The short answer
A frozen section is tissue that is frozen and thinly cut so a pathologist can look at it quickly. NCI says frozen sections are prepared when an immediate answer is needed and can be done in about 15 to 20 minutes. Permanent sections give more detail. This page explains the difference and what to ask your care team.
NCI says frozen sections are prepared when an immediate answer about a tissue sample is needed.
NCI says a frozen section can be done in about 15 to 20 minutes.
NCI says fixed (permanent) sections give the maximum detail and can be saved for later study.
Ask your care team whether the final report matched the frozen section result.
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This page is for anyone whose pathology report mentions a "frozen section." It explains what it is and what to ask your care team.
A fast look when an answer is needed now
Sometimes a surgeon needs an answer before a procedure ends. NCI says "frozen sections are prepared when an immediate answer about a tissue sample is needed." The tissue is frozen and cut into thin slices. A pathologist, a doctor who studies tissue under a microscope, looks at it. NCI says this can be done "in about 15 to 20 minutes."
Frozen section versus permanent section
Tissue can also be prepared the standard way, called fixed or permanent sections. NCI says these "provide the maximum detail of the structures in a tissue sample, and they can be saved and analyzed in the future if needed."
That is why your report may list a frozen section result and a separate final result. Ask your care team whether they agreed.
When to expect the report
NCI says the pathologist usually sends the report "within 10 days after the biopsy or surgery is performed." NCI also notes that results "will often appear in the patient portal at the same time the doctor receives them."
Ask these before you leave
- Was a frozen section done, and what did it show?
- Did the final report agree with it?
- When will we go over the final report together?
Related pages
See How to Read a Cancer Pathology Report and Surgical Margins: What Positive, Close, and Clear Mean.
Sources
Common questions
What is a frozen section?
It is a fast way to prepare tissue so a pathologist can look at it under a microscope. NCI says it is used when an immediate answer is needed.
Is the frozen section result final?
NCI says fixed, or permanent, sections give the most detail. Ask your care team whether the final report agreed with the frozen section.
How long does the full report take?
NCI says the pathologist usually sends the report within 10 days after the biopsy or surgery.
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Sources last checked: 2026-10-02 what this meansLast updated: 2026-09-27Next planned review: 2027-09-27
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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