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Purpose of a biopsy

A biopsy is a procedure that allows doctors to remove a small piece of tissue from the body and look at it closely. One of the first steps in treatment is the diagnosis. Diagnosis of many diseases includes a biopsy. A pathologist looks at this tissue under a microscope. The pathologist looks at the cells to see if they are different from healthy cells. This is called the histology of the tissue. The way the cells look gives information about the specific type and stage of the disease.


Most patients do not meet their pathologists, but these doctors play an important role in diagnosis and treatment.

How a biopsy is done

The way a biopsy is done depends on where the tissue is located, the amount of tissue needed, and other procedures that are planned. Types of biopsies include needle biopsy and surgical biopsy.

  • Needle biopsy: A needle is used to take tissue or fluid from muscles, bones, or other organs. During a needle biopsy, your provider may use CT, MRI, or ultrasound imaging to help see the tissue and needle position. Some needle biopsies only numb the area where the biopsy is taken. Others may require sedation.
  • Surgical biopsy: In a surgical biopsy, your provider may have to cut into the skin to take a biopsy. This is often due to the location of the tissue. The provider will use MRI, CT, or other imaging scans to help find the tissue. Sometimes, the provider uses a tiny video camera to see inside the body.

Some biopsies need only small cuts. Other biopsies need large cuts. In certain cases, doctors may remove the diseased tissue at the same time as the biopsy. Your provider may look at nearby lymph nodes and other tissues to see if the disease has spread.

After biopsy care

Usually, a biopsy is not painful. But the care team may give your child medicine to reduce any pain or discomfort. After the procedure, follow your care team’s instructions about how to manage soreness or pain. They will also tell you how to care for the biopsy site to prevent infection.

How a biopsy is used to diagnose disease

A pathologist uses a microscope to look at cells from a biopsy. The diagnosis is based on what the cells look like, how fast they are likely to grow, and how much the cells have spread. The diagnosis tells the stage and grade of the disease or cancer. This information is in the pathology report.

  • Stage refers to where the disease or cancer is in the body. This includes where it started and where it has spread.
  • Grade describes how different cells look from healthy cells, how fast the cells grow, and how likely they are to spread.

Your health care team will use details from the biopsy to plan treatment. They also consider:

  • Type of cancer or disease
  • Size of the tumor
  • Whether cancer cells have spread to lymph nodes or other areas of the body

Learn more about cancer diagnosis and treatment.

Exam under anesthesia

In some cases, doctors may use sedation to examine a person or do a biopsy. This procedure is called an EUA: exam under anesthesia. Because providers must watch patients during anesthesia, they do EUAs in an operating room with an anesthesiologist.

In childhood cancer or disease, an EUA is usually used to diagnose retinoblastoma, a cancer of the eye. Sometimes, providers do EUAs for other exams such as pelvic exams.

Doctors try to limit the use of anesthesia when possible. But some exams require the child to be completely still. The type of exam, child’s age, and potential physical or emotional discomfort may call for the use of sedation.

Biopsy results

Talk to your health care team about when and how you will get results.

Risks of a biopsy

Your health care team tries to make sure your child’s biopsy does not cause any complications. Biopsy risks include bleeding, infection at the biopsy site, and scarring. There may be other risks depending on the organ biopsied. Discuss this with your health care team.

To prevent infection at the site, follow your team’s instructions for care after your child’s biopsy. Contact your care team if you notice that your child has any signs of infection, including:

  • Fever or chills
  • Continued bleeding at the biopsy site
  • Redness, swelling, oozing, or a bad smell at the biopsy site

Key Points

  • A biopsy is when a small amount of tissue is taken and looked at under a microscope. It is an important step in diagnosis of many diseases.
  • The type of biopsy depends on the location of the tissue. Whether your child needs sedation for the biopsy depends on the location of the tissue.
  • By looking at the tissue, your care team diagnoses and creates a treatment plan for your child’s condition. Talk to your health care team about when and how you will get results.

Reviewed: August 2022