Skip to content

Fine Needle Aspiration Cytology of the Thyroid (FNA Cytology)

Published: August 9, 2026Updated: August 16, 2026

This test involves collecting cells from your thyroid gland using a thin needle, then examining them under a microscope to check for abnormalities like benign growths, inflammation, or early signs of cancer.

Quick summary

["A thyroid FNA cytology helps doctors diagnose thyroid conditions with precision, often guiding treatment decisions."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
47524-4
Short code
Cytology Thyroid FNA Doc Cyto
Synonyms
Cytology Thyroid FNA Doc Cyto
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
cyto-stain
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may recommend this test if you have symptoms like a lump or swelling in your neck, unexplained weight changes, or an abnormal thyroid ultrasound. It’s also used to evaluate thyroid nodules or after a biopsy for further analysis.

What to Expect Before the Test

During the procedure, a healthcare provider will insert a thin needle into your thyroid while you sit comfortably. A small amount of fluid or cells will be collected, and you may feel slight discomfort but no pain. The procedure usually takes a few minutes.

What Happens After the Test

The collected cells are sent to a lab for microscopic examination by a pathologist, who will classify the results into categories such as benign, suspicious, or malignant (if cancer is suspected). Results are typically available within 1–2 weeks.

Possible Results and Their Meanings

Suspicious: Indicates a higher risk of cancer, which may require additional tests (e.g., biopsy or follow-up imaging) to confirm.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Malignant: Confirms cancerous cells, guiding further treatment like surgery, radiation, or targeted therapy.

Short name

Thyroid FNA Cytology

Frequently asked questions

How long will I have to wait for results?
Results are usually ready within 1–2 weeks, depending on lab processing times. Your doctor will contact you directly with the findings.
Can I eat or drink before the test?
No special diet is required. You may eat and drink normally unless your doctor advises otherwise.
Is the procedure painful?
You may feel slight discomfort during the needle insertion, but it’s usually brief. Most patients describe it as mild and manageable with over-the-counter pain relievers if needed.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy