Types

• Triiodothyronine (T3) is one of the two major hormones produced by the Thyroid Gland. Almost all of the T3 found in the blood is bound to protein; the rest is free (Unbound) and is the biologically active form of the hormone. T3 levels are regulated by the feedback system that the body uses to maintain stable amounts of Thyroid hormones in...

Description

• 60-200 ng/dl

Paediatric normal range

• 1-3 days-100 to 740 ng/dl
• 1-11 months -105 to 245 ng/dl

When to get Tested

• When there are s/s of Hyperthyroidism (Increased heart rate, Anxiety, weight loss, difficulty sleeping, tremors in the hands, weakness, Menstrual irregularity

Elevated Level

• Hyperthyroidism
• Inadequately treated Hyperthyroidism
• Excessive treatment for Hypothyroidism
• Patients on T3 treatment
• T3 Toxicosis

Decreased Level

• Depressed levels may occur during severe illness
• Malnutrition
• Renal failure
• During therapy with antithyroid drugs propranolol, propylthiouracil and salicylates
• Euthyroid sick syndrome