Abstract: A blood sampling/injecting valve includes a housing formed with a cavity extending along a longitudinal axis of the housing, the cavity is adapted for sealingly receiving a syringe Luer connector and the housing further is provided with an inlet port and an outlet port. The valve includes also a plunger formed with a through going communication conduit and with a flow path for a liquid. The flow path is configured as a recess, which is opened to a top face of the plunger and to a lateral surface of the plunger. The plunger is axially displaceable by the Luer connector between a flow position in which the communication conduit directly communicates between the inlet port and the outlet port and a sampling/injecting position in which the flow path directly communicates between the Luer connector and the outlet port, while the inlet port is disconnected from the outlet port. The plunger is normally biased into the flow position.