The size of a cannula is indicated by its gauge number: the smaller the gauge number, the bigger the cannula.
Here's a breakdown:
According to Osmosis, intravenous cannulas typically range from 14 to 22 gauge. This can be confusing, as the higher the gauge number, the smaller the needle.
Understanding Cannula Gauge Sizes
| Gauge Number | Cannula Size | Common Use |
|---|---|---|
| 14 | Largest | Rapid fluid or blood infusion, often used in trauma settings |
| 16 | Large | Rapid fluid infusion, surgical procedures |
| 18 | Medium | Blood transfusions, standard IV fluids |
| 20 | Medium | Routine intravenous fluids, medication administration |
| 22 | Small | Small or fragile veins, children, older adults, and patients on long term therapy. |
Key Points:
- Inverse Relationship: A higher gauge number indicates a smaller needle diameter, and a lower gauge number means a larger diameter.
- Common Range: Intravenous cannulas range from 14 gauge (largest) to 22 gauge (smallest).
- Practical Application: 14 and 16 gauge cannulas are typically reserved for rapid infusion situations, while 20 and 22 gauge are more commonly used for routine IV therapy.
Therefore, a 14-gauge cannula is larger than a 22-gauge cannula.
