The 5-time point oral glucose tolerance test as a predictor of new-onset diabetes after kidney transplantation

Kazuaki Tokodai, Noritoshi Amada, Izumi Haga, Tetsuro Takayama, Atsushi Nakamura

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Aims: To evaluate the predictive power of the 5-time point oral glucose tolerance test (OGTT) for new-onset diabetes after kidney transplantation (NODAT). Methods: We performed a retrospective study of 145 patients without diabetes who received kidney transplantations at our hospital. The 5-time point OGTT was performed before transplantation. The area under a receiver-operating characteristic curve (aROC) was used for evaluating the predictive power of 5-time point OGTT values. Results: Seventeen patients developed NODAT within 1 year after transplantation. All postload plasma glucose (PPG) levels were higher in patients who developed NODAT than in those who did not; fasting plasma glucose levels were not different. The aROC for the area under the glucose concentration-time curve was significantly greater than that for fasting plasma glucose. Univariate and multivariate analyses showed that each PPG level was an independent risk factor for NODAT. Furthermore, patients with normal glucose tolerance (NGT) or impaired glucose tolerance (IGT) could be stratified with a 1-h plasma glucose (1h-PG) cut-off point of 8.4. mmol/L. The incidences of NODAT were 23.5%, 16.7%, 9.1%, and 0% for patients with IGT. +. 1h-PG ≥8.4. mmol/L,IGT. +. 1h-PG <8.4. mmol/L, NGT. +. 1h-PG ≥ 8.4. mmol/L, and NGT. +. 1h-PG. <. 8.4. mmol/L, respectively. Conclusions: The area under the glucose concentration-time curve and each PPG concentration during the 5-time point OGTT are strong predictors of NODAT. A 1h-PG cut-off point of 8.4. mmol/L plus NGT/IGT can be used to identify patients at intermediate and high risk of developing NODAT.

Original languageEnglish
Pages (from-to)298-303
Number of pages6
JournalDiabetes Research and Clinical Practice
Volume103
Issue number2
DOIs
Publication statusPublished - 2014 Feb
Externally publishedYes

Keywords

  • Area under a glucose concentration-time curve
  • Five-time point oral glucose tolerance test
  • Kidney transplantation
  • New-onset diabetes after transplantation
  • Postload plasma glucose concentration/

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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