Citation

Pichini S, Ventura M, Pujadas M, Ventura R, Pellegrini M, Zuccaro P, Pacifici R, de la Torre R. Forensic Sci. Int. 2004; 145(2-3): 109-115.

Affiliation

Istituto Superiore di Sanità, V.le Regina Elena 299, 00161 Rome, Italy. pichini@iss.it

Copyright

(Copyright © 2004, Elsevier Publishing)

DOI

10.1016/j.forsciint.2004.04.025

PMID

15451081

Abstract

The Istituto Superiore di Sanità of Rome, Italy, in cooperation with Institut Municipal d'Investigaciò Mèdica of Barcelona, Spain, set up an external quality control program (HAIRVEQ) to evaluate reliability in hair testing for drug abuse by laboratories from the Italian National Health Service. Samples included in the program were real hair samples from drugs consumers. Prior to sending, hair samples were reduced to powdered form, mixed to ensure homogeneity and tested with GC/MS by four Reference Laboratories. Up to now, four different exercises have been concluded and 23 laboratories participated. Samples containing high and low concentrations of opiates, cocaine and metabolites, low concentrations of MDMA and two blank samples, were included in the intercomparison exercises performed in the first year of HAIRVEQ activities. Results show an insufficient performance of participating laboratories. About 82% of laboratories reported incorrect results on a qualitative basis (false positive and false negative results) for some of the submitted samples. More than one-half of laboratories reported quantitative results (60%). On the basis of the calculated z scores, only between 35 and 55% of results reported should be considered as satisfying. Guidelines have to be provided by Italian authorities for method validation as well as set of recommended cut-off concentrations to orientate laboratories in their quality objectives when developing analytical methodologies as tools to improve reliability and consequently performance of hair analysis.

Language: en