In general, cvanosis becomes apparent when the mean capillary concentration ot reduced hemoglobin exceeds 50 g/l (5g/dL). It is the absolute rather than the relative quantity of reduced hemoglobin that is important in producing cyanosisIn general, cyanosis becomes apparent when the mean capillary concentration of reduced hemoglobin exceeds 50 g/L (5g/dL). It is the absolute rather than the relative quantity of reduced hemoglobin that is important in producing cyanosis