COMPENDIUM ON FUNCTIONAL MEDICINE - Flipbook - Page 155
Normal TSH Range
0.4-5 ulU/mL
Optimal TSH Range
1.5-3.2 ulU/mL
Total T4 (thyroxine) and total T3 (triiodothyronine) are
measurements of both bound and free forms of these thyroid
hormones in the blood. They help assess thyroid function, with total
T4 being the primary hormone produced by the thyroid gland,
while T3 is derived from the conversion of T4 and is more active in
the body. Estrogen dominance can lead to high T4 levels and be
misinterpreted as hyperthyroidism. Low T4 levels may suggest
hypothyroid problems or adrenal fatigue.
Normal Range
4.5-12 ug/dL
Optimal Range
7.5-8.1ug/dL
Free T4 (thyroxine) and Free T3 (triiodothyronine) are the unbound
forms of these thyroid hormones that can enter body tissues and
exert biological effects. They are important indicators of thyroid
function, with Free T4 being the primary hormone produced by the
thyroid gland and Free T3 being the more active form derived
from T4.
Lower levels of free T4 can lead to symptoms of hypothyroidism.
High levels of free T4 can lead to symptoms of hyperthyroidism
Normal Range Free T4
0.82-1.77 ng/dL
Optimal Range Free T4
1.0-1.5 ng/dL
High free T3 can lead to symptoms of hyperthyroidism
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