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Plasma Creatinine (Mass Concentration)

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

["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
77462-0
Short code
Deprecated Hind+Mid ft XR AP+Lat+Obl
Synonyms
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Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr
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 This Test Matters

Creatinine levels help doctors determine if your kidneys are working properly. High levels may indicate kidney problems, while very low levels could suggest muscle disorders or other conditions.

What to Expect Before the Test

You’ll likely have a small needle inserted into your arm or hand to draw blood. No special preparation is needed unless instructed otherwise. Avoid strenuous activity or heavy meals 2 hours before the test.

How the Results Are Used

Your doctor may compare your creatinine level to your blood pressure, protein levels, and other kidney-related tests to diagnose or monitor kidney disease, fluid balance, or muscle health.

Common Causes of Abnormal Results

Elevated creatinine levels may be due to kidney disease, dehydration, or muscle breakdown. Low levels could result from dehydration, liver disease, or certain medications. Always discuss symptoms with your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Creatinine Level

Frequently asked questions

What factors could affect my test results?
Several factors may influence your creatinine level, including dehydration or overhydration, recent exercise, muscle mass, and certain medications. Your doctor will consider these when interpreting your results alongside other health data.
How soon will I get my results?
Results are typically available within 24–72 hours, depending on your lab’s processing time. Your healthcare provider will explain them in detail during your follow-up visit.
Can I eat or drink before this test?
Standard fasting is not required for this test, but avoid heavy meals or excessive fluids 2 hours before drawing blood to ensure accurate 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