What is the maximum subcutaneous injection volume?

• A. 0.5cc
• B. 1cc
• C. 1.5cc
• D. 2cc

Answer: (B)

The main idea here is understanding how much fluid the subcutaneous tissue can reliably hold in a single injection. Subcutaneous tissue sits just under the skin and is less vascular and more distensible than muscle, so it can absorb only a limited volume in a single hit without causing discomfort or poor absorption. In routine EMS practice, about 1 mL is the maximum you’d inject subcutaneously because this amount balances delivering enough medication with minimizing tissue distension, pain, and variability in how quickly the drug enters the bloodstream. Injecting more than 1 mL increases the risk of poor absorption, sustained lumps, or even accidentally injecting into the muscle if the needle depth isn’t perfect. If a higher dose is needed, you’d typically split it into smaller subcutaneous injections at different sites or consider a different route if appropriate, rather than pushing more than 1 mL into one subcutaneous site.