PTH and parathyroid gland adenoma: Barczynski et al. reported that among 50 patients who had a solitary parathyroid adenoma, true-positive results for the detection of the adenomas could be obtained for 33.33% (8/24) of patients who underwent only US and 65.4% (17/26) of patients who underwent US combined with bilateral internal jugular venous sampling with rapid PTH assay27.