T4-V, or thyroxine, is a thyroid hormone and its level indicates the activity of the thyroid gland.

blood test
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Urea is a waste product that the body cannot utilize. Urea measurement is used in the monitoring of chronic kidney failure.
A more accurate B12-TC2 test (active B12). Vitamin B12 is needed especially for the functioning of the nervous system.
Vitamin D is considered to be one of the important health factors that we can personally influence. Vitamin D is a fat-soluble vitamin necessary for vital human functions and should be ingested in sufficient quantities.