Volume of solution of a single cartridge of LA

• A. 0.5 mL
• B. 1.8-1.7 mL
• C. 2.5 mL
• D. 3.0 mL

Answer: (B)

A single dental local anesthetic cartridge (carpuIe) is designed to hold about 1.7 to 1.8 milliliters of solution. That fixed volume is why the standard cartridge size is described as roughly 1.8 mL. Knowing this helps you calculate how much drug you’re delivering per cartridge: with lidocaine 2%, that’s about 20 mg per mL, so roughly 36 mg of lidocaine per cartridge (20 mg/mL × 1.8 mL). Epinephrine doesn’t change the volume, but it does affect how much total drug you can safely administer to a patient. The other numbers proposed (0.5 mL, 2.5 mL, 3.0 mL) don’t match the actual cartridge capacity, which is why the 1.7–1.8 mL range is the correct reference.