The disappearance of electrophoretically identifiable 3H-fucosylated glycoproteins from the cell surface of L6 cells is random and follows monophasic kinetics with a half-life of 9 hours. Approximately 47% and 53% of that loss is due to shedding and to degradation, respectively. Shedding also occurs with monophasic kinetics. Most of the electrophoretically identifiable-shed fucosyl-glycoproteins are released with homogeneous rates but do not represent a random sampling of the surface.