The color of an intravenous (IV) cannula corresponds to its gauge size, which dictates the cannula's diameter and flow rate. This color-coding system allows healthcare professionals to quickly identify the appropriate cannula for a patient's needs. Different colors represent different gauge sizes, facilitating efficient and safe administration of fluids and medications.
IV Cannula Color and Gauge Size Chart
Several sources provide varying color-coding schemes; however, a common representation includes:
- Orange: 14G (Large gauge, high flow rate)
- Medium Gray/Dark Gray: 16G (Medium gauge, medium flow rate)
- White: 17G (Medium gauge, medium flow rate)
- Deep Green: 18G (Medium gauge, medium flow rate)
- Pink: 20G (Small gauge, low flow rate)
- Deep Blue: 22G (Small gauge, low flow rate, often used for fragile veins)
- Yellow: 24G (Very small gauge, very low flow rate)
- Violet: 26G (Very small gauge, very low flow rate)
Note: Color coding can vary slightly between manufacturers, so always refer to the specific manufacturer's guidelines.
It's crucial to understand that the gauge number is inversely proportional to the diameter; a smaller gauge number indicates a larger diameter cannula. Larger diameter cannulas allow for faster fluid administration, making them suitable for situations requiring rapid fluid resuscitation, while smaller diameter cannulas are more appropriate for patients with fragile veins or those needing slower infusions. The color-coding system, therefore, aids in swift and precise cannula selection.
