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Serum/Plasma Creatinine Concentration (Standard Method)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of creatinine, a waste product from muscle breakdown, 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
23969-9
Short code
ECV7 Ab Titr CSF
Synonyms
ECV7 Ab Titr CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Matters

Your kidneys normally filter waste products, including creatinine, from your blood. High levels may indicate kidney problems or reduced kidney function. Low levels could suggest overhydration or muscle breakdown.

What to Expect Before the Test

No special preparation is needed unless instructed by your doctor. You may be asked to fast or avoid certain medications, but this will be specified. Bring any recent medications or allergies to your appointment.

What Happens During the Test

A healthcare provider will draw blood from a vein in your arm. The process is quick and usually causes only minor discomfort. The blood sample is sent to a lab for analysis.

What the Results Mean

Results are compared to a reference range that varies by lab. Elevated levels may signal kidney issues, while very low levels might need further investigation for other causes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Creatinine

Frequently asked questions

What causes elevated creatinine levels?
Elevated creatinine levels can result from kidney disease, dehydration, severe muscle injury, or conditions that impair blood flow to the kidneys. Chronic kidney disease, diabetes, or heart failure may also contribute.
What causes low creatinine levels?
Low creatinine levels can occur with overhydration, muscle atrophy, liver disease, or certain medications that affect muscle metabolism. It’s important to discuss symptoms like fatigue or swelling with your doctor.
How often should creatinine levels be checked?
Your doctor may recommend regular creatinine checks if you have kidney disease, diabetes, heart conditions, or if you’re taking medications that affect kidney function. Follow-up tests are often scheduled based on your overall health and symptoms.
  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