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Serum Creatinine Concentration (Qualitative or Quantitative)

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

["Kidney function depends on this test to check how well your kidneys remove waste."]

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

Key facts at a glance

LOINC
38282-0
Short code
LPT 4.83 ug/mL TT Bld-aCnc
Synonyms
LPT 4.83 ug/mL TT Bld-aCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
4.5
Ref high
12
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85610
SNOMED
396252006
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test to monitor kidney health, especially if you have conditions like diabetes, high blood pressure, or a history of kidney problems. It can also be used to evaluate kidney function before certain treatments or surgeries.

What Does a High or Low Level Mean?

High levels may indicate kidney damage or disease, while very low levels could suggest muscle disorders or certain metabolic conditions. Your results will be compared to standard reference ranges provided by your healthcare provider.

How Is This Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where creatinine levels are measured using a specialized test, often an enzymatic method.

What Should You Do Before the Test?

Avoid strenuous exercise or eating a very high-protein meal 24 hours before the test. Stay hydrated unless advised otherwise by your doctor.

Reference range

Adult: 4.5-12.0 μg/dLN/A

Specimen: whole-blood

Take your thyroid medication after the blood draw if applicable. No fasting required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Creatinine Level (Serum)

Frequently asked questions

What if I Have Kidney Problems?
If you have known kidney issues, your doctor may recommend regular monitoring of creatinine levels to track changes in kidney function over time.
Will I Feel Any Pain or Discomfort?
You may feel a slight pinch when the needle is inserted, but the procedure is usually quick and painless. Most people experience minimal discomfort afterward.
How Long Until I Get Results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Your doctor will discuss the findings with you during your follow-up visit.
  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