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Serum or Plasma Creatinine Concentration (Mass Concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of creatinine, a waste product from muscle breakdown, in your blood or plasma. It helps assess how well your kidneys are filtering blood.

Quick summary

["A creatinine test helps check kidney function by measuring waste in your blood."]

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

Key facts at a glance

LOINC
7752-9
Short code
Turkey BasoBnd Ab Qn
Synonyms
Turkey BasoBnd Ab Qn
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
lhr
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test to monitor kidney health, especially if you have symptoms like swelling, fatigue, or changes in urine output. It’s also used before certain procedures or medications to ensure your kidneys are functioning properly.

What to Expect Before the Test

You may be asked to fast for a few hours before the test, but this isn’t always required. Bring any medications you’re taking, as some (like pain relievers) can affect results. Avoid strenuous activity the day of the test.

What Happens During the Test?

A small blood sample is drawn from a vein in your arm. It usually takes a few minutes, and you may feel a brief pinch. The sample is sent to a lab for analysis.

What Are the Results?

Results are compared to a general reference range, but your actual values may vary based on age, sex, and overall health. High levels may indicate kidney problems, while low levels could suggest muscle loss or other conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated creatinine levels often signal impaired kidney function, as kidneys normally filter waste like creatinine from the blood. Repeatedly high levels may require further evaluation, including kidney function tests or imaging. Low levels might prompt additional checks for conditions affecting muscle metabolism or hydration status.

Short name

Creatinine

Frequently asked questions

What causes creatinine levels to be high?
High creatinine levels can be caused by reduced kidney function, dehydration, severe muscle damage, or certain medications. Chronic kidney disease is the most common reason.
What causes creatinine levels to be low?
Low creatinine levels may occur if you have very little muscle mass, severe malnutrition, or certain liver or heart conditions. They can also be affected by medications or hydration status.
How often should I get this test?
Your healthcare provider will determine how often you need this test based on your health history, symptoms, and treatment plan. Regular monitoring may be needed if you have kidney disease or take medications that affect kidney function.
  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