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Cystatin C - Urine Concentration (Quantitative)

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

This test measures the concentration of cystatin C in your urine, a protein that helps assess kidney function.

Quick summary

["Urine cystatin C helps monitor kidney health by checking protein levels in your urine."]

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

Key facts at a glance

LOINC
30578-9
Short code
CT Guided Absc drain+cath place
Synonyms
CT Guided Absc 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 healthcare provider may order this test if you have symptoms of kidney issues, such as swelling, fatigue, or changes in urine output. It can also be used to monitor kidney function in people with chronic conditions like diabetes or high blood pressure.

What to Expect Before the Test

No special preparation is needed. You’ll provide a urine sample, typically collected over a 24-hour period, depending on the clinical need. Ensure you’re hydrated but avoid excessive fluid intake that might dilute the sample.

What to Expect During the Test

You’ll likely collect urine in a container over a set time (e.g., 24 hours) or provide a single sample. The sample is then sent to a lab for analysis.

What the Results Mean

Higher-than-normal levels may indicate kidney problems, while lower levels might suggest dehydration or other conditions. Your results will be interpreted by your healthcare provider in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Urine cystatin C is useful for detecting kidney dysfunction, especially in people with conditions that affect kidney filtration. It can also help monitor kidney disease progression or response to treatment. Unlike traditional kidney function tests, it may be less affected by hydration status.

Short name

Urine Cystatin C

Frequently asked questions

How often should I get this test?
Your doctor will determine the frequency based on your health needs. It may be done periodically if you have chronic kidney disease or other conditions requiring kidney monitoring.
What causes high or low urine cystatin C levels?
High levels may signal kidney damage, infection, or dehydration. Low levels can occur with dehydration or certain medications. Always discuss symptoms or concerns with your healthcare provider.
Can I drink fluids before the test?
Yes, but avoid excessive fluid intake that might dilute the sample. Follow your healthcare provider’s instructions for the specific test protocol.
  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