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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 blood.

Quick summary

["A creatinine test helps check kidney function by measuring how well your kidneys remove waste from your blood."]

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

Key facts at a glance

LOINC
98016-9
Short code
Fat #/area UrnS HPF
Synonyms
Fat #/area UrnS HPF
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light-hpf
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test to monitor kidney health, especially if you have conditions like diabetes, high blood pressure, or a history of kidney problems. It can also be used to check for kidney disease progression or guide treatment decisions.

What Does a High or Low Level Mean?

High levels may indicate kidney damage or disease, while low levels could suggest muscle disorders or other health issues. However, results alone don’t diagnose a condition—your provider will consider your overall health and symptoms.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause discomfort. The sample is sent to a lab for analysis.

What Should You Do Before the Test?

Avoid strenuous exercise or heavy meals 12–24 hours before the test. If you’re on certain medications (like NSAIDs), let your provider know, as they may affect results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Creatinine

Frequently asked questions

How often should I get this test?
Your provider will determine the frequency based on your health needs. Regular monitoring may be recommended if you have kidney-related conditions or risk factors.
Can diet affect my creatinine levels?
Dietary protein intake can influence creatinine levels, but the impact is usually small. High-protein diets may slightly raise levels, while very low-protein diets may lower them. Focus on overall kidney health rather than just this test.
What if my results are abnormal?
If your results are outside expected ranges, your provider will discuss next steps, which may include further testing, lifestyle changes, or adjustments to medications.
  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