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Serum or Plasma Creatinine Concentration (Qualitative or Quantitative)

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

This test measures the amount of creatinine, a waste product from muscle metabolism, in your blood or plasma. It helps assess kidney function.

Quick summary

["Kidney function depends on how well your kidneys filter waste like creatinine."]

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

Key facts at a glance

LOINC
5145-8
Short code
ECV6 Ab Titr Ser CF
Synonyms
ECV6 Ab Titr Ser CF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
comp-fix
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 check how well your kidneys are working. High levels can signal kidney problems, while low levels might indicate dehydration or muscle breakdown. It’s often used alongside other tests to diagnose or monitor conditions like chronic kidney disease, kidney stones, or certain medical treatments.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or vein to draw blood. If a urine sample is involved, you might be asked to collect it over a 24-hour period. Avoid strenuous activity or excessive fluid intake 24 hours before if instructed.

What the Results Mean

Results are compared to a reference range, but exact values depend on the lab. High creatinine levels may suggest poor kidney function, while very low levels could indicate issues like severe dehydration or muscle disorders. Your doctor will interpret results in the context of your overall health.

Common Conditions Linked to Creatinine Levels

Elevated creatinine levels are often linked to kidney disease, high blood pressure, or diabetes. Low levels may be seen in dehydration, severe muscle loss, or certain liver/kidney disorders. Always discuss results with your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

None

Frequently asked questions

Will my creatinine levels change with diet?
Yes, diet can affect creatinine levels. High-protein foods or dehydration may temporarily raise levels, while proper hydration helps maintain normal kidney function. Always follow your doctor’s advice on dietary adjustments.
Can I take my own blood for this test?
No, you should only have your blood drawn by a trained healthcare professional to ensure accuracy and safety. Self-collection may lead to errors or infections.
How often should I get this test?
Frequency depends on your health. Doctors may recommend regular testing for kidney disease, chronic conditions, or if you’re on medications that affect kidneys. Follow your provider’s schedule.
  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