What does a higher gauge size indicate about a catheter?

A higher gauge size indicates that the catheter has a smaller internal diameter. The gauge system used for catheters works inversely; as the gauge number increases, the diameter decreases. This means that a 20-gauge catheter is smaller in diameter than an 18-gauge catheter. The choice of gauge can affect fluid flow rates, compatibility with various medications, and the size of the veins that can be accessed.

Understanding this relationship is crucial for healthcare professionals when selecting the appropriate catheter for a procedure, ensuring sufficient flow rates and minimizing complications.