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Serum Lactate 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 doctors assess how well your body is using oxygen and managing energy during activity or illness."]

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

Key facts at a glance

LOINC
14045-9
Short code
D-Lactate SerPl-sCnc
Synonyms
D-Lactate 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?

Doctors may order this test to check for conditions affecting oxygen use, such as heart problems, severe infections, or low blood sugar. It can also help monitor people with certain medical devices like ventilators or those recovering from surgery.

When Might You Need This Test?

You might need this test if you have symptoms like rapid breathing, confusion, or weakness, especially after exercise, illness, or during treatments like chemotherapy or dialysis.

What Does a High or Low Level Mean?

High lactate levels can indicate poor oxygen flow to tissues, which may happen in heart or lung issues, shock, or severe infections. Low levels might suggest conditions like low blood sugar or certain metabolic disorders.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure lactate concentration using a specialized method.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lactate Level

Frequently asked questions

What are the normal results for this test?
Normal results vary by lab and individual, but typical reference ranges for serum lactate are usually between 0.5 and 2.0 mmol/L. Your doctor will compare your results to your specific baseline and health status.
How long does it take to get results?
Results are usually available within 24 hours, depending on lab processing times. Your doctor will discuss the findings with you during your follow-up visit.
Can lifestyle changes affect this test?
Yes, physical activity, diet, and hydration can influence lactate levels. Avoid intense exercise or fasting before the test if instructed by your doctor to get 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