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Serum/plasma lactate concentration (quantitative)

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. It helps doctors assess how well your body is using oxygen and managing energy.

Quick summary

["Lactate levels can indicate poor oxygen flow or metabolic issues."]

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

Key facts at a glance

LOINC
57364-2
Short code
Lactate 1h p chal SerPl-mCnc
Synonyms
Lactate 1h p chal SerPl-mCnc
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 a lactate test to check for conditions like low blood oxygen (hypoxia), severe infections, heart or lung problems, or complications from shock or surgery. It can also help monitor people with certain diseases like heart failure or kidney problems.

What Does the Test Involve?

A small blood sample is taken from your arm, usually by a needle. The blood is then sent to a lab to measure lactate levels using a specialized method.

What to Expect Before the Test

No special preparation is needed, but let your doctor know if you’re taking any medications or have recent injuries, infections, or conditions that might affect results.

What to Expect After the Test

You may feel a slight bruise or soreness at the needle site, but this usually goes away quickly. Avoid vigorous activity for a few hours afterward.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lactate Level

Frequently asked questions

How is lactate measured?
Lactate is measured in your blood plasma or serum using a method called enzymatic analysis, which detects the chemical reactions involving lactate.
What are the typical reference ranges?
Reference ranges vary by lab and patient factors, so your results will be compared to your specific lab’s standards. Normal values are usually between 0.5 and 2.0 mmol/L in adults, but this can differ.
Can lifestyle changes affect my lactate levels?
Yes, physical activity, diet, and hydration can influence lactate levels. High-intensity exercise or dehydration may temporarily raise them, so it’s important to follow your doctor’s instructions for fasting or activity before testing.
  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