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Serum or Plasma Creatinine and Uric Acid Ratio (CUA Ratio)

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

This test measures the ratio of creatinine and uric acid in your blood. It helps assess kidney function and potential metabolic or fluid balance issues.

Quick summary

["A CUA ratio may indicate kidney health or fluid/chemical imbalances."]

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

Key facts at a glance

LOINC
31893-1
Short code
MuV Ag Penis Ql
Synonyms
MuV Ag Penis Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 CUA Ratio Used For?

Doctors may use the CUA ratio to evaluate kidney function, especially in patients with suspected dehydration, heart disease, or metabolic disorders. It can also help identify conditions affecting fluid balance or electrolyte levels, such as certain kidney diseases or metabolic acidosis.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The sample is sent to a lab where creatinine and uric acid levels are measured separately, and their ratio is calculated.

What Does a CUA Ratio Tell You About My Health?

While a single CUA ratio result isn’t diagnostic on its own, it can provide clues about kidney function and metabolic health. Abnormal results may prompt further testing to identify underlying conditions.

How Often Should I Get This Test?

Your doctor will determine how often you need this test based on your medical history, symptoms, and overall health. Regular monitoring may be recommended if you have kidney disease, heart conditions, or other risk factors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CUA Ratio

Frequently asked questions

Why might my doctor order a CUA ratio test?
Your doctor may order this test if you have symptoms like fatigue, swelling, or changes in urine output, or if you have conditions like heart disease, kidney disease, or metabolic disorders that affect fluid balance.
What are typical reference ranges for this test?
Reference ranges vary by lab and individual health. Your doctor will interpret results in the context of your overall health and medical history.
Can I eat or drink anything before this test?
Generally, you can eat and drink normally before this test unless instructed otherwise by your doctor. Some tests may have specific fasting requirements, but this does not apply to the CUA ratio.
  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