Die fünf am häufigsten angewandten methoden zur bestimmung des intakten parathormons sind für das screening, nicht aber für die diagnose von knochenumbaustörungen bei CNI-5-patienten zweckdienlich

Translated title of the contribution: The five most commonly used intact parathyroid hormone assays are useful for screening but not for diagnosing bone turnover abnormalities in CKD-5 patients

J. Herberth, M. C. Monier-Faugere, H. W. Mawad, A. J. Branscum, Z. Herberth, G. Wang, T. Cantor, H. H. Malluche

Research output: Contribution to journalArticlepeer-review

Abstract

Background/aims: Assessment of bone turnover for management of renal osteodystrophy is part of routine care in chronic kidney disease Stage 5 (CKD-5) patients. Measurement of intact parathyroid hormone (iPTH) is the most commonly used surrogate marker for bone turnover in these patients. The current study was conducted to evaluate the predictive value of the five most commonly used iPTH assays for bone turnover. Methods: In a cross-sectional study, 84 CKD-5 patients underwent bone biopsy and blood drawings for determination of iPTH and total serum alkaline phosphatase (AP). Results: Histologically, patients presented with a broad range of bone turnover abnormalities as determined by activation frequency and bone formation rate/bone surface. Results of the five iPTH assays in each patient correlated but were significantly different. There were also significant differences between iPTH measurements at the same bone turnover level. Using Kidney Disease Outcome Quality Initiative recommended iPTH ranges, all assays showed comparably poor diagnostic performance. At 80% specificity, cut-off values of the five iPTH assays for low bone turnover varied from 165 pg/ml to 550 pg/ml and for high bone turnover from 404 pg/ml to 1,003 pg/ml. Sensitivities at these cut-offs remained below acceptable standards. Addition of AP measurements to iPTH did not improve diagnostic accuracy. Conclusions: Precise assessment of bone turnover will require utilization of established and novel bone markers reflecting effects of bone turnover rather than measuring only iPTH or other effectors.

Translated title of the contributionThe five most commonly used intact parathyroid hormone assays are useful for screening but not for diagnosing bone turnover abnormalities in CKD-5 patients
Original languageGerman
Pages (from-to)190-200
Number of pages11
JournalNieren- und Hochdruckkrankheiten
Volume40
Issue number5
DOIs
StatePublished - May 2011

Keywords

  • Alkaline phosphatase
  • Bone turnover
  • End-stage renal disease
  • K/DOQI
  • Parathyroid hormone
  • PTH assays
  • Renal osteodystrophy

ASJC Scopus subject areas

  • Internal Medicine
  • Nephrology

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