A compound attribute that is the ratio of amount of frataxin, mitochondrial (human) in blood to amount of thioredoxin-dependent peroxide reductase, mitochondrial (human) in blood. The trait is FXN/PRDX3 protein level ratio in blood (OBA_2053774). Also known as: the ratio of amount of frataxin, mitochondrial (human) in blood to amount of thioredoxin-dependent peroxide reductase, mitochondrial (human) in blood.