# Intravenous (IV) access

Intravenous (IV) or intraosseous (IO) access is indicated if the casualty is in hemorrhagic shock or at significant risk of shock (and may therefore need fluid resuscitation), or if the casualty needs medications, but cannot take them by mouth.

- An 18-gauge IV or saline lock is preferred.
- If vascular access is needed but not quickly obtainable via the IV route, use the IO route.