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FT4

FT4

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The FT4 (Free Thyroxine) Test measures the level of free thyroxine, a thyroid hormone that is not bound to proteins in the blood. This test is essential for evaluating thyroid function and diagnosing disorders such as hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid), as free thyroxine plays a crucial role in regulating metabolism, energy levels, and overall health. The test involves drawing a blood sample, which is then analyzed in a laboratory to determine the concentration of free thyroxine.


Typically, the FT4 test is performed once if there is a suspicion of thyroid dysfunction. If you are undergoing treatment or monitoring a thyroid condition, your healthcare provider may recommend repeating the test periodically. Depending on the results, follow-up tests or additional thyroid function assessments, such as TSH, may also be suggested by your healthcare provider.

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Test Requirements

Fasting: Not required.

Sample Type: Blood sample.

Preparation: No specific preparation is needed. However, inform your healthcare provider about any medications or supplements you are taking, as certain drugs can affect FT4 levels.

Timing: The test can be done at any time of the day.

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Find the best FT4 price in the Philippines. The FT4 (Free Thyroxine) Test measures the level of free thyroxine, which is a critical thyroid hormone that affects thyroid function and metabolic processes. This test is essential for diagnosing thyroid disorders such as hypothyroidism and hyperthyroidism. If you experience symptoms like cold intolerance, dry skin, fatigue, mood changes, or weight fluctuations, your healthcare provider may recommend this test. The FT4 test is performed by drawing a blood sample that is then analyzed in a laboratory to check the levels of free thyroxine. This helps in assessing your overall health and determining any thyroid dysfunction. Depending on initial results, further assessments such as TSH may be necessary. Repeating the FT4 test can be beneficial if you are monitoring a thyroid condition. Understanding your free thyroxine levels is crucial for managing symptoms like abnormal heartbeat, weight loss, muscle weakness, hair thinning, depression, and energy levels.
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