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TSH is a hormone produced by the pituitary gland. It stimulates the thyroid gland to produce thyroid hormones. Low levels of TSH can lead to hypothyroidism, which can cause symptoms such as fatigue, weight gain, and cold intolerance.

Free T3 is a type of thyroid hormone that is active in the body. It plays a role in regulating metabolism, energy levels, and body temperature. Low levels of Free T3 can lead to hypothyroidism symptoms.

Free T4 is another type of thyroid hormone that is active in the body. It is converted to Free T3 in the body. Low levels of Free T4 can also lead to hypothyroidism symptoms.

TPO antibodies are antibodies that attack the thyroid gland. They can cause hypothyroidism.

Thyroglobulin antibodies are antibodies that attack the thyroglobulin protein. Thyroglobulin is a protein that is used to make thyroid hormones. They can cause hypothyroidism.

Serum iron is the level of iron in the blood. Low levels of serum iron can lead to iron deficiency anemia, which can cause symptoms such as fatigue, shortness of breath, and pale skin.

Iodine is a mineral that is essential for the production of thyroid hormones. Low levels of iodine can lead to goiter, which is an enlargement of the thyroid gland.

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