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A saline lock is an IV access device that keeps a vein available without continuous IV fluid running. It is also called an intermittent IV lock or capped IV. The catheter stays in the vein and is connected to a small capped access port. Staff can use it to give medicine, flush the line, or connect IV fluids when needed.
read more about saline lock ...A clinician places a small IV catheter into a vein, then caps it instead of connecting continuous tubing. The line can be flushed with sterile saline to check patency and help keep it open. When medicine or fluid is needed, staff clean the access port and connect the ordered treatment. After use, the line can be flushed and capped again.
A saline lock can be used when a patient needs IV access but does not need continuous fluids. It is common in emergency departments, hospital units, outpatient areas, and procedure settings. It can reduce tubing clutter and allow easier movement compared with a continuous IV line. The care team decides whether a saline lock fits the treatment plan.
The site should be checked for pain, redness, swelling, warmth, leaking, bleeding, or loose dressing. These signs can point to irritation, infection, or fluid leaking into tissue. The access port should be cleaned before use to reduce contamination risk. Tell the nurse or care team if the site hurts, the dressing lifts, or the line feels loose.
Possible problems include infiltration, phlebitis, infection, blockage, bleeding, or accidental removal. Staff remove the saline lock when it is no longer needed or when the site is no longer safe to use. Removal is quick and involves taking out the catheter and covering the site. Keep the bandage on as directed after removal.
A saline lock is a type of IV access. The difference is that it is capped and used intermittently instead of being connected to continuous IV fluid.
No. The needle is removed after placement, and a soft catheter stays in the vein. The capped port gives staff access when treatment is needed.
Yes, as long as your care team says it is safe. Avoid pulling on the site, getting the dressing wet, or bumping the catheter.
Flushing helps confirm that the line works and can help keep it open. Staff should follow facility policy for when and how the line is flushed.
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Peripheral Line Placement. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK539795/. Date Accessed May 26, 2026.
Summary of Recommendations: Guidelines for the Prevention of Intravascular Catheter-Related Infections. Centers for Disease Control and Prevention. https://www.cdc.gov/infection-control/hcp/intravascular-catheter-related-infections/summary-recommendations.html. Date Accessed May 26, 2026.
Going Home With a Saline Lock: Care Instructions. MyHealth.Alberta.ca. https://myhealth.alberta.ca/Health/Pages/conditions.aspx?hwid=custom.ab_vascularaccess_normalsalinelock_ac. Date Accessed May 26, 2026.
Flushing a Saline Lock and Converting a Saline Lock to a Continuous IV Infusion. BC Open Textbook. https://opentextbc.ca/clinicalskills/chapter/3-3-care-of-iv-tubing-administration-sets/. Date Accessed May 26, 2026.