A drainage and/or collection system (1) for biological fluids includes at least one conduit (40) for transporting a biological fluid (F) from a catheter (10) to a collection device (50) and a gas pressure source (70) configured to feed a gas (G) into the at least one conduit (40) between the catheter (10) and the collection device (50). The gas (G) causes the biological fluid (F) arranged in the at least one conduit (40) to drain into the collection device (50). A method includes inserting a catheter (10), draining a fluid (F) into a collection device (50) via a conduit (40), and introducing gas (G) into the conduit (40) so as to force fluid (F) remaining in the conduit (40) into the collection device (50).
