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Serum or Plasma Mass Concentration of Creatinine

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
57495-4
Short code
11DC Pre Dex SerPl-mCnc
Synonyms
11DC Pre Dex SerPl-mCnc
Category
hormone
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 Is Done

Your doctor 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, track kidney function over time, or guide treatment decisions for certain medications.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into your arm or a blood sample drawn from a vein. If you’re taking certain medications, discuss them with your doctor before the test.

What the Results Mean

Higher than expected levels may indicate poor kidney function or damage, while lower levels could suggest overhydration or other conditions. Your doctor will interpret results in relation to your overall health and medical history.

Common Conditions Monitored

This test is often used alongside other kidney function tests (like blood urea nitrogen) to diagnose or monitor conditions such as chronic kidney disease, acute kidney injury, or kidney-related side effects of medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated creatinine levels can signal reduced kidney filtration, which may require lifestyle adjustments, medication changes, or further testing. Low levels alone may not be concerning but should be evaluated in context with other health factors.

Short name

Creatinine Level

Frequently asked questions

What causes creatinine levels to be higher than usual?
Higher creatinine levels can result from dehydration, muscle damage, certain medications, or kidney disease. If you notice unexplained fatigue, swelling, or changes in urine, discuss these symptoms with your doctor.
How often should I get this test?
Your doctor will determine the frequency based on your health needs. Regular monitoring may be recommended if you have kidney-related conditions, diabetes, or high blood pressure.
Can diet affect creatinine levels?
Dietary changes like high-protein intake may temporarily affect creatinine levels, but your doctor will consider overall health trends rather than short-term fluctuations.
  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