Serum/plasma lactate to pyruvate ratio
This test measures the ratio of lactate to pyruvate in your blood, which can help assess how well your body is converting energy during exercise or other metabolic demands.
["Understanding your body’s energy metabolism through blood chemistry ratios."]
Key facts at a glance
- LOINC
- 101656-7
- Short code
- Lactate & pyruvate pnl SerPlBld
- Synonyms
- Lactate & pyruvate pnl SerPlBld
- 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 This Test Is Done
Doctors may order this test to evaluate conditions affecting energy production, such as certain metabolic disorders, heart or lung diseases, or during exercise testing. It can also help monitor patients with conditions like lactic acidosis or mitochondrial disorders.
What to Expect Before the Test
No special preparation is typically needed, but you may be asked to fast for a few hours before the blood draw. Avoid strenuous activity or consuming large amounts of alcohol 24 hours prior if instructed by your healthcare provider.
What the Test Involves
A healthcare professional will draw blood from a vein in your arm. You may feel a brief pinch or discomfort, but it usually lasts only a moment. The blood sample is then sent to a lab for analysis.
What the Results Mean
A higher-than-expected ratio may suggest poor oxygen use, metabolic stress, or conditions like heart failure, sepsis, or certain genetic disorders. A lower ratio might indicate normal metabolic function or specific metabolic adaptations. Your results will be interpreted by your doctor in the context of your overall health and symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: Interpretation and Context
Short name
Lactate:Pyruvate Ratio (Serum/Plasma)
Frequently asked questions
Will this test show if I have a metabolic disorder?
What does a high or low ratio mean during exercise?
Can I eat or drink anything before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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