Radioactive Iodine Uptake Testing Periprocedural Care

Updated: Dec 05, 2022
  • Author: Augustine George, MD; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Periprocedural Care

Approach Considerations

Make sure patient has not received any thyroid hormone or an antithyroid medication. This includes excess iodine ingestion and intravenous iodine contrast material [3] .

Laboratory exclusion of pregnancy and clinical exclusion of lactation are required.

Have in hand any prior studies for comparison. Also have the patient’s baseline TSH level prior to administration of radioactive iodine.



Instruments used in radioactive iodine uptake testing include the following: [3]

  • The simplest one is a probe with a single thallium activated sodium iodide crystal.

  • For routine diagnostic purposes, a gamma camera with a pin-hole collimator is used.

  • Fluorescent scanners detect nonradioactive iodine-127.

  • Handheld detectors are used in patients treated with131 I and that radio nucleotide is used as a local map for the surgeon as an aid to determine excision of potential thyroid tissue or metastatic thyroid cancer.