Cancer-related DNA methylation analysis using a probe-based assay (e.g., for tumor DNA detection)

What This Test Measures

The test detects altered methylation patterns in DNA fragments from cells that may have originated in cancerous tissues. These changes can be present in your blood even if cancer isn’t currently detected elsewhere in your body.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have a high risk of certain cancers, are undergoing cancer treatment, or if you have symptoms that could suggest underlying malignancy. It’s also sometimes used as part of a broader cancer screening or monitoring plan.

Sample Collection and Process

A blood sample is collected, typically from a vein in your arm. The DNA from your blood cells is extracted and analyzed for specific methylation markers using a specialized probe technique. This process helps identify fragments of DNA that may indicate cancer-related changes.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw if instructed by your provider. Wear a loose shirt for easy access to your arm.