Correction

In the article "CSF Tests for AD," in the July 1999 issue of Neurology Alert, Ab42 throughout the article should have been Ab₄₂. In the second paragraph of the commentary section, the first two sentences should read as follows: The multicenter study by Hulstaert et al provides another citation in support of the association between high CSF tau, low CSF Ab₄₂ levels, and AD. However, this study does little to advance the clinical use of these markers for diagnostic purposes.

In CME question number 1, Ab42 should have been Ab₄₂ throughout. We regret any confusion this may have caused.