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Genetic mutation analysis for CDKN2A/CDK4 gene variants in whole blood

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

This test checks for changes (mutations) in the CDKN2A and CDK4 genes, which are linked to certain cancers and inherited conditions. It examines DNA from your blood to identify specific genetic variations that may increase cancer risk.

Quick summary

["This test helps assess inherited cancer risks by detecting gene mutations that could influence cancer development over time."]

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

Key facts at a glance

LOINC
57927-6
Short code
CDKN2A-CDK4
Synonyms
CDKN2A+CDK4 gene Mut Anl Bld/T
Category
chemistry
Sample
whole-blood
Container
EDTA (lavender/purple-top) tube for whole blood; sterile container for tissue specimens
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
CPT
81479
SNOMED
444923006
Specimen volume
3-5 mL whole blood; tissue: minimum 5 mg fresh tissue or paraffin-embedded tissue block
Stability
Whole blood: 24 hours at room temperature, 7 days at 2-8°C; Tissue: formalin-fixed paraffin-embedded (FFPE) tissue stable indefinitely at room temperature; Fresh tissue: 24 hours at 2-8°C
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
168–720 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have a family history of certain cancers, such as melanoma, pancreatic cancer, or other types linked to CDKN2A/CDK4 mutations. It may also be suggested if you have been diagnosed with a cancer linked to these genes or if you are part of a genetic counseling or cancer prevention program.

What to Expect Before the Test

No special preparation is needed. You will provide a small blood sample, usually drawn from your arm. The sample is processed to extract DNA for genetic analysis.

What the Test Results Mean

Results can be positive (mutation detected) or negative (no mutation found). A positive result indicates a genetic variation associated with increased cancer risk. Results are interpreted by a healthcare provider or genetic counselor in the context of your medical history and family background.

Common Conditions Linked to These Genes

Mutations in CDKN2A and CDK4 are linked to several hereditary cancers, including melanoma, pancreatic cancer, and certain types of sarcoma. These genes play a role in cell cycle regulation, and their mutations can increase the risk of developing cancer.

Reference range

Nominal result: Mutation Detected / Mutation Not Detected. Reference range is the absence of pathogenic CDKN2A and CDK4 gene mutations in healthy individuals without hereditary melanoma-pancreatic cancer syndrome.N/A

Specimen: whole-blood

No fasting required. Informed consent is recommended prior to genetic testing. Genetic counseling prior to and following testing is advised. Patient should be informed about implications for family members and potential insurance/discrimination concerns (GINA protections).

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CDKN2A/CDK4 Mutation Test (Blood)

Frequently asked questions

What Does a Positive Test Result Mean?
A positive result means your blood sample contains mutations in the CDKN2A/CDK4 genes that are linked to an increased risk of certain cancers. This does not mean you will definitely get cancer, but it may prompt additional monitoring or preventive strategies.
Will This Test Show All Possible Cancer Risks?
No, this test only checks for mutations in the CDKN2A and CDK4 genes. There are many other genes and factors that can influence cancer risk. A genetic counselor can help explain other potential risks based on your results and family history.
Can I Get This Test Without a Doctor’s Order?
Typically, this test is performed only with a healthcare provider’s recommendation. Direct-to-consumer genetic testing for these specific mutations is not widely available or recommended without professional guidance.
  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