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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. It helps assess kidney function.

Quick summary

["A creatinine test helps doctors check how well your kidneys are working."]

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

Key facts at a glance

LOINC
33395-5
Short code
EBV VCA Ab Ser Ql
Synonyms
EBV VCA Ab Ser 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 Is This Test Done?

Your doctor may order a creatinine test to monitor kidney health, especially if you have symptoms like swelling, fatigue, or changes in urine output. It’s also used to evaluate kidney disease, dehydration, or to adjust medications that affect kidney function.

What to Expect During the Test

A small blood sample is taken from a vein, usually in your arm. You may feel a slight pinch, but it’s quick and painless. No special preparation is needed unless your doctor instructs otherwise.

Factors That Can Affect Results

Several factors, such as recent exercise, dehydration, or certain medications, can temporarily change creatinine levels. Your doctor will consider these when interpreting your results.

What the Results Mean

While creatinine levels alone don’t give a full picture of kidney function, they’re part of a broader assessment. High levels may indicate reduced kidney function, while very low levels could suggest muscle loss or other conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Kidney Function and Health

Short name

Creatinine

Frequently asked questions

How often will I need this test?
Your doctor will determine how often you need this test based on your health condition, medications, and overall kidney function. Regular monitoring may be needed if you have chronic kidney disease or take medications that affect the kidneys.
What if my results are outside the normal range?
If your creatinine levels are higher than expected, your doctor may investigate further to check for kidney issues or other health problems. If levels are lower, they might look for causes like muscle loss or dehydration.
Can I eat or drink anything before this test?
No special diet or fasting is required for this test, but always follow your doctor’s instructions. If you have questions about timing, ask your lab or doctor.
  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