Instructions
Enter any online match and collect as many "dropped items" pickups as possible. Continue this until you've stored two "scrap metal" items in your backpack.
Enter the "Crafting" screen from the main menu. Move two pieces of scrap metal to the "crafting area," then place your "Ubersaw" weapon in the crafting area.
Click on the "Create it!" button to produce the "Vita-Saw" weapon.
Choose the "Medic" character class from the class select screen, then equip the "Vita-Saw" as your melee weapon.
Enter any match and equip the "Vita-Saw." By aiming it at an enemy, you will be able to see their level of health and communicate it to your team.