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Appropriate amount of Normal Saline flush solution

We are writing new flush protocols at our facility.  What is everybody doing out there as far as saline flushes after lab draws from central lines and following TPN administration?  Our pharmacist and I differ on our opinions.  Thanks!

The most common practices
The most common practices are for 10 to 20 mL of saline, but this is really not evidence-based. This is one of those areas where no research is available to provide the scientific answer. For blood sampling, you want a large quantity to adequately remove as much of the blood components as possible that may adhere to the catheter walls. 5 to 10 mLs may be ok for starting parenteral nutrition. The purpose of all flushing procedures is to maintain patency and prevent contact between incompatibie medications but this is also an important part of your assessment of the line functionality. You will need to aspirate for a blood return and to then flush to ascertain if you are meeting any resistance to flushing. Lynn

Lynn Hadaway, M.Ed., RN, BC, CRNI

Lynn Hadaway Associates, Inc.

126 Main Street, PO Box 10

Milner, GA 30257


Office Phone 770-358-7861

Kathy Kokotis Bard Access

Kathy Kokotis

Bard Access Systems

There is no evidence based iterature or studies

manufacturers usually recommend 10 cc normal saline and 20 cc after visuous heavy solutions like dextrose or lipids or blood, or dilantin

Kathy Kokotis

Bard Access Systems

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