Mechanisms of cyanosis Caused by absolute increase of amount of reduced Hb in blood, usually 5g/dl(capillary) The higher the hemoglobin concentration The greater tendency toward cyanosis gdI 20 18 16 15 口 Total Hb 12 □R-Hb 10 8 b orm Polycythemia Anemia15 5 20 5 5 5 0 2 4 6 8 10 12 14 16 18 20 Total Hb R-Hb Normal Polycythemia Anemia g/dl Mechanisms of Cyanosis Caused by absolute increase of amount of reduced Hb in blood, usually > 5g/dl (capillary) The higher the hemoglobin concentration, The greater tendency toward cyanosis