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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 breakdown, in your blood serum. It helps assess how well your kidneys are filtering blood.

Quick summary

["Kidney function check with a simple blood test."]

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

Key facts at a glance

LOINC
72955-8
Short code
Sertraline (neut) IgM SerPl Ql FC
Synonyms
Sertraline (neut) IgM SerPl Ql FC
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
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 doctor may order this test to evaluate kidney function, monitor chronic kidney disease, check for dehydration, or assess conditions affecting muscle metabolism. It’s also used before certain medications or procedures to ensure your kidneys are functioning properly.

What Does a High or Low Result Mean?

High levels may indicate kidney problems, poor kidney function, or conditions like dehydration or muscle disorders. Low levels are less common but could suggest overhydration or certain metabolic conditions.

How Is This Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The sample is sent to a lab where it’s analyzed to measure creatinine concentration using a specialized method.

What Are Common Causes of Abnormal Results?

Changes in creatinine levels can be influenced by factors like muscle mass, hydration status, diet, or certain medications. Kidney disease, heart failure, or severe infections may also alter results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is a key marker for kidney function and is used alongside other tests (like blood urea nitrogen) to diagnose and monitor kidney conditions. It helps doctors track how well kidneys are removing waste from your blood over time.

Short name

Serum Creatinine

Frequently asked questions

Will I feel pain or discomfort during the blood draw?
You may feel a slight pinch or sting when the needle is inserted, but most people describe it as brief and manageable. Afterward, there may be a small bruise or slight discomfort at the site.
How soon will I get my results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your doctor will discuss them with you during your follow-up visit.
Can I eat or drink before this test?
You can eat and drink normally before this test unless your doctor specifies otherwise. Fasting is not required for creatinine testing.
  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