Skip to content

Serum Creatinine (Creatinine)

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

This test measures the level of creatinine, a waste product from muscle breakdown, in your blood to assess kidney function.

Quick summary

["Your kidneys filter waste from blood; this test helps check how well they’re working."]

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

Key facts at a glance

LOINC
109822-7
Short code
VZV DNA Msmt CSF
Synonyms
VZV DNA Msmt CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Doctors may order this test to monitor kidney health, especially if you have symptoms like swelling, fatigue, or a history of kidney disease. It’s also used before certain procedures or treatments that could affect kidney function.

What Does a Result Mean?

Higher than expected levels may suggest kidney problems, while very low levels could indicate muscle disorders or dehydration. Your doctor will interpret results in relation to your overall health.

How Is This Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab for analysis. Results are typically ready within 24 hours.

What Can Affect Results?

Factors like muscle mass, hydration status, diet, and certain medications can influence creatinine levels. Recent exercise or dehydration may temporarily alter results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Creatinine

Frequently asked questions

What causes creatinine levels to be too high?
High creatinine levels may indicate reduced kidney function, severe dehydration, or conditions that increase muscle breakdown (e.g., rhabdomyolysis). Chronic kidney disease or kidney damage from illness or injury can also lead to elevated levels.
What if my creatinine level is low?
Low creatinine levels might suggest dehydration, muscle wasting, or certain genetic conditions. Very low levels can sometimes indicate overhydration or rare metabolic disorders, though this is less common.
How often should I get this test?
Your doctor will determine how often you need this test based on your health history, symptoms, and treatment plan. Regular monitoring may be recommended if you have kidney disease, diabetes, or other conditions affecting kidney function.
  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