes with the energy production in the cell.
Just as a car needs an accelerator and brakes for proper function, the same is true for the body. The body needs T3 (the accelerator) and RT3 (the brake) to manage its energy needs.
T4 is decreased in hypothyroidism and in euthyroid states characterized by decreased TBG. A separate test for "free T4" is available, but it is not usually necessary for the diagnosis of functional thyroid disorders Normal Adult Range: 4 - 11 mcg/dL back to top Thyroxine-Binding Globulation (T3-UPTAKE ) - Increased levels are found in hyperthyroidism.
Protein acts as a sponge or reservoir to which hormones bind and then can be freed. Hormone in free form is then available to interact with a cells receptor site to produce its hormonal effect.
A change in the level of TSH in the blood may signify a malfunctioning of the thyroid gland. THYROXINE (T4) - Increased levels are found in hyperthyroidism, acute thyroiditis, and hepatitis.
Optimal Value: These are the values I have found, in my practice, to correspond to the healthiest segment of the population and which I find not associate with symptoms of thyroid excess or deficiency.
Test Abbreviation Typical Ranges Serum thyroxine T4 ug/dl. Free thyroxine fraction FT4F Free Thyroxine FT4 ng/dl. Thyroid hormone binding ratio THBR Free Thyroxine index FT4I 4-11. Serum Triiodothyronine T3 80-180 ng/dl Free Triiodothyronine l FT pg/d.
(return to top) Introduction to Thyroid Hormones In order to understand what thyroid lab values mean, we first need to understand what each test means individually and then combine them in a way that makes sense.
Example 3: Betty had mononucleosis (EBV) 10 years ago after which she developed anxiety, insomnia, coldness and PMS due to adrenal fatigue. She recently had marital stress. Thyroid lab values show are: TSH 0.9 (below optimal FT4 0.9 (below optimal FT3 260 (below optimal and lower than T4 on the relative scale) What does this.