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Sodium and Creatinine, Urine

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

Measures sodium and creatinine in urine to help assess kidney function, hydration, and sodium balance.

Quick summary

["This test helps evaluate kidney function and how much sodium your body is excreting in urine."]

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

Key facts at a glance

LOINC
11149-2
Short code
Sodium/Creat Ur
Synonyms
Sodium/Creat Ur
Category
kidney
Sample
urine
Container
Sterile urine container
Units
N/A
Ref low
136
Ref high
145
Critical range
120 N/A – 160 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84295
SNOMED
110741000
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is this test?

This test measures the amounts of sodium and creatinine in a urine sample. Creatinine is a waste product filtered by the kidneys, while sodium helps regulate fluid and blood pressure.

Why might I need this test?

Your clinician may use this test to assess kidney function, evaluate hydration, or monitor sodium loss or retention. It may also help interpret urine protein results.

How is the test performed?

A urine sample is collected and analyzed in a laboratory. The sample may be a single urine collection or part of a timed collection, depending on the instructions provided by your clinician.

How do I prepare for the test?

Follow your clinician's collection instructions and tell the laboratory about medicines or supplements you take. If timed urine collection is requested, record when the collection starts and ends and collect all urine during that period.

Reference range

Adult: 136-145 mmol/LN/A

Specimen: urine

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine sodium and creatinine

Frequently asked questions

Does this test diagnose kidney disease?
No. It can help assess kidney function and sodium balance, but other blood and urine tests are usually needed to diagnose a specific kidney condition.
Why are sodium and creatinine measured together?
Measuring them together helps clinicians understand sodium excretion relative to urine concentration and can provide useful context for kidney and hydration assessment.
Does eating salty food affect the result?
Yes. A high-sodium diet, dehydration, exercise, and medicines can affect urine sodium, so your clinician may interpret the result based on your circumstances.
  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