Fine Needle Aspiration Cytology of Thyroid (FNA Cytology)

Why Is This Test Done?

Your doctor may recommend this test if you have a thyroid lump or nodule detected on imaging tests (like an ultrasound). It can also be used to evaluate symptoms such as unexplained weight changes, goiter (enlarged thyroid), or persistent neck pain. This test helps determine whether the nodule is benign, suspicious, or cancerous.

What Happens During the Procedure?

You’ll lie down comfortably while a doctor inserts a thin needle into your thyroid through your neck. A small amount of fluid or cells is collected. The procedure usually takes a few minutes and is often done in a doctor’s office. You may feel slight discomfort, but it’s generally well-tolerated. No anesthesia is typically needed.

What to Expect After the Test

After the procedure, you may have mild bruising or soreness at the site, which usually goes away within a few days. Avoid strenuous activity for 24 hours. Your results will be reviewed by a pathologist, who will examine the cells under a microscope to identify any abnormalities.

How Are Results Interpreted?

The results are categorized into several classifications, such as benign, suspicious for malignancy, or malignant. Your doctor will discuss these findings with you, often in collaboration with an endocrinologist or a head and neck surgeon. Follow-up tests or treatments may be recommended based on the results.