Free Thyroxine
Laboratory Tests
estimated about CNY 50-200
(estimated about USD 8-30)
1 day
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Description
Free thyroxine (FT4) testing measures active thyroid hormone levels to diagnose or monitor thyroid disorders like hypothyroidism or hyperthyroidism; in China, costs typically range ¥8–30 with results in 1–3 days, and ChinaMedicalHub assists with hospital booking and interpreter support.
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