Showed GP my private Thyroid results. TSH and Free T4 normal but I'm concerned T3 is 2.4 (3.1 - 6.8) I know we need T4 to make T3 but I have restless legs (they think) and Raynauds and shocks to body/burning sensation hands/feet and muscle spasms. Basal temp 35.6 av. and pulse less than 60, even 52 p.minute.
According to the International Hormone Society (lots of info) - intlhormonesociety.org. Serum T3 should be in the upper tertile (33%) reference range to function and feel well. Blood test ranges don't seem to mean much as GPs only go by ranges which differ from area to area and not take into account patients' symptoms and their optimal range levels. Also with postmenopausal women there is a higher risk of breast cancer if the Free T3 is not above the lower tertile and preferably in the upper tertile (33%).
I read that T3 is dependent on ZINC for conversion. Minerals aren't normally tested but so important e.g. selenium, zinc,calcium, phosphorous, magnesium and vit D which if off there's a chance of parathyroid not functioning. Lack of T3 and T4 alters fat metabolism and lead to furring of coronary arteries and reduction of blood supply to heart muscle. low levels of Selennium cause inactivity of T3.