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Guided Tunneled Central Venous Catheter (CV Catheter) Flush with Saline

Published: August 9, 2026Updated: August 16, 2026

This test involves flushing a specialized vein access port (CV catheter) with saline to ensure it remains clear and functional. It’s part of routine maintenance for patients with long-term vascular access.

Quick summary

["A simple check to keep your vein access working properly."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
72549-9
Short code
RF Guided Tunneled CVC rem
Synonyms
RF Guided Tunneled CVC rem
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
rf
CPT
86430
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Does This Test Measure?

This test does not measure a specific substance or chemical in your blood. Instead, it verifies that the CV catheter is properly connected and that saline can flow freely through it. The process ensures there are no blockages or leaks that could affect your ability to receive medications or fluids through this port.

Why Is This Test Done?

A CV catheter is a medical device inserted into a large vein, often used for long-term treatment or therapy. Regular flushing helps maintain the patency (open) of the catheter, preventing clots or infections. This test is typically performed during routine clinic visits or before certain procedures.

What to Expect During the Test

You will likely be seated or lying down while a healthcare provider connects a saline solution to your CV catheter. A small amount of saline will be gently flushed through the port. You may feel a slight pressure or warmth, but it should not cause pain. The process usually takes a few minutes.

Preparation and Restrictions

No special preparation is needed for this test. You may continue with your usual activities, but avoid heavy lifting or strenuous exercise immediately after the procedure to prevent any accidental dislodgment of the catheter.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CV Catheter Flush Test

Frequently asked questions

How often is this test performed?
The frequency depends on your medical needs and the guidelines set by your healthcare team. Some patients may need this test every few weeks or months, while others may require it less often. Your provider will discuss this with you during your visit.
What happens if the test shows a problem with my CV catheter?
If there is an issue with the catheter during the flush, your healthcare provider will assess it and may perform additional tests or adjustments. This could include flushing more frequently, using different solutions, or consulting with a specialist to ensure your catheter remains properly maintained.
Can I still receive treatments through my CV catheter if the flush test is done?
Yes, the flush test itself does not affect your ability to receive treatments. However, if there is a concern during the procedure, your healthcare provider may temporarily pause treatments until the issue is resolved. Always follow your provider’s instructions for any delays or changes.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy