Skip to content

Lactate (Serum) Concentration

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

This test measures the amount of lactate, a byproduct of energy production in your body, in your blood serum.

Quick summary

["Lactate levels help assess how well your body is using oxygen and managing energy during stress or illness."]

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

Key facts at a glance

LOINC
29815-8
Short code
LACV IgG Ser Ql IF
Synonyms
LACV IgG Ser Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
CPT
82784
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 This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like rapid breathing, confusion, or low blood pressure, which can occur when your body isn’t getting enough oxygen. It’s also used to monitor conditions like heart attacks, severe infections, or during surgery to check how your body is responding to stress.

When to Expect Results

Results are typically available within 1 to 24 hours, depending on your lab’s processing schedule. Your provider will discuss the results with you during your follow-up visit.

What to Expect During the Test

A small needle will be inserted into your arm to draw blood. You may feel a brief pinch, but it usually doesn’t cause significant discomfort. The process takes just a few minutes.

Factors That Can Affect Results

Lactate levels can be influenced by recent exercise, dehydration, or certain medications. If you’ve had recent physical activity or consumed alcohol, let your provider know so they can interpret the results accurately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Lactate

Frequently asked questions

What does a high lactate level mean?
A high lactate level often signals that your body isn’t getting enough oxygen, which can happen during severe illness, heart problems, or during surgery. It may also indicate conditions like sepsis or metabolic disorders.
How is lactate tested?
Lactate is measured in your blood serum using an enzymatic method, which detects the presence of lactate by analyzing its chemical reactions.
Can I eat or drink before this test?
You can usually eat and drink normally before this test unless your provider has specific instructions. However, if you’re fasting for another reason, follow their guidance.
  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