Which syringe size is recommended for flushing a central venous access device with normal saline?

Which syringe size is recommended for flushing a central venous access device with normal saline?

• A. 10 mL syringe
• B. 5 mL syringe
• C. 20 mL syringe
• D. 3 mL syringe

Answer: (A)

When flushing a central venous access device, keep the pressure low to protect the catheter while effectively clearing the lumen. The syringe size matters because pressure generated during flushing depends on the syringe’s volume. A 10 mL syringe allows you to push saline with less force, producing lower, safer pressure than smaller syringes. Smaller syringes (like 5 mL or 3 mL) require more force for the same volume, which raises the flushing pressure and can risk damaging the catheter. Larger syringes can be used, but the standard minimum of 10 mL is recommended to balance safety and efficacy. So, the best choice is a 10 mL syringe for saline flushes of central venous access devices.

When flushing a central venous access device, keep the pressure low to protect the catheter while effectively clearing the lumen. The syringe size matters because pressure generated during flushing depends on the syringe’s volume. A 10 mL syringe allows you to push saline with less force, producing lower, safer pressure than smaller syringes. Smaller syringes (like 5 mL or 3 mL) require more force for the same volume, which raises the flushing pressure and can risk damaging the catheter. Larger syringes can be used, but the standard minimum of 10 mL is recommended to balance safety and efficacy. So, the best choice is a 10 mL syringe for saline flushes of central venous access devices.