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Lactic Acid Concentration in Serum or Plasma

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

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

Quick summary

["Lactic acid levels can signal potential issues with oxygen delivery or metabolism."]

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

Key facts at a glance

LOINC
74436-7
Short code
D-Lactate Stl-sCnt
Synonyms
D-Lactate Stl-sCnt
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Critical range
— – 4 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like shortness of breath, fatigue, or unusual muscle pain, especially after physical activity or illness. It may also be used to monitor conditions like heart problems, kidney disease, or metabolic disorders.

When to Expect Results

Results are typically available within 1 to 3 business days, depending on your lab’s processing schedule. Follow-up with your provider to discuss any findings.

What to Expect During the Test

A small blood sample is drawn from a vein, usually in your arm. You may feel a slight pinch, but it usually doesn’t cause significant discomfort. No special preparation is needed.

Common Causes of Abnormal Results

High lactic acid levels can occur due to conditions like low oxygen (hypoxia), heart or lung problems, severe infections, or certain medications. Low levels may indicate dehydration, severe illness, or metabolic issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lactic Acid

Frequently asked questions

How is lactic acid tested?
This test uses a blood sample (serum or plasma) and measures lactic acid concentration through an enzymatic method, which detects the chemical reactions involved in its breakdown.
What does a normal result mean?
A normal result doesn’t guarantee you’re healthy, but it suggests your body is processing lactic acid efficiently. Your provider will review it alongside other tests and symptoms.
Can lifestyle changes affect lactic acid levels?
Yes, factors like exercise intensity, hydration, and certain medications can influence lactic acid. Avoiding strenuous activity before testing may help provide more accurate results.
  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