Which color corresponds to Carbon dioxide?

Which color corresponds to Carbon dioxide?

• A. Black
• B. Brown
• C. Blue
• D. Gray

Answer: (D)

Color coding for medical gas cylinders helps staff identify contents quickly and avoid dangerous misidentification. In many anesthesia settings, carbon dioxide is color-coded gray. This distinguishes it from oxygen, which is typically green, and nitrous oxide, which is blue. The other colors listed do not match the standard for CO2, so gray is the best answer. Always read the cylinder label and markings in addition to the color, since regional standards can vary.

Color coding for medical gas cylinders helps staff identify contents quickly and avoid dangerous misidentification. In many anesthesia settings, carbon dioxide is color-coded gray. This distinguishes it from oxygen, which is typically green, and nitrous oxide, which is blue. The other colors listed do not match the standard for CO2, so gray is the best answer. Always read the cylinder label and markings in addition to the color, since regional standards can vary.