16 Silverberg Silverberg SJ SJ Gao Gao P P Brown Brown I I LoGerfo LoGerfo P P Cantor Cantor TL TL Bilezikian Bilezikian JP JP Clinical utility of an immunoradiometric assay for parathyroid hormone (1-84) in primary hyperparathyroidism Clinical utility of an immunoradiometric assay for parathyroid hormone (1-84) in primary hyperparathyroidism J Clin Endocrinol Metab. Here, PTH is linked to primary hyperparathyroidism.