Background: In the context of fitness certification to hold the driving license, GGT and CDT have been used, sometimes in combination (gamma-CDT), to exclude chronic alcohol abuse. The present study was carried out with the aim of comparing the power of these biomarkers as tools for the objective screening of subjects at high risk of alcohol-associated traffic injuries. Methods: 288 male drivers admitted to hospital after traffic accidents were examined by determination of GGT, CDT and BAC. The degree of association of GGT, CDT and gamma-CDT with BAC was analysed using non-parametric statistics. Results: Partitioning the cases using the cut-off concentrations of 0.5 g/L for BAC (the legal limit adopted in most European countries), 55 U/L for GGT and 1.9% for CDT, a highly significant difference was found between the frequency of elevated GGT or CDT in cases where BAC was within the legal limits and those with elevated BAC values (Fisher's exact test: p < 0.001). However, the calculation of the odds ratio showed a much higher increase for CDT (28 times) than for GGT (6 times) in those drivers with a BAC above the Italian legal limit in comparison with those showing a BAC within the cut-off; conversely, gamma-CDT does not provide any significant advantage vs. CDT alone. Conclusions: Both GGT and CDT provide objective evidence of an association with the occurrence of alcoholrelated severe traffic accidents, but CDT shows superior association with these events. Therefore, CDT, notwithstanding higher costs, should be preferred in a forensic/certification context.

CDT vs. GGT for the certification of the fitness to hold the driving license. A comparison based on the association of incremented values with the occurrence of alcohol-related road traffic accidents

Porpiglia, Nadia M
Writing – Original Draft Preparation
;
Bortolotti, Federica
Writing – Original Draft Preparation
;
Micciolo, Rocco
Methodology
;
Murari, Matilde
Methodology
;
Gibelli, Filippo
Methodology
;
Tagliaro, Franco
Writing – Review & Editing
2021-01-01

Abstract

Background: In the context of fitness certification to hold the driving license, GGT and CDT have been used, sometimes in combination (gamma-CDT), to exclude chronic alcohol abuse. The present study was carried out with the aim of comparing the power of these biomarkers as tools for the objective screening of subjects at high risk of alcohol-associated traffic injuries. Methods: 288 male drivers admitted to hospital after traffic accidents were examined by determination of GGT, CDT and BAC. The degree of association of GGT, CDT and gamma-CDT with BAC was analysed using non-parametric statistics. Results: Partitioning the cases using the cut-off concentrations of 0.5 g/L for BAC (the legal limit adopted in most European countries), 55 U/L for GGT and 1.9% for CDT, a highly significant difference was found between the frequency of elevated GGT or CDT in cases where BAC was within the legal limits and those with elevated BAC values (Fisher's exact test: p < 0.001). However, the calculation of the odds ratio showed a much higher increase for CDT (28 times) than for GGT (6 times) in those drivers with a BAC above the Italian legal limit in comparison with those showing a BAC within the cut-off; conversely, gamma-CDT does not provide any significant advantage vs. CDT alone. Conclusions: Both GGT and CDT provide objective evidence of an association with the occurrence of alcoholrelated severe traffic accidents, but CDT shows superior association with these events. Therefore, CDT, notwithstanding higher costs, should be preferred in a forensic/certification context.
2021
Alcohol abuse
CDT
Forensic toxicology
GGT
Road traffic accidents
File in questo prodotto:
File Dimensione Formato  
Porpiglia_GGT_CDT_DAD_2021.pdf

solo utenti autorizzati

Descrizione: Articolo principale
Tipologia: Documento in Post-print
Licenza: Accesso ristretto
Dimensione 692.21 kB
Formato Adobe PDF
692.21 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11562/1064036
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 2
social impact