Parameter Included: 1
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BI087 - FREE THYROXINE(FT4), SERUM Detail
Parameter Included:
1
Sample Collection
Free
Doctor Consultation
Free
Test booked
100+
Report Time
3-4 Hrs
Fasting Time
Test Recommended
Male,Female
Recommended age
0-99 Years
The Serum Free Thyroxine (FT4) test is a laboratory blood test used to measure the level of free (unbound) thyroxine hormone in the bloodstream. FT4 is one of the main hormones produced by the thyroid gland and plays a crucial role in regulating metabolism, energy levels, body temperature, heart function, and overall growth and development. The “free” portion represents the biologically active hormone that is available to body tissues, making this test more accurate for assessing true thyroid status compared to total T4. The FT4 test is commonly advised in the evaluation and monitoring of thyroid disorders such as hypothyroidism, hyperthyroidism, goiter, and pituitary gland dysfunction, as well as during thyroid hormone therapy. Abnormal FT4 levels may indicate an underactive or overactive thyroid gland, and results are typically interpreted along with TSH and FT3 levels for accurate clinical diagnosis.
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What are the symptoms of low t4?
"The following symptoms may indicate too little T3 and T4 in your body (hypothyroidism): trouble sleeping, tiredness and fatigue, difficulty concentrating, dry skin and hair, depression, sensitivity to cold temperature, frequent, heavy periods, joint and muscle pain."
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What is normal range for TSH and free t4?
"Normal values for TSH are 0.5 to 5.0 mIU/L. Pregnancy, a history of thyroid cancer, history of pituitary gland disease, and older age are some situations when TSH is optimally maintained in different ranges as guided by an endocrinologist. FT4 normal values are 0.7 to 1.9ng/dL."
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How many hours fasting is required for thyroid test?
"Generally, you don't need to fast before doing a thyroid function test. However, not fasting is sometimes linked to a lower TSH level. This means your results might not pick up on mild (subclinical) hypothyroidism - where your TSH levels are only mildly elevated."
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What are some things that could cause low levels of t3 and t4?
"The commonest ones are Hashimoto's Disease. Some more are surgery on the thyroid gland, treatment with radiation, thyroid swelling, medicines, too little or too much Iodine, hypothyroidism at birth, damage to the pituitary gland."