title: Applicability of tissue aspirate for quick parathyroid hormone assay to confirm parathyroid tissue identity during parathyroidectomy for primary hyperparathyroidism.
abstract: OBJECTIVE
  Intraoperative quick parathyroid hormone (PTH) assay for tissue aspirate facilitates the confirmation of parathyroid tissue identity and allows a more selective use of frozen section examination during parathyroidectomy for primary hyperparathyroidism.
  
  
  METHODS
  A retrospective review of a prospective protocol of the applicability and accuracy of quick PTH assay for tissue aspirate as a biochemical frozen section tool.
  
  
  METHODS
  A university hospital department of surgery.
  
  
  METHODS
  Quick PTH assay for aspirate obtained from suspected parathyroid gland excised during parathyroidectomy for primary hyperparathyroidism.
  
  
  METHODS
  The accuracy of this biochemical identification of parathyroid tissue identity was correlated with histological examination and outcome.
  
  
  RESULTS
  Quick PTH assay was performed for aspirate from at least 1 excised parathyroid gland in 122 (98%) of 125 patients while 13 patients (10%) had PTH aspirate for nonparathyroid tissues including thyroid (n = 10), thymic (n = 2) and lymphatic (n = 1) tissues. Frozen section examination was performed for 15 patients (12%), including the 3 patients who did not undergo tissue aspirate for quick PTH assay. All except 3 patients had an aspirate assay value of greater than 1500 pg/mL (range, 625 to >1500 pg/mL) for parathyroid tissue while the value of PTH aspirate for nonparathyroid tissue ranged from 27 to 229 pg/mL (median, 72 pg/mL) in 13 patients. The median size of abnormal parathyroid gland was 70 to 15,000 mg (median, 775 mg).
  
  
  CONCLUSIONS
  With the availability of quick PTH assay, tissue aspirate for PTH assay can be adopted as an alternative to traditional frozen section examination to confirm parathyroid gland identity. Frozen section examination can be employed more selectively.
authors.affiliation: Department of Surgery, University of Hong Kong Medical Centre, Queen Mary Hospital, Hong Kong, China. cylo@hkucc.hku.hk
authors.forename: Chung-Yau
authors.initials: CY
authors.lastname: Lo
authors.forename: Wai-Fan
authors.initials: WF
authors.lastname: Chan
authors.forename: Pauline
authors.initials: P
authors.lastname: Leung
authors.forename: John M
authors.initials: JM
authors.lastname: Luk
mesh_terms: D000236:Adenoma / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005629:Frozen Sections; D006801:Humans; D006961:Hyperparathyroidism / Q000601:surgery*; D007118:Immunoassay; D007432:Intraoperative Period; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures; D010281:Parathyroid Hormone / Q000032:analysis*; D010282:Parathyroid Neoplasms / Q000601:surgery; D016105:Parathyroidectomy / Q000379:methods; D012189:Retrospective Studies; D012680:Sensitivity and Specificity
chemical_list: D010281:Parathyroid Hormone