A chamber for use in a rotating field to separate blood components is described. An inlet port near one end of the chamber introduces blood into the chamber for flow circumferentially about the rotational axis toward the opposite end of the chamber for separation into at least one blood component. At least one outlet port is juxtaposed next to the inlet port near the one end of the chamber for conveying one separated blood component from the channel. The chamber directs the one separated blood component to a collection region near the opposite end of the chamber. An enclosed interior collection passage within the channel leads from the collection region and directs the one collected component to the outlet port for transport from the chamber.