RAIU Test — Radioactive Iodine Uptake Purpose:-The RAIU test measures how much radioactive iodine the thyroid gland absorbs from the bloodstream. It helps assess thyroid function, especially in hyperthyroidism, and to differentiate different causes of thyrotoxicosis. How the Test is Done 1.Patient swallows a small capsule or liquid containing radioactive iodine (usually I-123 or sometimes I-131). 2.After 2–4 hours and again at 24 hours, a gamma probe is placed over the neck to measure how much o

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