The Radioactive Iodine Uptake Test (RAIU) is a diagnostic procedure used to evaluate thyroid function. It measures how well the thyroid gland absorbs iodine, which is essential for the production of thyroid hormones. This test is crucial for diagnosing conditions like hyperthyroidism and Graves’ disease.
Indications for Radioactive Iodine Uptake Test:
● Hyperthyroidism: The RAIU test helps diagnose Graves’ disease, toxic multinodular goiter, and toxic adenoma.
● Thyroid function assessment: Used to evaluate thyroid health when there are symptoms of overactive or underactive thyroid.
● Pre-surgical assessment: Often performed before thyroid surgery to evaluate the thyroid gland’s ability to absorb iodine.
How Radioactive Iodine Uptake Test Works:
● A small dose of radioactive iodine (I-131) is administered, either orally or intravenously. The thyroid gland absorbs the iodine, and a gamma camera measures the uptake to determine if the thyroid is functioning properly.
Normal Range:
● Normal uptake: Typically, 10-30% of the iodine is absorbed by the thyroid gland within 24 hours.
● Abnormal uptake: Abnormal levels may indicate hyperthyroidism or other thyroid disorders.
Abnormal Test Significance:
● High uptake: Suggests hyperthyroidism, such as Graves’ disease or toxic adenoma.
● Low uptake: Could indicate hypothyroidism or thyroiditis.
● No uptake: Can suggest thyroid gland damage or thyroid cancer.
Management Based on Results:
● For high uptake: Treatment may include antithyroid medications, radioactive iodine therapy, or surgery.
● For low uptake: Treatment will focus on hormone replacement therapy or addressing the underlying cause of hypothyroidism.
Price in India:
Approx. ₹5,000 – ₹12,000 for a radioactive iodine uptake test, including scanning.
Frequently Asked Questions
Is the radioactive iodine uptake test safe?
- Yes, the test uses a very small amount of radiation that is safe for most individuals, though it is generally avoided during pregnancy.
How long does it take to get results?
Results are usually available within 24-48 hours after the test.
Disclaimer: The radioactive iodine uptake test is part of a comprehensive diagnostic workup for thyroid disorders. Further tests and clinical evaluations are needed to confirm the diagnosis.
How HealthPil Can Help:
HealthPil connects you with endocrinologists who can help interpret your radioactive iodine uptake test results and recommend appropriate treatments for thyroid conditions.