Mitochondria are structures within cells that play an essential role in energy production. They have their own DNA, known as mitochondrial DNA or mtDNA. Studies have shown that an increase in mtDNA content in an embryo indicates a low level of energy and implantation potential. So in IVF, when we have multiple embryos to choose from, we choose the one with the lowest mtDNA for the greatest pregnancy potential. The MitoScore is used in helping our embryologists select the best embryo for implantation.