A metering device that improves the aseptic transfer of powder and reconstitution fluid into the metering device for medical use. In some implementations, the metering device comprises a housing, containing a metering chamber that defines a volume. The housing also has a connection portion, an extraction portion, and a metering member in fluid communication with the metering chamber. In other embodiments, the metering device additionally includes a dispensing aid that facilitates the dispensing of powder from a first container into the metering chamber through the connection portion. The connection portion is capable of insertion into a second container that contains fluid, thereby allowing a mixture of powder and fluid to form in the metering chamber. The mixture, then ready for use, is removable from the metering chamber through the extraction portion by an extraction device.
