I have taken Armour Thyroid for about 4 months now started out on 30 my tsh was 2 my free t4 was low .80 and my t3 was normal. increased dose due to pregnancy to 45 my tsh is now under 1 my t3 is still in normal range but my free t4 is now .70 why does it keep lowering when my dose is increased?
This is what is meant to happen.
The thyroid gland is part of the endocrine system. The thyroid's job is to make thyroid hormones (t3 & t4), which are secreted into the blood and then carried to tissue around the body. Thyroid hormone helps the body use energy, stay warm and keeps the brain, heart, muscles, and other organs working as they should.
The functioning of the thyroid gland is regulated by the pituitary gland - a small endocrine gland attached to the base of the brain. The pituitary gland produces thyroid stimulating hormone (TSH), which stimulates the thyroid gland to produce thyroid hormones in response to the body's needs.
The pituitary and the thyroid gland operate on a negative feed-back system.
In your instance by increasing the dose of Armour thyroid (thyroid hormones) the pituitary gland recognises that the thyroid hormone levels have increased so responds by reducing the amount of TSH (thyroid stimulating hormone) it secretes. Hope this helps.
- Armour Thyroid Information for Consumers
- Armour Thyroid Information for Healthcare Professionals (includes dosage details)
- Side Effects of Armour Thyroid (detailed)
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