T7: (also known as FTI [free thyroid index])

 

[normal range is 2.6 - 3.6]

T7 essentially reflects the metabolic impact of the thyroid hormone on the body. T7 can be calculated by the following equation: T7 = T3/100 x T4.

It is interesting to note that many patients may in fact look like and complain of symptoms associated with hypothyroidism, yet have normal or nearly normal thyroid indices. When the blood work appears somewhat unremarkable, yet you still are clinically thinking that this patient has hypothyroidism, consider having the patient

do the basal body temperature study.

 

The following form is a common form utilized for the basal temperature test: