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CT-Guided Drainage Catheter Placement, with or without Intravenous Contrast

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

A CT-guided procedure to place a drainage catheter into an abnormal fluid collection, using intravenous contrast only if needed.

Quick summary

["This procedure uses CT images to safely drain a fluid collection, and the drained fluid may be sent for laboratory testing."]

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

Key facts at a glance

LOINC
46291-1
Short code
CT Guide Drain+cath place--WO+W contr IV
Synonyms
CT Guide Drain+cath place--WO+W contr IV
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct
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 is this test?

CT-guided drainage catheter placement is a minimally invasive procedure in which a radiologist uses CT imaging to guide a thin drainage tube into an abnormal fluid collection, such as an abscess, cyst, or fluid buildup.

Why might I need this test?

Drainage may be needed to remove infection, relieve pressure, promote healing, or obtain fluid for laboratory testing. Your clinician will explain the suspected location and the reason the procedure is being recommended.

How is the test performed?

You will usually lie on a CT table, and the skin around the insertion site is cleaned and numbed. Under CT guidance, the catheter is advanced into the fluid collection, and fluid is drained. Intravenous contrast may be given to help identify the collection and surrounding structures.

How do I prepare for the test?

Follow the instructions from the imaging center, including restrictions on eating, drinking, and medicines if sedation or contrast will be used. Tell the care team about prior contrast reactions, kidney disease, pregnancy, bleeding disorders, and any blood thinners.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT-guided drainage catheter placement

Frequently asked questions

Is the drainage procedure painful?
Local anesthetic usually numbs the insertion site, but you may feel pressure or discomfort during catheter placement. Sedation may be offered for some patients.
Will I need intravenous contrast?
Contrast may be used to improve CT visualization, depending on the collection and the imaging plan. The radiology team will explain whether it is needed and assess your risk for a contrast reaction.
Will the drained fluid be tested?
It may be sent for laboratory analysis, such as culture or chemical testing, if your clinician considers it useful. The fluid can also be evaluated during the procedure.
  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