LOW TOTAL THYROXINE TEST RESULT REFERENT VALUES. What does lower total thyroxine (FT4) test result referent values level mean?

Lower limit of normal total thyroxine (FT4) test result referent values is 4 (μg/dL) - 60 (nmol/l).

Recomend a thyroid test for anyone who: has a family member with thyroid disease, has been diagnosed with chronic fatigue syndrome is a woman in or near menopause, has recently given birth, has other pituitary or endocrine disease, or is experiencing symptoms of thyroid disease

Total T4 levels offer a good index of thyroid function when the thyroid-binding globulin is normal and nonthyroidal illness is not present