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Serum Creatinine Concentration (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 serum. It helps assess kidney function.

Quick summary

["Your kidneys filter waste like creatinine from your blood; high levels may signal kidney problems."]

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

Key facts at a glance

LOINC
41859-0
Short code
EDDP Spec Ql
Synonyms
EDDP Spec Ql
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

Why This Test Matters

Creatinine levels help doctors check how well your kidneys are working. Kidneys normally remove creatinine from your blood, so high levels can indicate reduced kidney function or disease.

What to Expect Before the Test

No special preparation is needed. You may drink water as usual, but avoid heavy meals before testing. If you’re on a low-protein diet or have kidney-related questions, ask your doctor.

Common Causes of Abnormal Results

Elevated creatinine can result from dehydration, kidney disease, or muscle breakdown. Low levels may occur with poor muscle mass or overhydration. Other factors, like certain medications, can also affect results.

What Your Results Mean

Results alone don’t diagnose kidney issues—they’re part of a bigger picture. Your doctor will compare your levels to your overall health, symptoms, and other tests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Serum Creatinine

Frequently asked questions

How long does it take to get my creatinine test results?
Results are typically ready within 1–3 business days, depending on your lab. Your doctor will contact you with findings or schedule a follow-up if needed.
Can diet affect my creatinine levels?
Yes, high-protein foods or dehydration can temporarily raise creatinine. Your doctor may recommend dietary adjustments if kidney function is monitored long-term.
What if my creatinine is higher than usual?
If elevated, your doctor may order further tests (like blood urea nitrogen or imaging) to check kidney health. Lifestyle changes (like staying hydrated) may help, but follow their guidance.
  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