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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 to assess kidney function.

Quick summary

["Helps check how well your kidneys are filtering waste from your blood."]

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

Key facts at a glance

LOINC
8024-2
Short code
SLEV Ab Ser Ql IF
Synonyms
SLEV Ab Ser Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 Creatinine?

Creatinine is a byproduct of muscle breakdown and is normally filtered out of your blood by your kidneys. Healthy kidneys remove most of it from your blood, so high levels can indicate kidney problems.

Why Might You Need This Test?

Doctors may order this test to monitor kidney health, especially if you have conditions like diabetes, high blood pressure, or a history of kidney disease. It’s also used before certain procedures or surgeries to assess kidney function.

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 larger panel. Bring any medications you’re taking to your doctor’s office.

What Happens During the Test?

A healthcare provider will draw blood from a vein in your arm. The process is quick and usually painless, though you might feel a small pinch. The blood sample is then sent to a lab for analysis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Creatinine

Frequently asked questions

What does a high creatinine level mean?
A high creatinine level often means your kidneys aren’t working as well as they should, which could signal kidney disease or damage. Your doctor will discuss this with you and may recommend further tests or adjustments to your treatment plan.
Can diet affect creatinine levels?
Dietary changes, like eating more protein or drinking less water, can temporarily affect creatinine levels. Your doctor will consider your overall health and lifestyle when interpreting results.
How often should I get this test?
Your doctor will determine how often you need this test based on your health condition, medical history, and other factors. Regular follow-ups may be needed if you have kidney-related issues or risk factors.
  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