How to Flush a Catheter Correctly
Why Catheter Flushing Matters
Flushing helps prevent clots and bacteria from building up inside your catheter. Every time a catheter is used for medications, fluids, or blood draws, it should be flushed before and after use. This keeps the line clear and reduces the risk of complications like blockage or infection.
What You’ll Need
- Prefilled saline syringe (usually 10 mL of 0.9% normal saline)
- Alcohol or chlorhexidine wipes
- Clean gloves
- Heparin flush (only if prescribed)
Step-by-Step: How to Flush Your Catheter
- Wash your hands thoroughly with soap and warm water for at least 20 seconds.
- Set up a clean area. Lay out your supplies on a disinfected surface.
- Put on gloves to reduce infection risk.
- Scrub the hub. Use an alcohol wipe to clean the end of your catheter (the “hub”) for at least 15 seconds, then let it air dry.
- Prepare the syringe. Remove the cap, hold the syringe upright, and gently push to remove any air bubbles.
- Attach the syringe. Twist it securely onto the catheter hub without touching the connection point.
- Flush using the push-pause method. Slowly push 1–2 mL of saline at a time, pausing slightly between pushes. This creates turbulence that helps clear the line.
- Do not force the flush. If you feel resistance, stop and call your healthcare provider—never push harder.
- Clamp and cap. Once finished, clamp the catheter and replace the sterile cap if provided.
After Flushing
If your provider has prescribed a heparin flush, use it immediately after the saline flush following the same push-pause method. Heparin helps prevent clot formation in certain types of catheters.
Tips for Safe Catheter Care
- Flush your line on the schedule provided by your care team — even if it’s not in use.
- Always use sterile supplies and check the syringe for expiration date or damage.
- Store your supplies in a clean, dry place.
- If the catheter site looks red, swollen, or painful, contact your provider immediately.
When to Call Your Doctor
- Swelling, redness, or warmth around the catheter site
- Pain or leakage during flushing
- Resistance when pushing saline
- Fever or chills after flushing
Key Takeaway
Flushing your catheter correctly helps prevent infection and keeps your line working safely. Follow your care team’s instructions carefully and never skip scheduled flushes — it’s a simple step that can prevent serious complications.
Need Help Managing Your Catheter?
Our team specializes in minimally invasive procedures and long-term line care. Call our office today for guidance or support.
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