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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 metabolism, in your blood. 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
68932-3
Short code
SIgA Tear-mCnc
Synonyms
SIgA Tear-mCnc
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 This Test Matters

Your kidneys filter waste products, including creatinine, from your blood. High levels may signal kidney problems, while low levels could indicate muscle breakdown or other conditions. This test is often used alongside other kidney function tests to diagnose or monitor kidney disease.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if it’s part of a larger panel. Drink plenty of water the day before to help your kidneys process waste normally.

How the Test Works

A blood sample is taken from a vein, usually in your arm. The lab then measures the creatinine concentration using a specialized method to determine how well your kidneys are working.

Common Causes of Abnormal Results

Elevated creatinine levels may occur with kidney disease, dehydration, or severe muscle damage. Low levels might suggest kidney failure, overhydration, or conditions affecting muscle protein breakdown.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Creatinine levels are a key indicator of kidney function. Chronic kidney disease is often detected early through consistent monitoring of creatinine and other kidney markers. High levels can prompt further testing to identify causes like diabetes, hypertension, or infections.

Short name

Creatinine Level

Frequently asked questions

How often should I get this test?
Your doctor will determine how often you need this test based on your health history, symptoms, and other tests. For example, people with diabetes or kidney disease may need it more frequently.
What does a ‘normal’ range mean?
There’s no single ‘normal’ range for everyone—it depends on your age, sex, and overall health. Your doctor will compare your results to your baseline and any known conditions.
Can diet affect my creatinine levels?
Dietary protein intake can influence creatinine levels, but the test itself doesn’t measure protein directly. Staying hydrated is important, but avoid extreme changes to protein-rich foods without medical advice.
  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