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More specifically, optimal levels are generally close to a central tendency of the values found in the population. However, usual and optimal levels may differ substantially, most notably among vitamins and blood lipids, so these tables give limits on both standard and optimal (or target) ranges.
Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid. [1] TFTs may be requested if a patient is thought to suffer from hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or hormone replacement therapy.
Thyroxine, also known as T 4, is a hormone produced by the thyroid gland. It is the primary form of thyroid hormone found in the blood and acts as a prohormone of the more active thyroid hormone, triiodothyronine (T 3 ). [ 1 ]
In overt primary hyperthyroidism, TSH levels are low and T 4 and T 3 levels are high. Subclinical hyperthyroidism is a milder form of hyperthyroidism characterized by low or undetectable serum TSH level, but with a normal serum free thyroxine level. [32]
Subclinical hypothyroidism is a biochemical diagnosis characterized by an elevated serum TSH level, but with a normal serum free thyroxine level. [48] [49] [50] The incidence of subclinical hypothyroidism is estimated to be 3-15% and a higher incidence is seen in elderly people, females and those with lower iodine levels. [48]
Thyroxine (FT4) free 8-24 × 10 −12: total 4-12 × 10 −8: Thyroxine-binding prealbumin: 2.8-3.5 × 10 −4: Thyroxine-binding globulin: 1.0-3.4 × 10 −7: Tin: 0-4 × 10 −7: 0-1 × 10 −7: alpha-Tocopherol (Vitamin E) 5-20 × 10 −6: Transcortin: male 1.5-2 × 10 −5: female 1.6-2.5 × 10 −5: Transferrin: newborn 1.3-2.75 × 10 −3 ...