<prompt> Best fixative for Pap smear:95 ethanol 5 ether10 formaldehyde80 isopropyl alcohol90 ether alcohol  <response>: ANS. AFixatives: Pap smear: 95 ethanol 5 ether Light microscopy: 10 formaldehyde Electric microscopy: 2 glutaraldehyde For liquid-based cytology: Methanol For bone marrow biopsy: Zenkers fluid For bone marrow aspirate: Hellys fluid Cell block: Bouins fluid Karyotyping fixatives: Carnoys fixative 3:1 methanol to glacial acetic acid Gastrointestinal biopsies: Bouins fluid. 