ASCP CT key terms

A standardized reporting framework for cervical and vaginal cytology that requires a specimen adequacy statement, a general categorization, and a specific interpretation so clinicians receive consistent, management-oriented results.

The judgment of whether a cervical cytology slide contains enough well-visualized squamous cells, and when relevant endocervical or transformation-zone material, to be interpreted reliably; reported as satisfactory or unsatisfactory.

The area of the cervix where columnar endocervical epithelium has been replaced by squamous epithelium through metaplasia; most cervical squamous neoplasia arises here, so sampling it improves test sensitivity.

A squamous epithelial cell with an enlarged, wrinkled, hyperchromatic nucleus surrounded by a perinuclear clear halo and dense cytoplasm, the classic cytopathic feature of productive human papillomavirus infection.

A Bethesda interpretation for squamous cells showing changes suggestive of, but not sufficient for, a low-grade lesion; it is the most common abnormal cervical result and is usually triaged with HPV testing.

A Bethesda category encompassing mild squamous dysplasia (CIN 1) and human papillomavirus cytopathic effect, with nuclei enlarged relative to cell size and often irregular in outline.

A Bethesda category for moderate to severe squamous abnormality (CIN 2 or 3) showing markedly increased nuclear-to-cytoplasmic ratios and irregular nuclear membranes, generally managed with colposcopy and excision.

A Bethesda interpretation used when squamous cells raise concern for a high-grade lesion but the abnormality is too limited or equivocal for a definitive HSIL diagnosis; typically evaluated with colposcopy regardless of HPV status.

A Bethesda category for glandular cells that are atypical but not clearly neoplastic, subdivided by probable origin (endocervical, endometrial, or not otherwise specified) and requiring evaluation for cervical and endometrial disease.

A collection method in which the cervical sample is rinsed into preservative fluid and a thin monolayer of cells is prepared on a slide, reducing obscuring blood and mucus and allowing reflex molecular testing.

Molecular detection of carcinogenic human papillomavirus types, notably 16 and 18, used to triage equivocal cytology, co-test with cytology, or follow abnormal results; a negative result has strong negative predictive value.

Mesothelial cells that enlarge, cluster, and develop prominent nucleoli in response to fluid or inflammation; separating them from adenocarcinoma cells is a core challenge in effusion cytology.

A concentrically laminated, basophilic calcification seen in some papillary carcinomas of thyroid and ovary as well as in benign conditions; its presence alone does not establish malignancy.

An asbestos fiber coated with iron and protein, appearing in sputum or bronchoalveolar lavage as a beaded, dumbbell-shaped golden structure; it documents asbestos exposure but not necessarily asbestos-related disease.

Yeasts, pseudohyphae, or hyphae identified in respiratory, urine, or vaginal specimens; organism morphology such as budding yeasts, septate hyphae, or a capsule, combined with clinical context, separates colonization from true infection.

A Paris System urine cytology diagnosis requiring markedly increased nuclear-to-cytoplasmic ratio, hyperchromasia, and irregular nuclear membranes; it carries a high risk of invasive cancer and prompts cystoscopy.

Examination of cerebrospinal fluid for cellular content; normal fluid is sparsely cellular with lymphocytes and monocytes, whereas blasts, malignant cells, or marked eosinophilia suggest leptomeningeal or other disease.

Sampling of a mass with a thin needle, usually 22 to 27 gauge, yielding individual cells and small clusters for smears and cell blocks without preserving overall tissue architecture.

Immediate microscopic assessment of an aspirate smear during the procedure to confirm the sample is adequate and diagnostic, allowing the aspirator to repeat or redirect the pass before the patient leaves.

A preparation in which aspirated material or fluid is centrifuged and embedded in paraffin so that sections, special stains, and immunocytochemistry can be performed on the same specimen.

A six-category reporting scheme for thyroid fine needle aspiration, from nondiagnostic to malignant, that assigns each category an implied risk of malignancy and a recommended management strategy.

Atypia of undetermined significance or follicular lesion of undetermined significance: the indeterminate thyroid Bethesda category applied when nuclear or architectural atypia is present but insufficient for a definitive diagnosis.

Diagnostic cytologic findings including enlarged overlapping nuclei with fine pale chromatin, nuclear grooves, and intranuclear pseudoinclusions, often accompanied by papillary clusters and psammoma bodies.

A pattern in aspirate smears showing epithelioid histiocytes with caseous necrosis, raising concern for tuberculosis or another granulomatous infection and usually prompting culture and molecular testing.

A benign salivary gland tumor whose aspirate shows uniform epithelial and myoepithelial cells within a fibrillary, chondromyxoid stroma; the stroma is the key feature distinguishing it from other salivary neoplasms.

Federal legislation regulating laboratory testing in the United States by setting requirements for personnel qualifications, quality control, proficiency testing, and inspection according to test complexity.

A voluntary, peer-based laboratory accreditation program built on published checklists and periodic on-site inspections; cytology laboratories often hold it in addition to required CLIA certification.

Predefined conditions such as missing or mismatched patient identifiers, unlabeled containers, or improper fixative that require a laboratory to refuse the specimen rather than report an unreliable result.

A regulatory cap on how many cytology slides a technologist may screen within twenty-four hours and per hour, intended to limit fatigue-related interpretive errors.

Mandatory external testing in which a laboratory interprets unknown slides or specimens and its results are compared with peer laboratories and validated, demonstrating ongoing interpretive competence.

The day-to-day technical and interpretive checks, such as stain quality monitoring, control slides, and instrument verification, that detect and correct errors inside the testing process itself.

The broader program that monitors outcomes across the entire testing pathway, including audits, correlation studies, and corrective actions, to confirm the system consistently produces accurate results.

Re-examination of a randomly selected portion of negative cervical cytology slides by a qualified supervisor or pathologist, a required check designed to detect false-negative screening errors.

A required retrospective review of prior negative cervical cytology and histology for a patient with a newly diagnosed HSIL or cancer, performed to find missed abnormalities and system failures.

Comparison of cytology interpretations with subsequent biopsy or resection diagnoses; discordant pairs are reviewed to identify sampling or interpretive errors and to trigger corrective action.

An approach that treats all blood, body fluids, and unfixed specimens as potentially infectious, requiring gloves and other barriers based on anticipated exposure rather than on a known diagnosis.

The OSHA regulation requiring an exposure control plan, an offered hepatitis B vaccination, engineering controls, and training for workers who may contact blood or other potentially infectious material.

A standardized document supplied with each hazardous chemical that lists its hazards, handling and storage requirements, spill response, and first-aid measures; formerly called a material safety data sheet.

A ventilated work enclosure, typically Class II, that uses inward airflow and HEPA filtration to protect both the operator and the specimen when handling infectious material or volatile chemicals.

Placing needles, blades, and broken glass into rigid, puncture-resistant, labeled containers at the point of use to prevent needlestick injuries and occupational infection.