Radioactive iodine uptake (RAIU)
Frequently Asked Questions
The Radioactive Iodine Uptake (RAIU) test is a medical technique that determines how much radioactive iodine the thyroid gland absorbs. It gives useful information regarding thyroid gland function and aids in the diagnosis of various thyroid disorders.
Here are a few probable explanations for a low RAIU count:
- Hypothyroidism is a condition in which the thyroid gland is underactive and generates inadequate thyroid hormones. This condition is related to a low RAIU count.
- Thyroiditis is an infection of the thyroid gland that can be caused by a variety of reasons. The RAIU count may be low in various kinds of thyroiditis, such as Hashimoto’s thyroiditis.
- Specific medicines, such as specific thyroid medications or iodine-containing pharmaceuticals, might interfere with the thyroid gland’s absorption of radioactive iodine, resulting in a low RAIU count.
If the RAIU count is high, it means the thyroid gland is absorbing and using more iodine than usual. This might be a sign of a disorder like hyperthyroidism, which is defined by an overactive thyroid gland. Graves’ disease, toxic multinodular goiter, or thyroiditis are all potential causes of hyperthyroidism.
Iodine is required by the thyroid gland to create thyroid hormones such as thyroxine (T4) and triiodothyronine (T3). The RAIU test includes giving the patient a tiny, safe amount of radioactive iodine (typically iodine-131) orally or by injection. The thyroid gland then absorbs the radioactive iodine.
The RAIU count is the proportion of radioactive iodine taken up by the thyroid gland within a specified time frame, which is commonly assessed at 2, 6, 24, and sometimes 48 hours following radioactive iodine delivery. RAIU’s normal range varies, however it normally ranges between 10% and 35%.