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https://www.healthtap.com/questions/160609-what-does-abnormal-uptake-on-a-thyroid-nuclear-scan-mean/#:~:text=In%20the%20usa%2C%20the%20normal%20thyroid%20uptake%20range,thyroiditis%2C%20iodine%20or%20amiodarone%20induced%20thyrotoxicosis%20among%20others.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1501450/
The range of values for the 24-hour thyroidal accumulation of radioactive iodine in euthyroid persons varies with geographic location. In the San Bernardino Valley region of Southern California the “normal range” is 6 percent to 33 percent in euthyroid subjects. This is lower than in studies from other areas of the United States.
https://www.uclahealth.org/endocrine-center/radioactive-iodine-uptake-test
This test is performed to evaluate thyroid function, particularly when blood tests of thyroid function (for example, T3 or T4 levels) have abnormal results. Normal Values: 6 hours: 3 to 16% 24 hours: 8 to 25% Note: Some laboratories only measure at 24 hours.
https://files.verywellhealth.com/Thyroid+Tests+and+Results.pdf
A normal or high increase in TSH levels is an indication that the pituitary gland is able to release TSH normally, and that pituitary disease is not the cause of hypothyroidism. THYROID TESTS Radioactive Iodine Uptake (RAIU) at 6 or 24 hours Optimal range at 6 hours: 3 –16% Optimal range at 24 hours: 8 –25%
https://pubmed.ncbi.nlm.nih.gov/7387268/
The normal range defined in 100 euthyroid subjects was 1% to 8.8% at two hours, and 4% to 27% for the 24-hour uptake. These results are significantly lower than observed eight years ago in this area. No relationship was noted between uptake values and thyroid indices, age, sex, ponderal index, estrogen ingestion, or urinary iodine excretion.
https://medlineplus.gov/ency/article/003689.htm
Expand Section. These are normal results at 6 and 24 hours after swallowing the radioactive iodine: At 6 hours: 3% to 16%. At 24 hours: 8% to 25%. Some testing centers measure only at 24 hours. Values may vary depending on the amount of iodine in your diet. Normal value ranges may vary slightly among different labs.
https://www.ncbi.nlm.nih.gov/books/NBK559314/
Sample normal RAIU ranges could be 6-18% at 4 hours and 10 to 35% at 24 hours. Thyrotoxicosis can be defined as a clinical state in response to an elevated thyroid hormone, which may be due to inappropriately elevated secretion or synthesis of thyroid hormone.
https://jnm.snmjournals.org/content/59/supplement_1/1317
1317 Background: : 24-hour iodine-123 sodium iodide thyroid uptake is widely accepted as a standard measure of thyroid function in clinical practice. Previous joint publications by the American College of Radiology (ACR), Society of Pediatric Radiology (SPR), and Society of Nuclear Medicine (SNM) provide guidelines for thyroid uptake measurement …
https://www.healthtap.com/questions/160609-what-does-abnormal-uptake-on-a-thyroid-nuclear-scan-mean/
In the usa, the normal thyroid uptake range is approximately 10-30% at 24 hours. An increased result may be due to various reasons including: grave's disease, multinodular toxic goiter or hashitoxicosis. A decreased uptake could be due to subacute thyroiditis, iodine or amiodarone induced thyrotoxicosis among others.
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