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Creatspecscnc

Published: July 31, 2026Updated: August 10, 2026

A blood test that measures creatinine levels to evaluate how well your kidneys are functioning.

Quick summary

{"Creatinine is a waste product from muscle metabolism filtered by kidneys","Elevated levels may indicate kidney dysfunction or damage","The test is commonly used alongside BUN test to assess kidney health","Normal ranges vary based on age, sex, and muscle mass","Preparation typically requires fasting and avoiding strenuous exercise"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 10, 2026Editorial policy

Key facts at a glance

LOINC
22726-4
Short code
CREA
Synonyms
Creat Spec-sCnc
Category
kidney
Sample
serum
Container
Serum separator tube (SST/gold top) or plain red top tube
Units
not specified
Ref low
53
Ref high
115
Critical range
30 not specified – 442 not specified
Fasting
false
Population
adult
Sex
all
Age range
≥ 0 years
Method
Enzymatic method (creatinine amidohydrolase) or Jaffe colorimetric method using picrate
CPT
82565
SNOMED
273967001
Specimen volume
1.0-2.0 mL serum minimum
Stability
Room temperature: 7 days, Refrigerated (2-8°C): 7 days, Frozen (-20°C or below): 30 days. Avoid repeated freeze-thaw cycles.
Hemolysis max
50
Lipemia max
300
Icterus max
25
TAT
1–24 hours
Order
routine

What is this test?

A blood creatinine test measures the amount of creatinine in your blood. Creatinine is a waste product produced naturally by your muscles during normal muscle metabolism. Your kidneys filter creatinine from your blood and eliminate it through urine. This test helps healthcare providers assess how well your kidneys are performing this filtering function.

Why is it performed?

This test is primarily ordered to evaluate kidney function. It may be recommended as part of a routine health checkup, to monitor existing kidney disease, to check for dehydration, or to assess the effects of medications that may affect kidney function. It is often performed together with a Blood Urea Nitrogen (BUN) test for a more comprehensive view of kidney health.

How to prepare

Before the test, you may need to fast (not eat or drink) for 8-12 hours. Avoid strenuous exercise for 24 hours before the test, as intense physical activity can temporarily increase creatinine levels. Inform your healthcare provider about all medications and supplements you are taking, as some drugs can affect test results.

Understanding the results

Normal creatinine levels typically range from 0.7 to 1.3 mg/dL for men and 0.6 to 1.1 mg/dL for women, though reference ranges may vary by laboratory. Higher than normal levels may suggest kidney problems, dehydration, urinary tract obstruction, or heart failure. Lower than normal levels may occur in individuals with low muscle mass, advanced age, or severe liver disease. Your healthcare provider will interpret your results based on your overall health profile.

Reference range

53-97 µmol/L (female), 62-115 µmol/L (male)not specified

Specimen: serum

No fasting or special preparation required

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Does a high creatinine level always mean kidney disease?
Not necessarily. Elevated creatinine can result from factors other than kidney disease, including dehydration, high muscle mass, certain medications, or a diet high in cooked meat. Your healthcare provider will consider these factors and may order additional tests to confirm a diagnosis.
How is this test different from a urine creatinine test?
A blood creatinine test measures creatinine in your bloodstream, indicating how well your kidneys filter waste. A urine creatinine test measures creatinine in your urine, which can help assess kidney function and detect abnormalities in urine concentration.
Can I lower my creatinine levels naturally?
While you cannot directly lower creatinine, you can support kidney health by staying well-hydrated, eating a balanced diet low in sodium and protein, avoiding nephrotoxic medications when possible, and managing underlying conditions like diabetes and hypertension. Always consult your healthcare provider before making dietary changes.
How often should I have this test?
The frequency depends on your health status. For individuals with known kidney disease or risk factors, testing may be more frequent. For routine checkups, your doctor will determine appropriate testing intervals based on your age, medical history, and risk factors.
  1. 1
    Creatinine Blood Test - MedlinePlusSource
  2. 2
    Kidney Function Tests - National Institute of Diabetes and Digestive and Kidney DiseasesSource
  3. 3
    Creatinine - Mayo Clinic LaboratoriesSource

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 10, 2026. · Read our editorial policy