title: Potency and tolerance of calcitonin stimulation with high-dose calcium versus pentagastrin in normal adults.
abstract: OBJECTIVE
  The objectives of the study was to compare pentagastrin- and calcium-stimulated serum human calcitonin (hCT) levels for nonsmoking healthy adults without evidence of thyroid disorders and determine reference ranges of basal and pentagastrin- and calcium-stimulated serum hCT levels.
  
  
  METHODS
  This was a healthy volunteer study including within-group and intergroup comparisons.
  
  
  METHODS
  The study was conducted at a tertiary referral center.
  
  
  METHODS
  Subjects included 50 healthy, nonsmoking volunteers (25 female; aged 22-57 yr) without evidence of thyroid abnormality.
  
  
  METHODS
  hCT was measured using a calcitonin two-site automated chemiluminescent immunometric assay (the most common hCT assay in clinical practice) in serum samples obtained before and 2, 5, and 15 min after iv stimulation using pentagastrin, 0.5 microg/kg body weight, or calcium gluconate, 2.5 mg/kg.
  
  
  METHODS
  Reference ranges for basal, unstimulated, and pentagastrin- or calcium-stimulated hCT and pentagastrin and calcium tolerability in healthy adults were measured.
  
  
  RESULTS
  The 95th percentile basal hCT values did not differ between males and females (5.0 vs. 5.7 pg/ml). The 95th percentile maximal stimulated hCT values rose distinctly after pentagastrin (peak men, 37.8 pg/ml; women, 26.2 pg/ml) and even more so after calcium (peak men, 131.1 pg/ml, women, 90.2 pg/ml). No hCT increase was detected in four of 25 men and 12 of 25 women after pentagastrin vs. none of 24 men and two of 18 women after calcium. Calcium was associated with fewer and less intense adverse effects than was pentagastrin.
  
  
  CONCLUSIONS
  High-dose calcium is a more potent and better-tolerated hCT stimulator than is pentagastrin. The reference ranges for basal and stimulated hCT established via automated chemiluminescent assay were lower than those reported for other assays.
authors.affiliation: Department of Nuclear Medicine, University of Würzburg, Josef-Schneider-Strasse 2, Würzburg, Germany.
authors.forename: Patricia
authors.initials: P
authors.lastname: Doyle
authors.forename: Christian
authors.initials: C
authors.lastname: Düren
authors.forename: Kai
authors.initials: K
authors.lastname: Nerlich
authors.forename: Frederik A
authors.initials: FA
authors.lastname: Verburg
authors.forename: Inge
authors.initials: I
authors.lastname: Grelle
authors.forename: Hanne
authors.initials: H
authors.lastname: Jahn
authors.forename: Martin
authors.initials: M
authors.lastname: Fassnacht
authors.forename: Uwe
authors.initials: U
authors.lastname: Mäder
authors.forename: Christoph
authors.initials: C
authors.lastname: Reiners
authors.forename: Markus
authors.initials: M
authors.lastname: Luster
mesh_terms: D000328:Adult; D002116:Calcitonin / Q000097:blood*; D002118:Calcium / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008163:Luminescent Measurements; D008297:Male; D008875:Middle Aged; D010418:Pentagastrin / Q000494:pharmacology*; D012016:Reference Values; D012727:Sex Characteristics
chemical_list: D002116:Calcitonin; D010418:Pentagastrin; D002118:Calcium