What is the purpose of a heparin lock?

The purpose of a heparin lock is primarily to maintain intravenous (IV) access without the need for continuous fluid infusion. This is particularly important in clinical settings where a patient may need intermittent medication administration or fluids but does not require a constant flow of IV fluids. By using a heparin lock, which involves flushing the IV line with a saline solution followed by a small amount of heparin, the vascular access remains patent — meaning open and available for future use — without having to keep the IV fluid continuously running.

This method helps to reduce the risk of complications associated with continuous infusion, such as fluid overload or potential adverse effects from the infusate. By securing the IV access in this manner, healthcare providers can easily attach medications when needed without the inconvenience and potential complications of a continuously infusing line.