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Catharteric drainage fluid (catheter drainage fluid) protein mass concentration

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

This test measures the protein content in fluid collected from a urinary catheter drainage system, which may help assess kidney function or fluid balance.

Quick summary

["Your doctor may use this test to monitor protein loss or fluid accumulation in the body through catheter drainage."]

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

Key facts at a glance

LOINC
90318-7
Short code
CT Guided LE-R Drain+cath place
Synonyms
CT Guided LE-R 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 This Test Is Done

Doctors order this test when they suspect abnormal protein levels in drainage fluid, such as in cases of kidney disease, urinary tract infections, or after certain surgeries involving drainage tubes. It can also help track how well a patient’s body is retaining fluids or managing protein loss over time.

What to Expect Before the Test

No special preparation is needed. The test involves collecting fluid from your catheter drainage system, which is typically done by a healthcare professional. The sample is sent to a lab for analysis.

What the Test Results Mean

Higher-than-normal protein levels might indicate conditions like kidney disease, urinary tract leaks, or systemic inflammation. Lower-than-normal levels could suggest fluid overload or certain metabolic issues. Always discuss your results with your healthcare provider.

Common Conditions Monitored

This test is often used in patients with chronic kidney disease, those who have undergone kidney-related surgeries, or those with urinary tract issues requiring drainage. It may also be part of monitoring for conditions like nephrotic syndrome or post-surgical fluid management.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Drainage fluid protein level

Frequently asked questions

How is drainage fluid collected for this test?
The fluid is collected directly from your catheter drainage system by a healthcare professional. They will typically take a small sample and send it to a lab for analysis. No additional preparation is required beyond standard catheter care.
What does a high protein level in drainage fluid usually indicate?
A high protein level may suggest conditions like urinary tract leaks, kidney disease, or inflammation. Your doctor will consider your medical history and other test results to determine the cause.
Can this test be done at home?
No, this test requires a healthcare professional to collect the drainage fluid sample. It is typically performed in a clinical or hospital setting to ensure accuracy and safety.
  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