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Clinical and Diagnostic Laboratory Immunology, January 2002, p. 187-189, Vol. 9, No. 1
1071-412X/01/$04.00+0 DOI: 10.1128/CDLI.9.1.187-189.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Department of Pathology, The University of Michigan Medical School,1 Warde Medical Laboratory, Ann Arbor, Michigan2
Received 29 March 2001/ Returned for modification 11 June 2001/ Accepted 26 September 2001
Because a retrospective study detected 13 negative Western blots out of 38 single-use diagnostic system (SUDS)-positive cases over a 1-year period, we performed a prospective study to compare the performance of the SUDS test with that of enzyme immunoassay (EIA). Of 888 SUDS-tested sera, 875 (98.4%) were both SUDS and EIA negative and 5 (0.6%) were SUDS, EIA, and Western blot positive. The rate of SUDS-positive samples decreased from 3.16/month in the retrospective study to 1.33/month in the prospective study. The immunoassays had sensitivities and specificities of 100 and 99.7 (SUDS) and 100 and 99.4% (traditional EIA), respectively. In laboratories with experienced personnel, the SUDS test performs as well as the EIA as a screen for infection with the human immunodeficiency virus.
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