THYROID FUNCTION TEST- FREE
Pre-test preparation or requirements
• Sample can be drawn at any time. No fasting or special preparation required.
• Blood sample should taken in plain vial.
Tests included in package
TSH- Thyroid stimulating hormone
FT3- Free Triiodothyronine
FT4- Free Thyroxine
Significance of package
RBL free thyroid function test is useful for helping in screening, diagnosis, monitoring of thyroid diseases:
Serum FT3, FT4 & TSH measurements form the three components of Thyroid screening panel, useful in diagnosing various disorders of Thyroid gland function.
Primary hypothyroidism is accompanied by depressed serum FT3 and FT4 values and elevated serum TSH level.
Primary hyperthyroidism is accompanied by elevated serum FT3 and FT4 levels along with depressed TSH values.
Normal FT4 levels are accompanied by increased FT3 in patients with FT3 thyrotoxicosis.
Slightly elevated FT3 levels may be found in pregnancy and estrogen therapy, while depressed levels may be encountered in severe illness, renal failure and during therapy with drugs like propranolol and propyl thiouracil.
Although elevated TSH levels are nearly always indicative of primary hyporthyroidism, and may be seen in secondary thyrotoxicosis.