A blood handling device (1) has a syringe (1(a)) for taking a blood sample, and a container (1(b)) releasably connected to the syringe. The syringe may be used to take a blood sample when the container (1(b)) is disconnected. The container is then re-connected and the full device is centrifuged so that a fraction migrates into a chamber (6) of the container (1(b)). This migration is through a fluid passageway (61, 82) between the syringe volume and the chamber (6). A connector (21) interfaces between the syringe (4, 20) and the container (5), the connector having the fluid passageway (61, 82). The connector has a first part (21(a)) forming a base for the syringe, and a second part (21(b)) arranged to connect to the container (1(b)) during centrifuging and to a cannula after removal of the container.
