The use of the 99mTc-pertechnetate neck/thigh ratio as a test of thyroid function.
A total of 100 patients were studied by standard thyroid function tests and the 99mTc-pertechnetate neck/thigh ratio was determined. This ratio or "trapping index" correlated closely with 131I uptake. The 99mTc test should be followed by scanning at 20 minutes to distinguish diffuse from localized thyroid disease. TSH stimulation and suppression studies can be done. It is recommended that this ratio be used in place of the standard 24-hour RAIU study, as it gives the same information at a saving in time, money, and radiation exposure.
D006801:Humans; D009333:Neck; D011877:Radionuclide Imaging; D013667:Technetium; D013848:Thigh; D013959:Thyroid Diseases / Q000175:diagnosis; D013960:Thyroid Function Tests
D013667:Technetium