Comparison of flow rates achieved compared with manufacturers stated maximum flow rate
| Line type | Length (mm) | Stated flow rate by manufacturer at 75 mm Hg (mL/min) | Estimated pressure needed to achieve this flow rate in our system (mm Hg) | Proportion of stated flow achieved at 75 mm Hg (%) |
| 18G cannula | 40 | 100 | 200 | 40 |
| 20G cannula | 32 | 65 | 150 | 58 |
| 5Fr umbilical line | 400 | 24 | 125 | 71 |
| 4Fr umbilical line | 400 | 11.3 | 75 | 100 |
No manufacturer flow rate information was available for all three haemodialysis catheters or central line.