Serum Creatinine Concentration (Standard Method)
This test measures the amount of creatinine, a waste product from muscle metabolism, in your blood serum. It helps assess kidney function by checking how well your kidneys filter blood.
["Kidney function and waste removal depend on this test."]
Key facts at a glance
- LOINC
- 10568-4
- Short code
- Clarity Smn
- Synonyms
- Clarity Smn
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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
Creatinine levels can indicate how well your kidneys are working. High levels may suggest kidney damage or disease, while low levels could signal dehydration or other conditions affecting kidney function. Your doctor may order this test to monitor kidney health before or after treatments, during pregnancy, or if you have symptoms like swelling, fatigue, or changes in urine output.
What to Expect Before the Test
No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. If you’re on a low-protein diet or have had recent muscle activity, your doctor may advise adjustments to avoid temporary fluctuations in creatinine levels.
What the Results Mean
Results are compared to a general reference range to assess kidney function. While exact values vary by lab, consistently high or low levels may prompt further testing or adjustments to your care plan.
Common Causes of Abnormal Results
High creatinine levels may result from kidney disease, dehydration, severe muscle damage, or conditions like heart failure or diabetes. Low levels can occur with dehydration, liver disease, or certain medications. Your doctor will discuss these findings with you based on your medical history and symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated creatinine is a key marker for kidney function decline and often appears before other symptoms like swelling or changes in urine. Regular monitoring helps detect kidney issues early, allowing for timely interventions. Doctors may use creatinine alongside other tests (like blood urea nitrogen) to diagnose or manage kidney disease.
Short name
Creatinine (Serum)
Frequently asked questions
How often should I get this test?
What can I do to help my kidneys?
Does diet affect creatinine levels?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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