Karen,
I have not used the Surgipath product, so I can't really comment.
Hopefully Surgipath could answer this.

Regards, Tony
.
Tony Henwood
Senior Scientist
Anatomical Pathology
Royal Prince Alfred Hospital
Sydney, AUSTRALIA

http://www2.one.net.au/~henwood
http://www.pathsearch.com/homepages/TonyHenwood/default.html