Intraoperative Consultation: What It Means When a Pathologist Examines Tissue During Your Surgery

Section Editor: Jason Wasserman MD PhD FRCPC
November 9, 2026

An intraoperative consultation is a quick examination of tissue by a pathologist while you are still in the operating room. During the operation, the surgeon sends the tissue to the lab, and the pathologist provides an answer within minutes. The surgeon then uses that answer to decide how to finish the operation. The most common method is a frozen section, in which the tissue is frozen so it can be cut and examined right away.

This article explains why intraoperative consultations are done, how they work, and how they appear in your pathology report. It also explains why the answer given during surgery can occasionally differ from the final diagnosis.

What is an intraoperative consultation?

An intraoperative consultation is a conversation between your surgeon and a pathologist that happens during your operation. The surgeon has a question that needs an answer before the operation ends, and the pathologist answers it by examining tissue right away. Most of the time, you will not know it happened until you read your pathology report.

The answer given during surgery is preliminary. It is based on a fast method that is less detailed than the routine processing used for the final diagnosis. The same tissue is processed in the usual way afterward, and the final pathology report gives the complete diagnosis.

Why would a surgeon ask for an intraoperative consultation?

A surgeon asks for an intraoperative consultation when the answer will change what happens during the same operation. If the answer would not change anything until after surgery, the pathologist usually waits for the final diagnosis instead. The most common reasons are:

Making a diagnosis. The surgeon needs to know what a mass is, because the answer decides how much tissue to remove. A mass in the ovary that turns out to be cancer, for example, may lead to a larger operation to stage the cancer. This is the most common reason, making up about half of requests.
Checking the margins. The surgeon needs to know whether cancer reaches the cut edge of the tissue. If it does, the surgeon can remove more tissue during the same operation. Our article on surgical margins explains what margins are and why they matter.
Confirming the sample is adequate. The surgeon wants to ensure the biopsy contains abnormal tissue before closing. This avoids a second procedure if the sample is non-diagnostic.
Identifying a type of tissue. During thyroid or parathyroid surgery, for example, the surgeon may want to confirm that a small tissue sample is a parathyroid gland.
Directing the tissue to the right tests. Some tests, such as flow cytometry for a suspected lymphoma, need fresh tissue. The pathologist sends the tissue to the right place before preservation

How is an intraoperative consultation done?

An intraoperative consultation starts when the surgeon sends tissue directly to the pathology laboratory, usually labeled as urgent. A pathologist examines the tissue with the naked eye first and chooses the area most likely to answer the surgeon’s question.

Frozen section. A small piece of tissue is frozen solid and cut into a thin slice with a machine called a cryostat. The slice is stained and examined under the microscope. The College of American Pathologists expects 90% of simple frozen sections to be completed within 20 minutes.
Touch or smear preparation. Cells are pressed or smeared onto a glass slide and stained. This method is fast and is often used alongside a frozen section.
Gross examination only. Sometimes the answer is clear from looking at the tissue, such as measuring how far a tumor is from the cut edge. No slide is needed.

The pathologist then calls the operating room or speaks directly to the surgeon. The surgeon repeats the answer to confirm they heard it correctly, and the conversation is recorded in your report.

How does an intraoperative consultation appear in my pathology report?

The intraoperative consultation usually has its own section in your pathology report, often near the top or just before the final diagnosis. It may be labeled “intraoperative consultation,” “frozen section diagnosis,” or “intraoperative diagnosis.” Here is an example of how it may look:

INTRAOPERATIVE CONSULTATION:
A. OVARY, LEFT, FROZEN SECTION:
– MALIGNANT EPITHELIAL NEOPLASM. FINAL CLASSIFICATION DEFERRED TO PERMANENT SECTIONS.
B. PERITONEUM, NODULE, FROZEN SECTION:
– POSITIVE FOR CARCINOMA.
Results called to Dr. Patel in the operating room at 10:42 and read back.

Each line gives the specimen, the method, and the answer, followed by a record of who was told and when. Later in the report, the pathologist often comments on whether the final diagnosis agrees with the answer given during surgery. A line such as “frozen section diagnosis confirmed on permanent sections” means the two agree.

