In cytology, the unprocessed cells retrieved from the patient and intended for examination. Cells may be retrieved spontaneously (e.g., the patient urinates in a cup), by instruments (such as colonoscope, bronchoscope, or cystoscope), by needles (e.g., fine needle aspirations or spinal taps) or by other collection devices such as spatulas for pap tests.
Specifically selected portion of any substance, material, organism (specifically tissue, blood, urine or faeces) or environmental medium assumed to be representative of the parent substance etc. at the time it is taken for the purpose of diagnosis, identification, study or demonstration. PAC, 1990
Material sent in for evaluation, biopsy (tissue) or cell suspensions (body fluids).