Free T4 (FT4)

To take the blood sample, a tourniquet (elastic) band is placed tightly on the upper arm. The patient is asked to make a fist. This helps in the buildup of blood filling the veins and it becomes easy to collect the blood. The skin is cleaned before inserting the needle in the vein in order to prevent bacteria from entering. The needle is then inserted into the vein in the arm and the blood sample is collected in the vacutainer.

Hypothyroidism refers to an underactive thyroid. It is a condition in which the thyroid gland is not able to produce sufficient thyroid hormones. The symptoms of hypothyroidism are not noticeable at an early stage. If left untreated, it can cause various health problems that include obesity, joint pain, infertility, and heart disease. \Hyperthyroidism refers to an overactive thyroid. It is a condition in which the thyroid gland produces an excess of thyroid hormones. Hyperthyroidism can occur due to various conditions such as Grave’s disease, consuming excess iodine, inflammation of thyroid gland (thyroiditis), tumors of ovaries or testes, benign tumors of the thyroid or pituitary gland, and in cases if large amount of T4 is consumed through dietary supplements or medication.

The signs of an underactive thyroid include slow heart rate, weight gain, enlarged thyroid, dry skin, constipation, trouble tolerating cold, pain in the muscle and joints, puffy skin, thinning of hair, hair loss, fatigue, depression, forgetfulness, heavy or irregular menstrual periods, and infertility in women.

The signs of an overactive thyroid include rapid heart rate, anxiety, weight loss, difficulty in sleeping, tremors in the hands, muscle weakness, increased sweating, difficulty in tolerating heat, frequent bowel movements, puffiness around the eyes, dryness, irritation, excessive tearing, sensitivity to light, blurry double vision, bulging of eyes, and lighter or less frequent menstrual periods in women.

Yes, please inform your doctor if you are taking any medicines or supplements as it might interfere with the test results.