Skip to content

Microscopic Examination of Fine Needle Aspirate (FNA) Fluid

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

This test involves examining cells collected from a fine needle aspiration procedure under a microscope to identify abnormal cells, infections, or other abnormalities in tissues.

Quick summary

["Microscopic analysis helps diagnose conditions like cancer, inflammation, or infections by closely examining cell shapes and structures from a small sample."]

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

Key facts at a glance

LOINC
11552-7
Short code
Microscopic Tiss FNA-Imp
Synonyms
Microscopic Tiss FNA-Imp
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
cytology
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

What Is Fine Needle Aspirate (FNA)?

A fine needle aspiration (FNA) is a procedure where a thin needle is used to collect a small sample of cells or fluid from a suspicious lump, mass, or tissue. This sample is then sent to the lab for microscopic examination.

Why Is Microscopic Examination Used?

Microscopic examination helps determine whether the cells in the sample are normal or abnormal. It can detect early signs of cancer, infections, or other conditions that may require further medical evaluation.

What Can This Test Detect?

This test can identify abnormal cell patterns that may suggest conditions such as lymphoma, thyroid nodules, breast lesions, or other malignancies. It may also help diagnose infections or inflammatory processes.

Sample Collection and Preparation

The FNA procedure is typically performed by a healthcare provider. The collected fluid or cells are then prepared on a microscope slide and stained to enhance visibility of cellular details.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

FNA Microscopy

Frequently asked questions

How often do results change patient management?
Microscopic FNA results can significantly influence treatment decisions. Abnormal findings may lead to additional diagnostic tests, biopsies, or targeted therapies depending on the suspected condition.
Can this test be done without a biopsy?
Yes, FNA combined with microscopic examination is often used as a less invasive alternative to a surgical biopsy. It provides critical information about tissue characteristics without removing a larger tissue sample.
What if the test shows no abnormal cells?
If the microscopic examination of FNA fluid shows no abnormal cells, it may indicate that the initial suspicion was incorrect, or the condition may require further investigation with other tests or imaging.
  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