Our section-by-section guide to the pathology report shows where this section sits among the other parts.

What does “deferred” mean?

“Deferred” means the pathologist chose not to give a final answer during surgery and will give it once the routine slides are ready. The full phrase is often “deferred to permanent sections.” It is a careful decision, not a failure.

A pathologist defers when the frozen section cannot safely answer the question. The tissue may be difficult to interpret after freezing, or the answer may need tests that take longer. Giving a wrong answer during surgery could lead to an unnecessary or inadequate operation, so waiting is the safer choice.

A deferral can be partial. In the example above, the pathologist confirmed that the ovarian mass was cancer, which is what the surgeon needed to know. The exact type of cancer was deferred, because it does not change the operation and is better decided on the routine slides.

Can the final diagnosis be different from the frozen section?

The final diagnosis can occasionally be different from the answer given during surgery. Frozen sections are fast, but the freezing process distorts cells, and only part of the tissue can be examined in the time available. The final diagnosis is made later on fully processed tissue, often with additional stains.

Differences are uncommon. In one study of more than 3,600 frozen sections, about 3% differed from the final diagnosis, and another 3% were deferred. Many differences are minor and do not change care. When a difference matters, the pathologist contacts your surgeon, and your care team explains what it means.

The final diagnosis always counts. If your report shows a different answer during surgery, your care team will use the final diagnosis.

Which tissues are hard to examine by frozen section?

Some tissues are difficult or impossible to examine by frozen section so that the pathologist may decline or defer the request. This deliberate choice protects the accuracy of your final diagnosis.

Fatty tissue. Fat does not freeze firmly enough to cut a good slice. This limits frozen sections of some breast tissue and other fatty specimens.
Bone and calcified tissue. Hard tissue cannot be cut with a cryostat. Frozen section is usually not used to diagnose bone tumors.
Some thyroid nodules. Telling a benign follicular nodule from a cancer requires examining the entire outer capsule, which a frozen section cannot do. Freezing can also make the later examination more difficult.
Very small samples. When there is only a little tissue, freezing it could use up the material needed for the final diagnosis.

Looking up a word in your report?

Our Pathology Dictionary explains individual terms you may see in this part of your report, such as “frozen section,” “margin,” and “negative for malignancy.”

How is Mohs surgery different?

Mohs surgery is a type of skin cancer surgery that also uses frozen sections during the operation, but it works differently from a standard intraoperative consultation. In Mohs surgery, the surgeon removes the tissue and personally examines the frozen slides, without sending them to a pathologist.

The Mohs surgeon examines the entire edge and base of each piece of tissue removed. If the surgeon finds cancer at the edge, they mark its location on a map and remove more tissue from that spot. The process repeats until no cancer remains.

Is the “intraoperative findings” section of my operative report the same thing?

The “intraoperative findings” section of an operative report is not the same as an intraoperative consultation. Your surgeon writes the operative report and describes what they saw and did during the operation. For example, it may say the ovaries looked normal or that there were adhesions.

A pathologist writes an intraoperative consultation, and it appears in your pathology report. If your operative report mentions a frozen section, the result will also appear in your pathology report, along with the final diagnosis.

What happens after the operation?

After the operation, the lab processes all tissue, including the piece used for the frozen section, in the usual way. The pathologist examines the routine slides, orders any additional tests, and writes the final report. This usually takes several days, and longer when special tests are needed.

Your surgeon may tell you the answer from the intraoperative consultation soon after you wake up. Remember, this is a preliminary answer. Your care team will plan the next steps based on the final pathology report.

Find your final diagnosis in our Diagnosis Library

Once your final report is ready, look up the diagnosis in our Diagnosis Library. Each article explains that diagnosis and walks through the pathology report written for it.

Questions to ask your doctor

Was an intraoperative consultation or frozen section done during my surgery?
What question was the frozen section meant to answer?
Did the frozen section result change what was done during the operation?
Were any parts of the frozen section deferred to permanent sections?
Does my final diagnosis agree with the frozen section result?
If the final diagnosis is different, what does that mean for my care?
Were the margins checked during surgery, and were they negative?
Is my final pathology report ready, or are more results expected?