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What is histopathology?
Histopathology examines tissue under a microscope. A pathologist is a doctor trained to interpret the pattern of cells, their structure and additional laboratory findings. Cytology examines individual cells or small cell groups, for example from a needle aspiration or fluid sample.
The pathology result is read alongside your symptoms, examination and scans. A report is not simply a yes-or-no cancer test: it may identify a benign condition, infection, inflammation, a precancerous change or a particular cancer. Some samples remain uncertain until further testing or review is complete.
What happens after the biopsy?
The sample is labelled and sent to the laboratory with clinical information. Tissue is usually preserved, processed and embedded in a wax block. Very thin sections are placed on slides and stained so the cells can be assessed. Some investigations require fresh tissue or different handling, so the clinical and laboratory teams plan this when necessary.
The first microscopic assessment may suggest a diagnosis but leave questions about the cell of origin or subtype. Additional stains, tests or an expert opinion may then be requested. A supplementary report may follow the initial report; keep these documents together.
Immunohistochemistry and other tests
Immunohistochemistry, often called IHC, uses antibodies to show particular proteins in cells. A panel of stains can help distinguish between cancers that look similar, suggest where a tumour started or identify treatment-relevant features. A single positive stain rarely tells the whole story.
For example, breast tissue may be assessed for hormone receptors and HER2 where relevant. Some results need a further test to clarify them. Depending on the suspected diagnosis, the laboratory may also use tests such as flow cytometry, chromosome studies or molecular analysis. Not every sample needs every investigation.
Understanding molecular and genetic testsReading the main parts of your diagnostic report
- Sample and site: identifies what was received and where it was taken from. Check that these match your procedure.
- Diagnosis and tumour type: describes what the cells represent. Terms such as carcinoma, lymphoma and melanoma refer to different disease groups with different treatment approaches.
- Grade or differentiation: may describe how abnormal the cells look or indicate biological behaviour. The grading system depends on the cancer; not all cancers use the same scale.
- Additional tests: records relevant stains and biomarkers, sometimes with results still pending.
- Comments and limitations: may explain uncertainty, a small sample or a recommendation for another test.
Grade is different from stage
Grade describes features of the tumour cells. Stage describes the extent of the cancer in the body. A biopsy may establish type and grade but often cannot determine the complete stage. Your team combines the pathology with imaging and other findings.
A high-grade result does not automatically mean the cancer has spread. Likewise, a small-looking abnormality cannot be assumed to be early-stage without the appropriate assessment. Ask your doctor to explain the two terms separately for your diagnosis.
What if the result is negative, uncertain or unexpected?
“No malignancy identified” describes what was seen in the submitted sample. Whether it reliably excludes cancer depends on how well the sample represents the abnormality and whether the result fits the other findings. A suspicious scan and a reassuring biopsy may need discussion, further review or another sample.
Small samples, damaged tissue, treatment effects or overlapping appearances can make interpretation difficult. An uncertain report is a reason to clarify the next step, not to draw your own conclusion from an isolated phrase.
Specialist review and transferring slides or blocks
A second pathology review can be useful for an unusual diagnosis, disagreement between findings or a major treatment decision. This may involve reviewing existing slides and, if needed, the tissue block; it does not automatically require another biopsy.
Ask the original laboratory how to arrange release or transfer. Bring the original report, supplementary reports and relevant clinical records. Tissue is a finite resource, so coordination between laboratories helps avoid unnecessary repeat testing and preserves material for essential investigations.
Why results can take time
Tissue processing, additional stains, molecular tests and specialist review have different turnaround times. A longer wait does not by itself mean the result is worse. Ask whether the expected date is for the initial report or the completed report, and who will contact you.
At your review, ask: What is confirmed? What is still uncertain? Are further tests pending? Is there enough information to plan treatment? Keep a copy of the final diagnosis and all later additions.
Continue exploring
Arranging investigations through CTI
Contact CTI to coordinate the appropriate investigation with the hospital team. Confirm the procedure, preparation and location before travelling; specialised tests may involve another department or a referral laboratory.
