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Subphrenic drainage fluid analysis (cath place)

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

This test involves collecting and analyzing fluid from the area below the diaphragm (subphrenic space) using a catheter placed during surgery. It helps assess for infection, inflammation, or other abnormalities in this region.

Quick summary

["This test supports diagnosis of post-surgical complications or hidden infections in the abdomen."]

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

Key facts at a glance

LOINC
89831-2
Short code
CT Guided Subphrenic Drain+cath place
Synonyms
CT Guided Subphrenic Drain+cath place
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

Why is this test done?

Your doctor may recommend this test if you had surgery involving the diaphragm or abdomen and suspect complications like an abscess (a localized collection of pus) or fluid buildup. The procedure is typically done during or shortly after surgery to place a catheter to drain fluid safely.

What does the test involve?

A healthcare provider will insert a thin tube (catheter) into the subphrenic space through your skin. Fluid will be collected and sent to the lab for analysis. The test may involve microscopic examination of cells, culture for bacteria, or chemical testing of the fluid to identify infections, inflammation, or other issues.

What can the test detect?

The test can identify signs of infection (such as white blood cells or bacteria), inflammation (like elevated protein levels), or abnormal fluid composition. These findings help determine if there’s an underlying issue requiring further treatment, such as antibiotics or drainage procedures.

How does this test help your care?

Results from this test provide critical information to guide your treatment plan. For example, if infection is confirmed, your doctor may adjust your medication or recommend additional procedures to clear the fluid and prevent complications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Will I feel pain during the procedure?
You may feel mild discomfort or pressure during the catheter insertion, but it’s usually managed with local anesthesia. Most patients describe it as similar to a needle stick. You’ll likely be awake during the procedure but may receive sedation if needed.
How long will I need to stay in the hospital or recovery area?
The procedure itself takes a few minutes, but you may need to stay in the hospital or recovery area for observation afterward, depending on your condition. Your doctor will determine the appropriate length of stay based on your recovery and test results.
What are the risks or side effects of this test?
Common risks include mild bruising, soreness at the insertion site, or a small risk of infection or bleeding. Rarely, complications like puncture of nearby organs or excessive fluid loss may occur, but these are typically managed promptly by medical staff.
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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