Skip to content

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
110956-0
Short code
ENA Ab Msmt Ser
Synonyms
ENA Ab Msmt Ser
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 Creatinine?

Creatinine is a byproduct of muscle breakdown that your kidneys normally filter out of your blood. High levels can indicate poor kidney function, while low levels may suggest dehydration or other conditions affecting muscle metabolism.

Why Is This Test Done?

Doctors order creatinine tests to monitor kidney health, especially in people with diabetes, high blood pressure, or a history of kidney disease. It’s also used to evaluate kidney function before certain procedures or medications.

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 panel. Drink plenty of water the day before to ensure accurate results.

What Happens During the Test

A healthcare provider will draw blood from a vein in your arm. The process is quick and usually painless. You may feel a slight pinch, but it won’t take long.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Creatinine levels help assess kidney function by measuring how well your kidneys remove waste. Elevated levels may signal kidney damage, while persistently low levels could indicate dehydration or muscle disorders.

Short name

Creatinine

Frequently asked questions

How often should I get this test?
Your doctor will determine how often you need this test based on your health history, symptoms, and overall condition. Regular monitoring may be recommended if you have kidney-related conditions or risk factors.
What does a high creatinine level mean?
A high creatinine level often suggests your kidneys aren’t working as well as they should, which could be due to kidney disease, dehydration, or other health issues. Always discuss results with your doctor.
Can diet affect creatinine levels?
Dietary changes, such as eating more protein, can temporarily affect creatinine levels. However, your doctor will consider your overall health and lifestyle when interpreting results.
  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