Table 1.

Types of cell-free DNA (cfDNA) and their potential applications.

Types of Cell-Free DNA	Abbreviations	Potential Application	References
Circulating cell-free mitochondrial DNA	ccf mtDNA	Diagnostic and predictive marker in various disease states, marker of cell death and non-specific tissue damage	[25,26,27,28,29]
Circulating tumour DNA	ctDNA	Marker in oncological diagnostics, monitoring of tumour development	[30,31]
Cell-free foetal DNA	cffDNA	Prenatal diagnostics, detection of foetal defects	[32,33,34]
Donor-derived cell-free DNA	dd-cfDNA	Evaluation of post-transplant complications	[35,36]