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Epidermal Growth Factor Receptor (EGFR) Mutation Analysis in Tumor Tissue

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

This test checks for specific genetic changes in a sample of your tumor tissue that may help determine if a targeted cancer treatment could be effective for you.

Quick summary

["Determines if targeted therapy may be an option based on genetic mutations in your cancer cells."]

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

Key facts at a glance

LOINC
18218-8
Short code
Epidis IgM Tiss Ql
Synonyms
Epidis IgM Tiss Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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

Doctors may order this test if you have a type of cancer (such as non-small cell lung cancer) that could potentially respond to treatments targeting EGFR mutations. It helps guide treatment decisions by identifying whether your tumor contains these genetic variations.

How the Test Works

A small sample of your tumor tissue is collected (often during surgery or a biopsy) and analyzed using advanced laboratory techniques, such as sequencing, to detect EGFR mutations. These mutations are small changes in the gene that can influence how cancer cells grow and respond to treatments.

Sample Collection and Preparation

Your tumor tissue sample is sent to a lab where it is processed to extract DNA. The lab then uses specialized methods to identify any EGFR mutations present in the DNA.

What to Expect Before the Test

You may need to undergo a biopsy or surgery to obtain the tumor tissue sample. Your healthcare provider will explain the procedure, including any risks or preparation steps needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

EGFR mutations are important because they can indicate whether certain targeted therapies, such as tyrosine kinase inhibitors, may be effective against your cancer. If mutations are found, treatment options may be tailored to target those specific changes, potentially improving outcomes and reducing side effects compared to traditional chemotherapy.

Short name

EGFR Mutation Test

Frequently asked questions

Will this test affect my cancer treatment plan?
Yes, the results of this test can directly influence your treatment choices. If mutations are detected, your doctor may recommend therapies specifically designed to target those mutations. If no mutations are found, other treatment options may be explored.
How long will it take to get the results?
Test results typically take several weeks to a few months, depending on the lab’s processing time and the complexity of the analysis. Your doctor will contact you once the results are ready.
What if my test results are positive for EGFR mutations?
If your test is positive, your doctor will discuss targeted treatment options that may be most effective for your cancer. These treatments are designed to block the abnormal growth signals caused by the mutations, and they may have fewer side effects than traditional cancer therapies.
  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