A method for reducing contamination in bodily-fluid samples using a parenteral sampling device (100), the device (100) including an inlet port (122) configured to be placed in fluid communication with a bodily-fluid source, an actuator (140), a fluid reservoir (170), and a flow control mechanism (130) configured to selectively place the fluid reservoir (170) in fluid communication with the inlet port (122), the method comprising: establishing fluid communication between the bodily-fluid source and the fluid reservoir (170); moving the actuator (140) a first distance to increase a volume of the fluid reservoir (170) such that a volume of bodily-fluid flows into the fluid reservoir (170); and moving the actuator (140) a second distance to move the flow control mechanism (130) from a first configuration, in which the flow control mechanism (130) defines at least a portion of a first fluid flow path, to a second configuration, in which the flow control mechanism (130) defines at least a portion of a second fluid flow path, the first fluid flow path defined between the inlet port (122) and the fluid reservoir (170), the second fluid flow path defined between the inlet port (122) and an outlet port (126) or a sample reservoir (180).