Fine Needle Aspiration Biopsy (FNA)

Fine needle aspiration uses a thin needle, finer than a blood test needle, to draw cells out of a lump so a pathologist can examine them under the microscope. It is the usual first test for thyroid nodules, enlarged lymph nodes, salivary gland lumps and some breast lumps.

It answers quickly whether a lump looks benign, suspicious or malignant. Because it collects loose cells and not a solid piece of tissue, it sometimes cannot give a definite answer.

What Fine Needle Aspiration Biopsy (FNA) shows

The pathologist looks at the shape and arrangement of individual cells. In the thyroid, results are reported with the Bethesda system in six categories from non-diagnostic to malignant, each with an estimated cancer risk and a recommended next step. In lymph nodes, FNA can show infection, reactive change or spread from a cancer elsewhere, although lymphoma usually needs a core or whole node biopsy for typing. Molecular tests can be run on the sample for indeterminate thyroid nodules, where available.

When Fine Needle Aspiration Biopsy (FNA) is recommended

• Thyroid nodules that meet size and ultrasound criteria for sampling
• A neck lump lasting more than 3 weeks
• Enlarged lymph nodes in someone with known or suspected cancer
• Salivary gland swellings
• Cysts that can be drained and tested at once

Limits and situations where another test is better:

• Suspected lymphoma, where a core or excision biopsy is more useful
• Breast lumps, for which core biopsy is now generally preferred because it shows tissue structure
• Very small or purely cystic thyroid nodules with benign ultrasound features, which usually need no sampling
• About 1 in 10 thyroid samples is non-diagnostic and must be repeated

How to prepare

• No fasting needed
• Tell the doctor about blood thinners; aspirin can usually continue, others may be paused on advice
• Bring previous ultrasound reports and images
• Avoid neck jewellery and wear an open collar

What happens during the test

You lie down with the neck slightly extended. The skin is cleaned and sometimes numbed. Under ultrasound guidance the doctor passes the needle into the lump and moves it gently for a few seconds; two to four passes are typical. You should not swallow or talk during each pass. It feels like pressure with a brief sting. The procedure takes 10 to 20 minutes and you go home after a few minutes of pressure on the site.

Results and next steps

If a cytologist checks the slides on site you may hear the same day whether the sample is adequate. The formal report takes 2 to 5 working days, longer with molecular testing. Benign results lead to ultrasound follow-up; indeterminate results to a repeat FNA, molecular testing or diagnostic surgery; malignant results to surgical planning.

• Test time: 10 to 20 minutes
• Results ready: 2 to 5 working days
• Back to everyday activity: None

Safety and risks

• Small bruise or tenderness for a day or two
• Bleeding into the neck, rare and mostly in people on anticoagulants
• Infection, which is very uncommon
• A non-diagnostic or indeterminate result requiring another procedure
• Fainting from needle anxiety

Arranging Fine Needle Aspiration Biopsy (FNA) in Türkiye

FNA makes sense as part of a thyroid or head and neck work-up during a visit, particularly if you may go on to surgery in the same place. Allow about a week for the report before decisions are made, or arrange for results to be discussed by video.

Send your previous reports and the question you want answered and a Clinic-Y coordinator replies within 24 hours with suitable teams and written, all-inclusive proposals side by side. Reviewing your case is free.

Frequently Asked Questions