A microfluidics system for isolating individual sperm from a semen sample, the system comprising: a first laminar flow channel extending between a first inlet and a first outlet ; a second laminar flow channel extending between a second inlet and a second outlet ; and a third laminar flow channel extending between the first and second laminar flow channels and having a restriction configured to prevent passage of a single sperm through the third laminar flow channel , wherein flow of a semen sample through the first laminar flow channel at a pressure higher than flow of a liquid medium through the second laminar flow channel results in a single sperm being trapped by the restriction in the third laminar flow channel , the system further comprising: a fourth laminar flow channel connected between the first laminar flow channel and a third outlet ; a first valve in the first laminar flow channel between the first inlet and the third laminar flow channel ; a second valve in the first laminar flow channel between the fourth laminar flow channel and the first outlet ; and a third valve in the fourth laminar flow channel between the first laminar flow channel and the third outlet , wherein, upon closing the first and second valves and opening the third valve , a sperm trapped by the restriction in the third laminar flow channel travels to the third outlet for collection. a first laminar flow channel extending between a first inlet and a first outlet ; a second laminar flow channel extending between a second inlet and a second outlet ; and a third laminar flow channel extending between the first and second laminar flow channels and having a restriction configured to prevent passage of a single sperm through the third laminar flow channel , wherein flow of a semen sample through the first laminar flow channel at a pressure higher than flow of a liquid medium through the second laminar flow channel results in a single sperm being trapped by the restriction in the third laminar flow channel , the system further comprising: a fourth laminar flow channel connected between the first laminar flow channel and a third outlet ; a first valve in the first laminar flow channel between the first inlet and the third laminar flow channel ; a second valve in the first laminar flow channel between the fourth laminar flow channel and the first outlet ; and a third valve in the fourth laminar flow channel between the first laminar flow channel and the third outlet , wherein, upon closing the first and second valves and opening the third valve , a sperm trapped by the restriction in the third laminar flow channel travels to the third outlet for collection. a fourth laminar flow channel connected between the first laminar flow channel and a third outlet ; a first valve in the first laminar flow channel between the first inlet and the third laminar flow channel ; a second valve in the first laminar flow channel between the fourth laminar flow channel and the first outlet ; and a third valve in the fourth laminar flow channel between the first laminar flow channel and the third outlet , wherein, upon closing the first and second valves and opening the third valve , a sperm trapped by the restriction in the third laminar flow channel travels to the third outlet for collection. <EOS>