What Is Cytology?
Cytology is the study of cells. In a medical laboratory, cytology involves examining cells from body sites, fluids or screening samples to look for abnormal changes.
Cytology is part of cellular pathology, but it is different from histopathology. Histopathology examines tissue architecture. Cytology focuses on individual cells or groups of cells.
Cytology vs histopathology
| Cytology | Histopathology |
|---|---|
| Examines cells | Examines tissue |
| Uses smears, fluids, aspirates or cell preparations | Uses biopsies and surgical specimens |
| Focuses on cell appearance | Focuses on tissue structure and architecture |
| Can support screening or diagnostic pathways | Often used for tissue diagnosis |
| May be quicker for some sample types | Usually involves tissue processing and sectioning |
What samples are used in cytology?
| Sample type | Example use |
|---|---|
| Cervical sample | Cervical screening/cytology pathway |
| Body fluids | Pleural, ascitic, pericardial or cerebrospinal fluid cytology |
| Fine needle aspirate | Cell sample from a lump, lymph node or organ |
| Urine | Urinary tract cytology in selected contexts |
| Sputum or respiratory samples | Respiratory cytology in some pathways |
| Brushings/washings | Samples from procedures such as endoscopy or bronchoscopy |
What happens in a cytology laboratory?
- Sample reception and identity check.
- Sample preparation.
- Slide preparation or liquid-based processing.
- Staining.
- Quality check.
- Microscopic examination.
- Reporting or referral for reporting.
- Additional testing where appropriate.
Cervical cytology
Cervical cytology is one of the best-known examples of cytology. It is used in screening pathways to look for abnormal cells and related risk patterns. Modern cervical screening programmes may involve HPV testing and cytology depending on the pathway. Cytology does not work alone — it forms part of a structured screening system.
Body fluid cytology
Body fluid cytology examines cells in fluids such as pleural fluid, ascitic fluid or cerebrospinal fluid. It may help investigate infection, inflammation, malignancy or other conditions depending on the clinical question.
Fine needle aspiration cytology
Fine needle aspiration cytology, or FNAC, uses a thin needle to collect cells from a lump, lymph node or organ. The sample is prepared and examined to support diagnosis or further investigation.
What does a cytology biomedical scientist do?
A cytology biomedical scientist may receive and check samples, prepare slides, use liquid-based cytology systems, stain cell preparations, check sample adequacy, support screening workflows, maintain quality control, document errors or rejected samples, support additional tests and work with reporting staff and pathologists.
Summary
Cytology is the laboratory study of cells. It is used in screening and diagnostic pathways, including cervical cytology, body fluid cytology and fine needle aspiration cytology. It differs from histopathology because cytology focuses on cells, while histopathology focuses on tissue.
FAQ
What is cytology?
Cytology is the study of cells, especially cell samples examined in a medical laboratory.
Is cytology the same as histopathology?
No. Cytology examines cells; histopathology examines tissue.
What samples are used in cytology?
Samples may include cervical samples, body fluids, fine needle aspirates, urine, sputum, brushings or washings.
Does cytology diagnose cancer?
Cytology may support cancer investigation or screening, but results must be interpreted by qualified professionals and may need follow-up testing.
Why might cytology be used instead of biopsy?
Some cytology samples are less invasive or easier to collect, but biopsy may still be needed in certain cases.
This article is for general education only. Cytology results must be interpreted by qualified healthcare professionals.