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Confirmatory 24-Hour Urine Collection for Complement Component Measurement

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

This test measures levels of specific proteins in your urine over a 24-hour period that are part of your immune system’s complement pathway. These proteins help protect your body from infections and inflammation.

Quick summary

["Your doctor may order this test to check how well your immune system’s complement system is functioning over time."]

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

Key facts at a glance

LOINC
111924-7
Short code
N cnfrmd dys compl Time Endscpy
Synonyms
N cnfrmd dys compl Time Endscpy
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
endoscopy
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

A doctor may recommend this test if they suspect conditions like immune disorders, kidney disease, or certain infections that affect complement proteins. It helps track long-term changes in your immune response.

What to Expect Before the Test

You’ll need to collect all urine for 24 hours in a special container. Drink plenty of water to help your kidneys pass the proteins naturally. Avoid certain medications or foods that might interfere with results.

How the Test Is Done

After collecting urine for 24 hours, the sample is sent to a lab. The lab analyzes the urine for specific complement proteins using sensitive methods like immunoassay or nephelometry to detect small amounts.

What the Results Mean

Results show whether your urine contains normal or abnormal amounts of complement proteins. Low levels may indicate immune system dysfunction, while high levels could suggest kidney issues or other conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Confirmatory 24-Hour Urine Complement Test

Frequently asked questions

What causes abnormal complement protein levels in urine?
Abnormal levels can result from genetic disorders, immune system overactivity, kidney problems, or certain infections. Your doctor will review your medical history and other test results to determine the cause.
How often should I repeat this test?
Your doctor will decide based on your symptoms and test results. Repeating may be needed if initial results are unclear or if you have ongoing health concerns.
Can diet or medications affect this test?
Yes—some foods, medications, or supplements may influence complement protein levels. Your doctor will provide specific instructions to avoid interference during your urine collection.
  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