Cell-blocks and other ancillary studies (including molecular genetic tests and proteomics).

Many types of elective ancillary tests may be required to support the cytopathologic interpretations. Most of these tests can be performed on cell-blocks of different cytology specimens. The cell-block sections can be used for almost any special stains including various and for including fungi, Pneumocystis jirovecii (carinii), and various organisms including acid-fast organisms similar to the surgical biopsy specimens. Similarly, in addition to , different can be performed on cell-blocks. Molecular tests broadly can be divided into two main types and .