T3 and T4
Also known as T3 And T4 BloodWhat is this test?
The function of the thyroid gland is to take iodine, found in many foods, and convert it into thyroid hormones: thyroxine (T4) and triiodothyronine (T3). Thyroid cells are the only cells in the body which can absorb iodine. These cells combine iodine and the amino acid tyrosine to make T3 and T4. T4 being the inactive form, and T3 being the active form of thyroid hormone. The function of the thyroid gland is to take iodine, found in many foods, and convert it into thyroid hormones: thyroxine (T4) and triiodothyronine (T3).Thyroid cells are the only cells in the body which can absorb iodine.
Test Preparation
Inform your doctor if you are on any medications, have any allergies or underlying medical conditions before your T3 and T4. Your doctor will give specific instructions depending on your condition on how to prepare for T3 and T4.
10 to 12 Hours fasting is required before the sample collection.
Understanding your test results
| Gender | Age groups | Value |
| UNISEX | All age groups | 80 - 200ng/dl |
| UNISEX | All age groups | 4.5 - 11.7 mcg/dl |