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This series is one of the largest to date that prospectively compares the use of sestamibi scanning, radioguided surgery, and ioPTH testing. Of all the perioperative adjuncts used during parathyroid surgery, ioPTH testing has the highest sensitivity, positive predictive value, and accuracy. Thus, the inherent variability of sestamibi scanning and radioguided techniques emphasizes the critical role of ioPTH testing during parathyroid surgery.

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In patients with hyperparathyroidism, radioguided surgery is a sensitive adjunct for the intraoperative localization of both adenomatous and hyperplastic glands. In this series, all 180 enlarged parathyroids were located with the gamma probe. We have also shown that the ">20% rule" for ex vivo counts not only applies to parathyroid adenomas but also to hyperplastic glands. Therefore, radioguided resection is equally effective and informative for both adenomatous and hyperplastic glands.

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