Triiodothyronine (T3), Free (Free T3) LabCorp

Testing your Free T3 level helps check your thyroid function, which can cause symptoms like anxiety, fatigue, and weight changes. This test from Defy Medical can help pinpoint if an overactive thyroid is the cause of your symptoms. Understanding your thyroid levels is key to finding the right treatment.

Finding the cause(s) of:

• Anxiety: Checking your Free T3 level can help determine if an overactive thyroid is contributing to feelings of anxiety.
• Fatigue: Thyroid hormone imbalances, including Free T3 levels, can cause fatigue, and this test helps investigate that possibility.
• Heat intolerance: An overactive thyroid, indicated by Free T3 levels, can make you feel overly sensitive to heat.
• Rapid heartbeat: High Free T3 levels can indicate an overactive thyroid, which often causes a rapid or irregular heartbeat.
• Tremors: An overactive thyroid, which can be identified by checking your Free T3 level, is a common cause of tremors or shakiness.
• Weight loss: Unexplained weight loss can be a symptom of an overactive thyroid, and checking your Free T3 level helps determine if this is the cause.