Table 5.
The French gauge diameters and the sizes of the cannula. Derived in accordance with Scott et al. [46].
| French gauge | External Diameter (mm) | Common intravenous cannula needle gauge | External Diameter (mm) |
|---|---|---|---|
| - | - | 24 | 0.7 |
| - | - | 22 | 0.9 |
| 3 | 1.0 | 20 | 1.1 |
| 4 | 1.34 | 18 | 1.3 |
| - | - | 17 | 1.5 |
| 5 | 1.67 | 16 | 1.7 |
| 6 | 2.0 | 14 | 2.1 |
| 7 | 2.3 | - | - |
The sizes of intravenous cannula and French gauge equivalents. In neonates and very small children, special care should be carried out for avoiding the insertion of devices that would cause complete obstruction and would not allow blood to flow past it.