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Serum Creatinine (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

["Your kidneys filter waste from your blood; this test checks their function."]

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

Key facts at a glance

LOINC
47322-3
Short code
ENA Scl70 IgG Ser IA-aCnc
Synonyms
ENA Scl70 IgG Ser IA-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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?

Doctors may order this test to check for kidney problems, monitor kidney disease, or evaluate how well medications are being processed by your kidneys. It’s often used alongside other tests like blood urea nitrogen (BUN) to assess kidney function.

What Does a Result Mean?

Higher than expected levels may suggest kidney issues, while lower levels could indicate dehydration or muscle problems. Your doctor will interpret results in relation to your overall health and other tests.

How Is the Sample Collected?

A small blood sample is drawn from a vein, usually in your arm. You may feel a slight pinch, but it’s quick and doesn’t usually cause discomfort afterward.

What Should I Do Before the Test?

Avoid heavy exercise or strenuous activity 24 hours before the test. Stay hydrated unless your doctor advises otherwise, as dehydration can affect results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for diagnosing and monitoring kidney disease, detecting early signs of impaired kidney function, and guiding treatment plans. Abnormal results may prompt further testing or adjustments to medications to protect kidney health.

Short name

Creatinine

Frequently asked questions

Will I feel any pain or discomfort?
You may feel a slight pinch when the needle is inserted, but most people describe it as minimal. Afterward, there may be a small bruise or slight soreness, which usually goes away quickly.
How long does it take to get results?
Results are typically available within 1–3 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 the test?
You can eat and drink normally unless your doctor specifies otherwise. Avoid excessive alcohol or large meals before testing, as they may slightly affect creatinine levels.
  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