We evaluated the relationship between mean platelet volume (MPV) and characteristics of 10,577 cord blood (CB) units in a public CB bank in Korea. Blood group O has the highest MPV (P = 0.002). MPV correlated with CB volume (r=0.121), Hb (r=0.377), WBC (r=0.111), TNCs (r=0.110), CD34+ cell (r=0.174), CD34+ cells/TNCs (r=0.157), gestational age (r = −0.102), and birth weight (r=0.023); (P<0.001 in all). MPV may be one of the useful decision parameters of process priority in CB bank.