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Serum Creatinine Concentration (Mass)

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

This test measures the amount of creatinine, a waste product from muscle metabolism, in your blood serum. It helps assess kidney function.

Quick summary

["Kidney health depends on filtering waste like creatinine; abnormal levels may signal kidney issues."]

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

Key facts at a glance

LOINC
39610-1
Short code
N men sg W135 Ab Ser-mCnc
Synonyms
N men sg W135 Ab Ser-mCnc
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

Why Is This Test Done?

Your doctor may order this test to check if your kidneys are working properly, especially if you have symptoms like swelling, fatigue, or changes in urine output. It’s also used to monitor kidney function before certain treatments or during chronic conditions like diabetes or high blood pressure.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it’s part of a broader metabolic panel. Bring any medications you’re taking, as some can affect results.

What Happens During the Test?

A healthcare provider will draw blood from a vein in your arm. You may feel a slight pinch, but it’s quick and usually painless. The blood sample is sent to a lab for analysis.

What Are Normal Results?

Results are not provided with specific numeric ranges here, as they vary by lab and individual health. Your doctor will compare your result to your baseline and clinical picture.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

High creatinine levels may indicate poor kidney function, while low levels could suggest dehydration or overhydration. Repeatedly abnormal results warrant further evaluation, including kidney imaging or additional tests, to identify causes like kidney disease, heart failure, or other conditions.

Short name

Creatinine Level

Frequently asked questions

How often should I get this test?
Your doctor will determine how often you need this test based on your health status, symptoms, and any ongoing conditions. Follow their guidance—do not schedule it without their approval.
Does diet affect this test?
Yes, high-protein foods or dehydration can temporarily raise creatinine levels. Avoid excessive protein intake 24 hours before testing and stay hydrated unless advised otherwise.
What if my result is different from last time?
Changes in results may signal kidney strain, medication effects, or other factors. Discuss any shifts with your doctor to explore possible causes and next steps.
  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