Hello 'netters: We're wondering if there's a reference lab out there that does immunohistochemistry testing on cytology preparations. Have a good weekend all! Linda Sebree, HT(ASCP) University of Wisconsin Hospital & Clinics IHC/ISH Laboratory A4/204-3224 600 Highland Ave. Madison, WI 53792 (608)265-6596 FAX: (608)262-7174