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Journal of Clinical Microbiology, September 2005, p. 4830-4833, Vol. 43, No. 9
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.9.4830-4833.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Comparative Evaluation of Three Commercial Systems for Nucleic Acid Extraction from Urine Specimens

Yi-Wei Tang,1,2* Susan E. Sefers,2 Haijing Li,1 Debra J. Kohn,3 and Gary W. Procop3

Departments of Medicine,1 Pathology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232,2 Section of Clinical Microbiology, The Cleveland Clinic Foundation, Cleveland, Ohio 441953

Received 14 March 2005/ Returned for modification 12 April 2005/ Accepted 20 June 2005

A nucleic acid extraction system that can handle small numbers of specimens with a short test turnaround time and short hands-on time is desirable for emergent testing. We performed a comparative validation on three systems: the MagNA Pure compact system (Compact), the NucliSens miniMAG extraction instrument (miniMAG), and the BioRobot EZ1 system (EZ1). A total of 75 urine specimens submitted for polyomavirus BK virus detection were used. The human ß-actin gene was detected on 75 (100%), 75 (100%), and 72 (96%) nucleic acid extracts prepared by the miniMAG, EZ1, and Compact, respectively. The miniMAG produced the highest quantity of nucleic acids and the best precision among the three systems. The agreement rate was 100% for BKV detection on nucleic acid extracts prepared by the three extraction systems. When a full panel of specimens was run, the hands-on time and test turnaround time were 105.7 and 121.1 min for miniMAG, 6.1 and 22.6 min for EZ1, and 7.4 and 33.7 min for Compact, respectively. The EZ1 and Compact systems processed automatic nucleic acid extraction properly, providing a good solution to the need for sporadic but emergent specimen detection. The miniMAG yielded the highest quantity of nucleic acids, suggesting that this system would be the best for specimens containing a low number of microorganisms of interest.

* Corresponding author. Mailing address: Molecular Infectious Diseases Laboratory, 4605 TVC, Vanderbilt University Hospital, TN 37232-5310. Phone: (615) 322-2035. Fax: (615) 343-8420. E-mail: yiwei.tang{at}vanderbilt.edu.

Journal of Clinical Microbiology, September 2005, p. 4830-4833, Vol. 43, No. 9
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.9.4830-4833.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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