An apparatus for obtaining a bodily fluid sample from a patient, the apparatus comprising: a pre-sample reservoir configured to receive and isolate a first volume of bodily-fluid withdrawn from the patient; a diversion mechanism including an inlet port, a first outlet port, and a second outlet port, the inlet port configured to be coupled to a lumen-defining device for receiving bodily-fluids from the patient, the first outlet port configured to fluidically couple the pre-sample reservoir to the diversion mechanism and the second outlet port configured to fluidically couple a sample reservoir (680, 680', 690, 690') to the diversion mechanism, the diversion mechanism defining a first fluid flow path configured to place the first outlet port in fluid communication with the inlet port and a second fluid flow path configured to place the second outlet port in fluid communication with the inlet port; and a flow controller at least partially disposed within the diversion mechanism, a portion of the flow controller configured to be engaged by a user to move the flow controller within the diversion mechanism, the flow controller including a seal defining a first channel and a second channel, the flow controller configured to be moved between a first configuration, in which the first channel is in fluid communication with the first fluid flow path to allow the first volume of bodily-fluid to be transferred to the pre-sample reservoir, and a second configuration, in which the second channel is in fluid communication with the second fluid flow path to allow a second volume of bodily-fluid to be transferred to the sample reservoir. a pre-sample reservoir configured to receive and isolate a first volume of bodily-fluid withdrawn from the patient; a diversion mechanism including an inlet port, a first outlet port, and a second outlet port, the inlet port configured to be coupled to a lumen-defining device for receiving bodily-fluids from the patient, the first outlet port configured to fluidically couple the pre-sample reservoir to the diversion mechanism and the second outlet port configured to fluidically couple a sample reservoir (680, 680', 690, 690') to the diversion mechanism, the diversion mechanism defining a first fluid flow path configured to place the first outlet port in fluid communication with the inlet port and a second fluid flow path configured to place the second outlet port in fluid communication with the inlet port; and a flow controller at least partially disposed within the diversion mechanism, a portion of the flow controller configured to be engaged by a user to move the flow controller within the diversion mechanism, the flow controller including a seal defining a first channel and a second channel, the flow controller configured to be moved between a first configuration, in which the first channel is in fluid communication with the first fluid flow path to allow the first volume of bodily-fluid to be transferred to the pre-sample reservoir, and a second configuration, in which the second channel is in fluid communication with the second fluid flow path to allow a second volume of bodily-fluid to be transferred to the sample reservoir.