Understanding your histology report

What endoscopy shows and what a biopsy adds

The endoscopy report records what was seen, which areas were examined and what was sampled or removed. Histology looks more closely at the tissue sent to the laboratory. A pathologist, a doctor trained to examine cells and tissue, writes the laboratory report.

These two reports can add different information. A normal-looking bowel can still have microscopic inflammation, such as microscopic colitis. Equally, an area that looks irritated does not by itself mean cancer. Taking a biopsy is a routine way to check many conditions.

A concerning lesion is often visible during endoscopy, and a biopsy can confirm its diagnosis. Some important changes are only visible under the microscope, so the final interpretation waits for the tissue result.

Check where the sample was taken and the diagnosis

Check that the report has your details and the correct procedure date. Samples are listed by where they came from, for example stomach, duodenum (the first part of the small bowel) or a particular part of the colon. The same wording can have different implications in different organs.

A report may include a description of the tissue as received, a microscopic description and a final diagnosis or summary. The final diagnosis usually gives the clearest starting point. The number of tissue fragments is not necessarily the number of polyps removed. One polyp may have been retrieved in several pieces.

What do the common terms mean?

What a normal biopsy can and cannot tell us

A result such as no significant abnormality is reassuring about the tissue examined. It does not mean every part of your digestive tract has been tested, or that every cause of your symptoms has been excluded. Some conditions are patchy, and some do not cause changes that a routine biopsy can identify.

I check that the sample came from the area I intended to test. If the camera showed an abnormal area but the biopsy did not explain it, I consider whether another sample or test is needed. A biopsy from a large area may not represent every part of it.

After flexible sigmoidoscopy, interpret biopsies alongside the area examined and any continuing symptoms. →

Does the report prove a polyp was completely removed?

A biopsy takes a sample. It does not always remove the whole abnormal area. A removed polyp can sometimes be assessed at its margins, the edges of the tissue. A clear margin is reassuring about the edge that could be examined. An involved margin means abnormal tissue reaches an edge.

If a polyp was removed in pieces, the laboratory cannot reliably reconstruct all its margins. This does not by itself mean tissue was left behind. I also use the endoscopy findings and removal technique to decide whether the removal site needs an earlier check. Routine small lining biopsies are not designed to assess complete removal.

How I recommend follow-up

Surveillance is a planned examination to look for new changes, sometimes when you have no symptoms. After bowel polyps, I consider their type, number and size, whether they were fully removed, how well the bowel was prepared and your history.

Your recommended treatment and follow-up will be documented in your endoscopy report and/or histology report once the tissue results are available.

Sometimes I may recommend a short-interval colonoscopy to check that a higher-risk polyp removal site is clear of residual or recurrent tissue. This has a different purpose from longer-term surveillance of the rest of the bowel.

When will I receive my result?

Routine biopsies often take a few weeks to be reported. Urgent samples taken for a suspected serious problem are usually reported sooner. Extra stains or a second specialist opinion can take longer; a delay alone does not mean the result is serious.

Our team will explain how your results will be communicated. Please get in touch with me if an expected result has not arrived or you are unsure who is arranging the next step.

I may request a separate appointment to discuss unexpected findings. You are also welcome to arrange a follow-up consultation to talk through your results or ongoing symptoms. Insurance often covers these consultations, depending on your policy and any approval requirements.

Related information

• Why were biopsies taken?
• Bowel polyps and removal
• About gastroscopy
• About colonoscopy
• Follow-up after bowel polyp removal
• Barrett's oesophagus
• Looking at the small bowel: capsule cameras, scans and enteroscopy
• Understanding inflammatory bowel disease (IBD)
• Gastritis and reactive gastropathy
• Microscopic colitis: when the camera looks normal