Free Thyroxine
Laboratory Tests
≈ ¥20-50
(≈ $3-7)
2 hr
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Description
Estimated cost for Free Thyroxine at general public hospitals in China is about ¥15-40, and at Grade 3A hospitals about ¥20-50, varying by hospital tier and region.
Main Uses
Diagnosing and monitoring thyroid disorders such as hypothyroidism and hyperthyroidism, evaluating the effectiveness of thyroid replacement therapy, and assessing thyroid function in patients with suspected pituitary or hypothalamic diseases
Normal Range
The normal range for Free Thyroxine (FT4) is typically between 0.8 to 1.8 ng/dL (nanograms per deciliter), though this can vary slightly depending on the laboratory and the specific measurement method used.
Low Values - Possible Causes
Hypothyroidism, iodine deficiency, pituitary gland dysfunction, certain medications (such as lithium or amiodarone), and thyroiditis
High Values - Possible Causes
Hyperthyroidism, Graves' disease, toxic multinodular goiter, excessive intake of thyroid hormone medication, and thyroid adenoma