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Lactic acid concentration in serum/plasma

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

This test measures the amount of lactic acid in your blood, which helps doctors assess how well your body is using oxygen and removing waste products.

Quick summary

["Lactic acid levels can indicate issues with metabolism, oxygen supply, or kidney/heart function."]

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

Key facts at a glance

LOINC
14046-7
Short code
D-Lactate Ur-sCnc
Synonyms
D-Lactate Ur-sCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Critical range
— – 4 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Is Lactic Acid?

Lactic acid is a byproduct of normal metabolism when your body breaks down glucose for energy. While small amounts are harmless, elevated levels may signal problems like poor circulation, infections, or conditions affecting how your body uses oxygen.

Why Might This Test Be Ordered?

Your doctor may order this test if you have symptoms like shortness of breath, fatigue, or muscle pain, or if you have conditions like heart disease, kidney problems, or severe infections. It can also help monitor treatment for certain illnesses.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it is analyzed to measure lactic acid concentration using a specialized method.

What Do Results Mean?

Results are compared to a reference range specific to your lab. High levels may suggest conditions like lactic acidosis, heart or kidney disease, or severe dehydration. Low levels are less common but could indicate overuse of certain medications or metabolic disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Lactic Acid Levels and Health

Short name

Serum/plasma lactic acid

Frequently asked questions

Why was this test ordered for me?
Your doctor may have suspected conditions like poor circulation, infections, or metabolic disorders that could affect how your body produces or removes lactic acid. They may also be monitoring a known condition or treatment plan.
What are the normal reference ranges?
Reference ranges vary by lab and may not be publicly listed. Your results will be interpreted in the context of your specific health status and lab’s standards.
Can lifestyle changes affect this test?
Yes, factors like exercise, hydration, diet, and certain medications can influence lactic acid levels. Avoid strenuous activity or fasting before your test if instructed by your doctor.
  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