Skip to content

Plasma Creatinine Concentration (Mass Concentration)

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

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

Quick summary

["A creatinine test is a key tool for evaluating kidney health and detecting early kidney problems."]

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

Key facts at a glance

LOINC
2198-0
Short code
D-ALA Plas-mCnc
Synonyms
D-ALA Plas-mCnc
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
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 if you have symptoms like swelling, fatigue, or changes in urine output. It’s also used to monitor kidney disease, track treatment progress, or check for kidney issues before certain procedures.

What to Expect Before the Test

No special preparation is needed, but you may be asked to stop certain medications (like pain relievers) that can affect results. Drink plenty of water the day before if your doctor recommends it.

How the Test Works

A small blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it’s analyzed to measure creatinine levels.

What the Results Mean

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

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Creatinine (Plasma)

Frequently asked questions

Will I feel any pain or discomfort?
You may feel a slight pinch or sting when the needle is inserted, but it usually goes away quickly. Most people experience minimal discomfort afterward.
Can I eat or drink normally before the test?
Yes, you can eat and drink as usual unless your doctor specifies otherwise. Avoiding certain medications or fluids may be advised, so check with your provider.
What if my results are outside the normal range?
If your results are abnormal, your doctor will discuss them with you and may recommend further tests or adjustments to your treatment plan. Follow-up may include monitoring kidney function over time.
  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