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Serum Creatinine (Creatinine Level)

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

This test measures the amount of creatinine, a waste product from muscle metabolism, in your blood. It helps assess how well your kidneys are filtering waste.

Quick summary

["Kidney function check via blood waste product levels."]

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

Key facts at a glance

LOINC
17333-6
Short code
N men sg W135 Ag SerPl Ql LA
Synonyms
N men sg W135 Ag SerPl Ql LA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
la
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 for kidney problems, monitor kidney disease, or evaluate how well medications are being processed by your kidneys. It’s often used alongside other tests to assess overall kidney health.

What to Expect Before the Test

No special preparation is 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 currently taking to your appointment.

What Happens During the Test?

A healthcare provider will draw blood from a vein in your arm. The process is quick and usually causes only minor discomfort. The sample is sent to a lab for analysis.

What Are the Results Meaning?

Higher than expected levels may indicate reduced kidney function, while lower levels could suggest dehydration or muscle breakdown. Your doctor will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Kidney Function and Health

Short name

Creatinine

Frequently asked questions

How often should I get this test?
The frequency depends on your health status. People with kidney disease may need regular monitoring, while others may only need it if they have risk factors like diabetes or high blood pressure.
Can diet affect my creatinine levels?
Dietary changes alone won’t alter creatinine levels, but eating a balanced diet rich in lean proteins and limiting excessive salt or processed foods can support kidney health.
What if my results are abnormal?
If results are outside expected ranges, your doctor will discuss next steps, which may include further testing, lifestyle adjustments, or treatment adjustments based on your condition.
  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