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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 how well your kidneys are filtering blood.

Quick summary

["A creatinine test helps check kidney function and detect early kidney problems."]

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

Key facts at a glance

LOINC
109013-3
Short code
ENA Scl70 IgG Msmt Ser
Synonyms
ENA Scl70 IgG Msmt Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 healthcare provider may order this test to evaluate kidney health, monitor kidney disease progression, or assess kidney function before certain procedures or medications. It can also help diagnose conditions like chronic kidney disease or acute kidney injury.

What Does a High or Low Level Mean?

High levels may indicate poor kidney function, dehydration, or conditions like muscle disorders. Low levels could suggest overhydration, liver disease, or certain genetic conditions.

How Is the Sample Collected?

A blood sample is drawn from a vein, usually in your arm. The blood is then separated into serum (liquid part after clotting) or plasma (liquid part after centrifugation).

What Are Common Uses?

This test is commonly used alongside other kidney function tests (like blood urea nitrogen or glomerular filtration rate) to diagnose and monitor kidney disease. It’s also useful in evaluating patients with symptoms like fatigue, swelling, or changes in urine output.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Creatinine Level (Serum/Plasma)

Frequently asked questions

What preparation is needed before the test?
No special preparation is usually required, but you may be asked to avoid certain medications (like NSAIDs) that could affect kidney function. Your provider will give specific instructions if needed.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Follow up with your healthcare provider for interpretation.
Can I fast before this test?
Fasting is generally not required for a creatinine test, but your provider may recommend it if combined with other blood tests (like glucose or lipids). Always check with your provider for guidance.
  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