Skip to content

CT-Guided Perirenal Aspiration Specimen for Culture and Drainage Catheter Placement

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

A CT-guided perirenal aspiration is a procedure in which a healthcare provider uses computed tomography (CT) imaging to guide a needle into the space around the kidney to collect a fluid specimen for culture and, when needed, to place a drainage catheter.

Quick summary

["This procedure helps identify infection in the space around the kidney and can provide both a diagnosis and a treatment pathway."]

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

Key facts at a glance

LOINC
89855-1
Short code
CT Guided Perirenal sp-R Absc drain+cath
Synonyms
CT Guided Perirenal sp-R Absc drain+cath
Category
chemistry
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 a Perirenal Aspiration?

The perirenal space is the area of fat and tissue surrounding the kidney. Sometimes fluid, pus, or an abscess can collect there. A perirenal aspiration uses a thin needle guided by CT imaging to sample that fluid so it can be examined and cultured in the laboratory.

Why CT Guidance Is Used

CT imaging gives the care team a detailed, cross-sectional view of the kidney and surrounding structures. This helps the provider choose a safe path for the needle, avoid nearby organs and blood vessels, and confirm the needle tip is in the right place.

How the Specimen Is Handled

The fluid collected is sent to the laboratory, where it may be examined under a microscope and cultured to look for bacteria or other organisms. Results help determine whether an infection is present and can guide antibiotic choices. A portion may also be used for other tests your care team orders.

Drainage Catheter Placement

If a significant fluid collection or abscess is found, the provider may place a small drainage catheter during the same procedure so the fluid can drain over time. The catheter is typically connected to a collection bag and monitored by your care team until it is no longer needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Does the procedure hurt?
You will usually receive local numbing medicine at the skin site, and some patients receive sedation for comfort. You may feel pressure or brief discomfort during the needle placement, but the care team will work to keep you as comfortable as possible.
How should I prepare for the procedure?
Your care team will give you specific instructions, which may include fasting for a period before the procedure, adjusting certain medications such as blood thinners, and arranging for someone to drive you home if sedation is used. Follow those instructions closely and tell the team about allergies and all medications you take.
When will I get my results?
Culture results often take a few days because organisms need time to grow in the laboratory. Your care team will review the results and contact you with the findings and any changes to your treatment plan. Ask your provider when to expect your specific results.
  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