Tumor DNA (Circulating) – Genomic Analysis (Tumor-Specific)
This test checks for small amounts of DNA from a specific type of cancer (tumor DNA) in your blood, using a sample collected during a blood draw. It helps doctors monitor whether your cancer is responding to treatment or if it may have spread.
["This test may help track cancer progression or treatment effectiveness by detecting genetic changes unique to your tumor."]
Key facts at a glance
- LOINC
- 107205-7
- Short code
- TCRG gene Tube A Spec
- Synonyms
- TCRG gene Tube A Spec
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- molgen
- 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 cancer (such as breast, lung, or colorectal cancer) and want to monitor it over time. It can also be used to check for early signs of cancer recurrence or spread to other parts of the body. This test is often used alongside other diagnostic tests.
How the Test Works
A small amount of blood is drawn, and the DNA from your blood cells is analyzed for genetic mutations or other changes that match your tumor’s DNA profile. Advanced lab techniques identify these tumor-specific markers to provide insights into disease behavior.
Sample Collection and Preparation
You’ll have a simple blood draw, similar to a routine lab test. The blood sample is processed to isolate DNA, which is then tested for tumor-specific genetic markers. No special preparation is needed, but fasting may not be required unless instructed by your doctor.
What to Expect During the Test
The test is usually painless and takes about 5–10 minutes. You may feel slight discomfort at the needle insertion site, but most people tolerate it well. Results are typically ready within a few days to a couple of weeks, depending on lab processing times.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test provides critical information about your cancer’s genetic makeup, helping doctors determine the best treatment plan, assess how well treatment is working, and detect early signs of cancer returning. It can also guide decisions about targeted therapies or clinical trials.
Short name
Tumor DNA Profile
Frequently asked questions
How long does it take to get results from this test?
Is there any risk or side effect from this blood draw?
Can I drink or eat before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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