Source: Annual Congress 2013 –Diagnosis and management of respiratory diseases
Disease area: Airway diseases

Abstract

Background: Alpha₁-antitrypsin (AAT) deficiency (AATD) is a largely underdiagnosed genetic disorder. Reduced serum levels of AAT lead to a higher risk of developing emphysema and chronic liver disease at an early age. Several strategies are currently being proposed to improve detection rates.
Aims: Little attention has previously been paid to subjects with a reduced alpha-1 globulin (A1G) electrophoresis band. We therefore investigated the potential of routine serum protein electrophoresis (RSPEP) to improve AATD detection rates based on this marker.
Methods: The RSPEP pilot study included 214,894 electrophoresis samples. Nephelometric measurement of AAT was performed and a number of subjects were referred for verification of AATD diagnosis. Data were compared with results from the Italian AATD targeted detection program.
Results: In the 16-year period (1996-2012) the program obtained 3595 samples. Patients with severe AATD, who were tested because of a reduced A1G band, comprised 0.75% of the total sample. In the RSPEP pilot study, 601 samples showed A1G to be < 2.8% of the total protein content. Nephelometric assay data are reported in Table 1. Among subjects with low plasma AAT concentration, 21 were referred for further testing and 8 were found to have severe AATD (1.33% of the sample with reduced A1G content).
Conclusions: The RSPEP strategy combines detection of reduced A1G levels and nephelometric AAT measurement. By applying an appropriate AAT level cutoff, this technique allows the identification of asymptomatic AATD subjects and increases AATD detection rates at a low cost.

AAT (g/L)	n°	%
≤ 0.5	21	0.01
> 0.5 ≤ 1	294	0.1
> 1 ≤ 1.13	61	0.03
≥ 1.13	225	0.1

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S. Ottaviani, M. Trevisan, I. Ferrarotti, M. Gorrini, R. Baldo, L. Quargentan, M. Luisetti (Pavia, San Bonifacio (VR), Italy). Routine serum protein electrophoresis and detection of alpha₁-antitrypsin deficiency. Eur Respir J 2013; 42: Suppl. 57, 4173

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