What angle of insertion is used when placing an intravenous cannula?

What angle of insertion is used when placing an intravenous cannula?

• A. 5-15 degree angle
• B. 90 degrees
• C. 45-60 degree angle
• D. 0 degree

Answer: (A)

When placing an intravenous cannula, the goal is to enter the vein with minimal tissue trauma while achieving a secure entry. A shallow insertion angle is used so the needle can pierce the skin and vein gently and still allow the catheter to advance into the lumen. About 5–15 degrees is the typical angle because it provides just enough tilt to access the vein without skimming along the surface or punching too steeply and risking deeper damage. If you tried a perpendicular angle (about 90 degrees), you’d hit the vein more bluntly, miss its entry, or cause more tissue injury. A steeper angle like 45–60 degrees is unnecessarily aggressive for a peripheral IV and increases the chance of going through the vein wall or causing trauma. A zero-degree angle would mean staying flat against the skin and is unlikely to puncture into the vessel properly. Once you see a flash of blood, you advance the catheter into the vein and withdraw the needle while keeping the catheter in place, then slide it forward to secure the line.

When placing an intravenous cannula, the goal is to enter the vein with minimal tissue trauma while achieving a secure entry. A shallow insertion angle is used so the needle can pierce the skin and vein gently and still allow the catheter to advance into the lumen. About 5–15 degrees is the typical angle because it provides just enough tilt to access the vein without skimming along the surface or punching too steeply and risking deeper damage.

If you tried a perpendicular angle (about 90 degrees), you’d hit the vein more bluntly, miss its entry, or cause more tissue injury. A steeper angle like 45–60 degrees is unnecessarily aggressive for a peripheral IV and increases the chance of going through the vein wall or causing trauma. A zero-degree angle would mean staying flat against the skin and is unlikely to puncture into the vessel properly.

Once you see a flash of blood, you advance the catheter into the vein and withdraw the needle while keeping the catheter in place, then slide it forward to secure the line.