Skip to content

Plasma Creatinine Concentration (Mass Concentration)

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of creatinine, a waste product from muscle metabolism, in your blood plasma. It helps assess kidney function.

Quick summary

["Kidney function check with a simple blood test."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
47913-9
Short code
GH 30M p Orn SerPl-aCnc
Synonyms
GH 30M p Orn SerPl-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
17
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 Is This Test Done?

Your doctor may order this test to evaluate kidney health, monitor chronic conditions like diabetes or heart disease, or check for kidney problems before certain procedures. High levels may suggest kidney damage, while low levels could indicate dehydration or muscle disorders.

What to Expect Before the Test

No special preparation is usually needed. You may fast for 8–12 hours before the test if instructed, but this is not always required. Drink plenty of water the day before to ensure accurate results.

What Happens During the Test?

A healthcare provider will draw blood from a vein in your arm using a small needle. You may feel a brief pinch, but it’s over quickly. The test takes just a few minutes.

What Does the Result Mean?

Results are compared to a general reference range, but your actual values may vary slightly based on lab methods. High creatinine levels may signal impaired kidney function, while very low levels could indicate dehydration or muscle breakdown. Your doctor will interpret results in the context of your overall health.

Reference range

NCBI: NSE 0-17 ng/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Creatinine Level

Frequently asked questions

What could cause elevated creatinine levels?
Elevated creatinine levels often point to reduced kidney function, but other factors like dehydration, muscle injury, or certain medications can also raise it. Chronic kidney disease, heart failure, or severe infections may also contribute.
What could cause low creatinine levels?
Low creatinine levels may occur if you’re dehydrated, have very little muscle mass, or take certain medications that affect kidney function. Rarely, it could indicate a metabolic disorder, but this is less common.
How often should I get this test?
Your doctor will determine how often you need this test based on your health condition. For example, people with diabetes or heart disease may get it more frequently, while others may only need it occasionally.
  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 17, 2026. · Read our editorial policy