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Serum Lactate Concentration

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

Lactate is a simple sugar produced when your body breaks down carbohydrates for energy. This test measures how much lactate is in your blood.

Quick summary

["Lactate helps your body produce energy quickly during times of high activity or stress."]

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

Key facts at a glance

LOINC
30241-4
Short code
Lactate BldV-mCnc
Synonyms
Lactate BldV-mCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Critical range
— – 4 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test to check for conditions that affect how well your body uses oxygen, such as heart problems, severe infections, or low blood sugar. It can also help monitor people with certain illnesses, like sepsis or heart failure, to see how their bodies are responding to treatment.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or hand to draw blood. It usually takes a few minutes, and you may feel a slight pinch or sting.

What the Test Results Mean

Higher-than-normal levels might suggest your body isn’t getting enough oxygen, or you could have an infection, heart or lung problems, or other serious health issues. Lower-than-normal levels might indicate conditions like severe dehydration or certain metabolic disorders.

Common Conditions Monitored

Doctors often use this test to monitor people with conditions like heart disease, stroke, severe infections, or during surgery to ensure they’re receiving enough oxygen and support.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Lactate levels can rise in situations where your body needs more energy quickly, such as during intense exercise, shock, or severe illness. High levels can indicate poor oxygen delivery to tissues or metabolic disturbances. Doctors use these results to guide treatment, especially in critical care settings.

Short name

Lactate Level

Frequently asked questions

What causes lactate levels to be checked regularly?
Regular checks may be done in hospital settings for patients with critical illnesses, during surgery, or for people with chronic conditions like heart disease or diabetes.
Are there any risks or side effects from this test?
The most common side effect is a small bruise or slight pain at the injection site. Rarely, there could be a reaction to the needle or infection at the site.
Can lifestyle changes affect lactate levels?
Yes, physical activity, diet, and hydration can influence lactate levels. High-intensity exercise can temporarily raise them, while dehydration or poor nutrition may affect overall metabolic function.
  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