● Purpose: it is applied to fetal noninvasive birth defect screening (noninvasive Down's test), tumor discovery and . research, tumor treatment progress and efficacy evaluation research, acute disease molecular diagnosis and detection, clinical drug development and testing.

● DNA preservatives are safe and non-toxic, fix blood cells, inhibit extracellular nucleases, prevent the release of genomic DNA from blood cells, and protect the stability of free DNA from degradation, providing a better scheme for the research and application of free DNA in blood.

● Free DNA samples can be stored at room temperature for up to 14 days, making sample collection, transportation and storage convenient.