Feeling tired, gaining weight, or experiencing brain fog? The Thyroid Function Profile (TFP) provides the complete, comprehensive answer. While a TSH test is a great start, this full panel measures TSH, Free T3, and Free T4—the key hormones that regulate your body's entire metabolism. It gives your doctor the complete, dynamic picture needed to definitively diagnose an underactive (hypo) or overactive (hyper) thyroid and fine-tune your treatment. A single blood draw provides this vital, in-depth information. This is the gold-standard package. Stop guessing and get the full picture.