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Serum Lactate Concentration (Quantitative)

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

This test measures the amount of lactate, a substance produced when your body breaks down carbohydrates for energy, in your blood.

Quick summary

["Lactate helps your body produce energy quickly, especially during intense physical activity or low oxygen conditions."]

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

Key facts at a glance

LOINC
59007-5
Short code
Lactate 5M p chal SerPl-sCnc
Synonyms
Lactate 5M p chal SerPl-sCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Critical range
— – 4 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 healthcare provider may order this test to check for conditions like low blood oxygen (hypoxia), severe infections, heart problems, or metabolic disorders. It can also help monitor how well your body is responding to treatment for conditions like shock or seizures.

When Might You Need This Test?

You might need this test if you have symptoms like rapid breathing, confusion, weakness, or if you’re recovering from surgery, a heart attack, or a severe illness. Doctors may also order it during exercise tests or to monitor people with certain genetic conditions.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the test if it’s part of a broader metabolic study. Bring any medications you’re taking to your appointment.

What Happens During the Test?

A healthcare provider will draw blood from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause much discomfort. The blood sample is then sent to a lab for analysis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lactate Level

Frequently asked questions

What does a high lactate level mean?
A high lactate level can signal that your body isn’t getting enough oxygen, which may happen during severe illness, heart or lung problems, or intense physical activity. It can also be a sign of certain infections or metabolic disorders. Your doctor will discuss your results in detail with you.
What does a low lactate level mean?
Low lactate levels can sometimes occur with certain heart conditions or metabolic issues, but they’re less common than elevated levels. Your doctor will review your overall health and other test results to understand why it happened.
How often should I get this test?
Your doctor will determine how often you need this test based on your health condition and treatment plan. Some people may need it more frequently if they have ongoing health issues like heart disease, diabetes, or severe infections.
  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