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Serum 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 serum. It helps assess kidney function.

Quick summary

["A creatinine test helps check how well your kidneys are filtering blood."]

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

Key facts at a glance

LOINC
104735-6
Short code
FLUBV RNA Spec Ql
Synonyms
FLUBV RNA 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
Method
molgen
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 Is This Test Done?

Your doctor may order this test to evaluate kidney health, monitor chronic kidney disease, check for dehydration, or assess muscle disorders. It’s often used alongside other tests like blood urea nitrogen (BUN) to diagnose or monitor kidney function.

What to Expect Before the Test

No special preparation is needed, but you may be asked to avoid certain medications (like NSAIDs) or foods high in potassium if your doctor has specific instructions. Drink plenty of water the day before if you’re dehydrated.

What Happens During the Test?

A blood sample is drawn from a vein, usually in your arm. The process is quick and typically painless. The sample is sent to a lab for analysis.

What the Results Mean

Higher-than-normal levels may indicate kidney problems, muscle disorders, or dehydration. Lower-than-normal levels could suggest liver disease, malnutrition, or overhydration. Your doctor will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Kidney Function and Disease Monitoring

Short name

Creatinine

Frequently asked questions

Creatinine levels are a key marker for kidney function because they reflect how well your kidneys filter waste from your blood. Chronic kidney disease, diabetes, or high blood pressure can raise creatinine levels over time, so regular monitoring is important for early detection and management.
This test alone doesn’t diagnose kidney disease but is often used alongside other tests (like urine protein or BUN) to assess kidney health. Your doctor may also consider your age, sex, and overall health when interpreting results.
What causes creatinine levels to rise?
Creatinine levels can rise due to kidney problems (such as chronic kidney disease), dehydration, muscle disorders, or certain medications. Conditions like heart failure or severe infections may also affect levels, but your doctor will consider all factors when evaluating your results.
How often should I get this test?
Your doctor will determine how often you need this test based on your health condition. For example, people with kidney disease may need it more frequently, while others with stable health may only need it occasionally or as needed for monitoring.
  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