What is a heparin or saline lock used for?

A heparin or saline lock is primarily used to maintain vein access for administering medications without the need for continuous intravenous fluid administration. This device allows healthcare professionals to access a patient’s venous system as needed, minimizing discomfort and the risk of complications associated with having a continuous IV line.

Using a heparin or saline lock enables intermittent drug delivery, such as antibiotics or other necessary medications, while keeping the vein open for future use. Heparin locks specifically use a small amount of heparin to prevent clotting within the catheter, whereas saline locks utilize sterile saline for flushing. This method ensures that the vascular access remains patent and ready for subsequent medication delivery without continuously infusing fluids.

In contrast, the other options pertain to uses that exceed the primary function of a heparin or saline lock, such as continuous fluid administration or monitoring vital signs, which are not the main purposes of this type of venous access.