Ayass BioScience Circulating Tumor DNA (ctDNA) Assay is CLIA Compliant Lab Developed Test for Clinical Practice. Ayass BioScience ctDNA detects low levels of circulating tumor DNA (ctDNA) in the blood stream using NGS technology is a minimally invasive method to detect the presence of tumor DNA that is shed by cancer cells. Call us with any questions at 972-668-6005.