You will be asked to lie on your back. A pillow will be placed under your shoulders. The area will be cleaned. For an FNA, a tiny hollow needle will be passed into the nodule. A sample will be collected into the needle. For a CNB, your doctor will make a small cut in the skin. The needle will be passed through the cut and into the thyroid. A sample will be collected into the needle. The process may need to be repeated several times. Pressure will be applied over the area once samples are collected. A bandage will be applied.
An ultrasound may be used to help locate the area. A handheld device will be placed on your neck. It will show the doctor where the needle is. It will help to make sure the nodule and not normal tissue is sampled.
How Long Will It Take?
About 10 to 30 minutes
Will It Hurt?
The site may be sore for 1 to 2 days. Medicine can help to ease discomfort.
Some activity will need to be limited in first 1 to 2 days.
Call Your Doctor
Let the doctor know if recovery is not going as expected or you have problems such as:
Signs of infection, including fever and chills
Trouble breathing or swallowing
Excessive neck swelling
Unusual pain or discomfort
If you think you have an emergency, call for emergency medical services right away.
Ross DS. Fine needle aspiration biopsy of thyroid nodules/instructions for patients undergoing core needle biopsy. Thyroid Foundation of Canada website. Available at: http://www.thyroid.ca/e12b.php. Accessed January 8, 2020.
Thyroid nodules. American Thyroid Association website. Available at: https://www.thyroid.org/thyroid-nodules. Accessed January 8, 2020.
Thyroid nodules. New York Thyroid Center website. Available at: http://columbiasurgery.org/conditions-and-treatments/thyroid-nodules. Accessed January 8, 2020.
Ultrasound-guided fine needle aspiration biopsy of the thyroid. Radiology Info—Radiological Society of North America Radiology website. Available at: https://www.radiologyinfo.org/en/info.cfm?pg=thyroidbiopsy. Updated March 30, 2018. Accessed January 8, 2020.
Last reviewed September 2019 by
EBSCO Medical Review Board Nicole Meregian, PA
Last Updated: 10/2/2020
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