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The Longitudinal PTH-Study

NCT03464149 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 132

Last updated 2020-06-25

No results posted yet for this study

Summary

The main study aim is to quantify the agreement between the analytical results provided by two third generation and two second generation Parathyroid hormone (PTH) assays. The primary comparison will be performed between the second-generation PTH assay"Intact PTH assay" from Siemens Healthcare Diagnostics Inc. and the third-generation PTH assay "biointact (1-84)" from Roche Diagnostics in terms of a Bland-Altman analysis. Several studies have evaluated the correlation between various PTH assays at a single time-point, but no previous study has tested the hypothesis that longitudinal changes in PTH levels, which are important for making treatment decisions, can be monitored by several PTH assays alike. To this aim, the key secondary objective is to analyze the longitudinal variance in PTH over the course of 1 year, using each of two assays of the second and third generations, respectively. Other secondary objectives include determining changes in serum phosphate, serum calcium, fibroblast growth factor 23 (FGF23), with respect to treatment decisions. For clinical applicability of the results to be obtained here, an important goal of the present study will be not to influence treatment decisions, which will remain independent of the study investigators, at the full responsibility of the hemodialysis physicians.

At every quarterly blood draw over the course of one year, the investigators will freeze the serum from 100 patients, and at the end of 4 quarters the investigators will analyze PTH-levels using the following assays: Intact Parathyroid Hormone (Advia Centaur, Siemens Healthcare), PTH-Intact (Cobas, Roche), PTH (1-84) - The agreement between the PTH assays will be analyzed at baseline, as well as at the subsequent quarterly evaluation time-points by Bland-Altman analysis and complemented by Passing-Bablok regression. The longitudinal changes in PTH will be displayed graphically and analyzed by estimating the within-patient variance across time, the between patient variance at each time-point as well as effects on the mean log-PTH level due to course of disease and therapeutic interventions from a linear mixed model.

Conditions

  • CKD-MBD - Chronic Kidney Disease Mineral and Bone Disorder
  • Secondary Hyperparathyroidism
  • Kidney Replacement

Interventions

DIAGNOSTIC_TEST

One armed study, blood from each patient is analysed by four assays ( two 3rd generation and two 2nd generation assays)

Intact PTH Assay (Siemens Healthcare Diagnostics Inc); LIAISON 1-84 PTH Assay (Diasorin); PTH (1-84), biointact (Roche Diagnostics); PTH, intact (Roche Diagnostics)

Sponsors & Collaborators

  • Medical University of Vienna

    lead OTHER

Principal Investigators

  • Manfred Hecking, M.D. · Medical University of Vienna, Department of Nephrology and Dialysis

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2018-03-20
Primary Completion
2018-12-05
Completion
2019-08-07

Countries

  • Austria

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03464149 on ClinicalTrials.gov