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Lactate in Blood (Concentration) – Serum or Plasma

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

This test measures the amount of lactate, a byproduct of energy production in your body, typically drawn from blood.

Quick summary

["Lactate helps assess how well your body is using oxygen and can signal potential health issues like low oxygen levels or metabolic problems."]

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

Key facts at a glance

LOINC
2518-9
Short code
Lactate BldA-sCnc
Synonyms
Lactate BldA-sCnc
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 It’s Done

Doctors may order a lactate test to check for conditions like low blood oxygen (hypoxia), heart or lung problems, severe infections, or metabolic disorders. It’s also used during surgeries or critical care to monitor how well your body is responding to treatment.

What to Expect Before the Test

No special preparation is needed, but you may fast for 8–12 hours before the test if instructed. Tell your doctor about any medications, supplements, or recent illnesses that could affect results.

How the Test Works

A blood sample is taken from a vein (usually in your arm) and sent to a lab. The lab measures lactate concentration using a specialized method, often an enzymatic assay that detects its presence in the sample.

Possible Results and Interpretation

Results are compared to a general reference range, but individual ranges can vary by lab. High lactate levels may indicate poor oxygen delivery or metabolic stress, while low levels might suggest overuse of oxygen or certain metabolic conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Lactate Level

Frequently asked questions

What might cause elevated lactate levels?
Elevated lactate can result from conditions like heart failure, severe infections, shock, or severe exercise. It may also appear in people with liver or kidney problems, diabetes, or certain blood disorders. Always discuss results with your healthcare provider.
How do I know if my results are abnormal?
Your doctor will interpret your results in the context of your symptoms, medical history, and other tests. Abnormal results may trigger further testing or adjustments to your treatment plan.
Can lifestyle changes affect this test?
Yes, factors like fasting, exercise, dehydration, or certain medications can influence lactate levels. Follow your doctor’s instructions for preparation to ensure 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