A method for producing individually processed fluid samples, comprising the steps: (a) providing a continuous fluid sample processing device with: - a syringe plunger pump positioned vertically with a plunger at the top and an opening at the bottom and said opening operably coupled to - a multiport pump head configured to connect the syringe plunger pump with i. at least one fluid sample source, ii. at least one sample processing fluid source, iii. at least one gas inlet, iv. at least one outlet for transferring the fluids in the syringe plunger pump, preferably to a further device, more preferably to a further processing and/or analytical device, v. optionally at least one waste fluid exit, and vi. optionally at least one source for further sample processing fluid(s), rinse fluid, disinfection fluid, and/or cleaning fluid, wherein the plunger displacement space in the syringe plunger pump forms the mixing chamber for the fluid sample, the sample processing fluid, the gas, and optionally the further sample processing fluid, (b) loading the at least one fluid sample through the multiport pump head into the syringe plunger pump of device from the at least one sample source, (c) loading the least one sample processing fluid through the multiport pump head into the syringe plunger pump of device from the at least one sample processing fluid source, (d) loading at least one gas bubble through the multiport pump head into the syringe plunger pump of device from the at least one gas inlet, which bubble floats through the fluids to the top of the syringe plunger pump, thus mixing the fluids in the syringe plunger pump and accumulating at the top, (e) transferring the mixed fluids followed by the gas bubble in the syringe plunger pump through the at least one outlet of the multiport pump head, preferably to a further device, more preferably to a further processing and/or analytical device, and (f) optionally loading the further sample processing fluid, a rinse fluid, a disinfection fluid and/or a cleaning fluid through the multiport pump head from the at least one optional source. (a) providing a continuous fluid sample processing device with: - a syringe plunger pump positioned vertically with a plunger at the top and an opening at the bottom and said opening operably coupled to - a multiport pump head configured to connect the syringe plunger pump with i. at least one fluid sample source, ii. at least one sample processing fluid source, iii. at least one gas inlet, iv. at least one outlet for transferring the fluids in the syringe plunger pump, preferably to a further device, more preferably to a further processing and/or analytical device, v. optionally at least one waste fluid exit, and vi. optionally at least one source for further sample processing fluid(s), rinse fluid, disinfection fluid, and/or cleaning fluid, wherein the plunger displacement space in the syringe plunger pump forms the mixing chamber for the fluid sample, the sample processing fluid, the gas, and optionally the further sample processing fluid, - a syringe plunger pump positioned vertically with a plunger at the top and an opening at the bottom and said opening operably coupled to - a multiport pump head configured to connect the syringe plunger pump with i. at least one fluid sample source, ii. at least one sample processing fluid source, iii. at least one gas inlet, iv. at least one outlet for transferring the fluids in the syringe plunger pump, preferably to a further device, more preferably to a further processing and/or analytical device, v. optionally at least one waste fluid exit, and vi. optionally at least one source for further sample processing fluid(s), rinse fluid, disinfection fluid, and/or cleaning fluid, i. at least one fluid sample source, ii. at least one sample processing fluid source, iii. at least one gas inlet, iv. at least one outlet for transferring the fluids in the syringe plunger pump, preferably to a further device, more preferably to a further processing and/or analytical device, v. optionally at least one waste fluid exit, and vi. optionally at least one source for further sample processing fluid(s), rinse fluid, disinfection fluid, and/or cleaning fluid, (b) loading the at least one fluid sample through the multiport pump head into the syringe plunger pump of device from the at least one sample source, (c) loading the least one sample processing fluid through the multiport pump head into the syringe plunger pump of device from the at least one sample processing fluid source, (d) loading at least one gas bubble through the multiport pump head into the syringe plunger pump of device from the at least one gas inlet, which bubble floats through the fluids to the top of the syringe plunger pump, thus mixing the fluids in the syringe plunger pump and accumulating at the top, (e) transferring the mixed fluids followed by the gas bubble in the syringe plunger pump through the at least one outlet of the multiport pump head, preferably to a further device, more preferably to a further processing and/or analytical device, and (f) optionally loading the further sample processing fluid, a rinse fluid, a disinfection fluid and/or a cleaning fluid through the multiport pump head from the at least one optional source.