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CT-Guided Retroperitoneal Drainage Catheter Placement Without Contrast

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

A CT-guided procedure to place a drainage catheter in the retroperitoneum without using contrast material.

Quick summary

["This procedure uses CT imaging to safely drain an abnormal fluid collection behind the abdominal lining."]

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

Key facts at a glance

LOINC
90310-4
Short code
CT Guided Retroper Drain+cath--WO cont
Synonyms
CT Guided Retroper Drain+cath--WO cont
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?

This is a minimally invasive procedure, not a routine blood test. CT scans help guide placement of a drainage catheter into an abnormal fluid collection in the retroperitoneum, the area behind the abdominal lining. Contrast material is not used during this procedure.

Why might I need this test?

A drain may be needed to remove an accumulation of fluid, pus, blood, or other material that is causing pain, pressure, infection, or another complication. The collected fluid may also be sent to the laboratory for analysis.

How is the test performed?

After numbing the skin, an interventional radiologist uses CT images to guide a needle and drainage catheter into the fluid collection. The catheter is secured so the fluid can drain, and its position and function are checked before the procedure is completed.

How do I prepare for the test?

Follow the instructions from your care team, including any fasting, medication, and imaging requirements. Tell the team about pregnancy, allergies, kidney disease, bleeding problems, blood thinners, and any prior CT scans or contrast reactions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT-guided retroperitoneal drain placement

Frequently asked questions

Is this the same as a routine CT scan?
No. A routine CT scan creates detailed images, while this procedure uses CT guidance to place a drain through the skin.
Will I receive contrast material?
No contrast material is used for this procedure, based on the test name. CT imaging still involves exposure to radiation.
Will the drain stay in place?
It may remain in place temporarily so the collection can continue to drain. Your care team will decide when it is safe to remove it based on your condition and follow-up imaging.
  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