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Lactate (Serum or Plasma)

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

This test measures the level of lactate, a substance produced when your body breaks down carbohydrates for energy. It can help assess how well your body is using oxygen and managing metabolism.

Quick summary

["Lactate levels can indicate poor oxygen supply or metabolic issues, especially in critical conditions like heart or lung problems."]

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

Key facts at a glance

LOINC
29875-2
Short code
Lactate Ur Ql
Synonyms
Lactate Ur Ql
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

Why Is This Test Done?

Doctors may order lactate tests to check for conditions affecting oxygen delivery, such as heart failure, shock, or severe infections. It’s also used during surgeries or emergencies to monitor how well your body is handling stress.

What Does a High or Low Level Mean?

High lactate levels may suggest your body isn’t getting enough oxygen (like in heart or lung issues) or that your organs aren’t working properly. Low levels might indicate overuse of oxygen or certain metabolic disorders.

Common Conditions Monitored

Lactate tests are often done in hospital settings to track conditions like sepsis, heart attacks, or severe dehydration. They help doctors adjust treatments quickly.

What to Expect Before the Test

No special preparation is needed unless your doctor specifies. A blood sample is taken from a vein, usually in your arm. It may feel mild discomfort, but it’s quick and painless.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lactate

Frequently asked questions

How often is a lactate test done?
Lactate tests are typically done as part of a quick blood check, often multiple times during hospital stays for critical conditions. Your doctor will let you know if repeat tests are needed.
What causes lactate levels to rise?
Lactate levels can rise due to low oxygen (hypoxia), heart or lung problems, severe infections, or conditions that slow blood flow. Stress, exercise, or certain medications may also affect it.
Can lifestyle changes affect lactate levels?
While diet and activity can influence energy metabolism, lactate levels are most affected by medical conditions or stress. Your doctor will focus on your specific health needs.
  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