Mitochondrial Enzyme Activity: Pyruvate Substrate Conversion Rate (Serum/Plasma)
This test measures how well your mitochondria—your cells’ energy powerhouses—convert the sugar pyruvate into usable energy. Abnormal results may indicate mitochondrial dysfunction, which can affect energy levels, muscle function, or other metabolic processes.
["Assessing how efficiently your cells produce energy through mitochondrial function."]
Key facts at a glance
- LOINC
- 76616-2
- Short code
- Mito enzy Fib 1-14C-pyr substr-cCnt
- Synonyms
- Mito enzy Fib 1-14C-pyr substr-cCnt
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- c-pyruvate-substrate
- 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
What This Test Measures
The test evaluates the rate at which pyruvate, a key metabolic intermediate, is processed by mitochondrial enzymes. This process is critical for generating adenosine triphosphate (ATP), the energy currency of your cells. The measurement focuses on the catalytic activity of enzymes involved in this conversion pathway, providing insight into overall mitochondrial health.
Why It Matters in Your Body
Mitochondrial dysfunction can lead to fatigue, muscle weakness, or other systemic symptoms. While not all mitochondrial issues are detectable through this single test, it can help identify patterns of energy metabolism that may warrant further evaluation, especially in cases of unexplained fatigue, muscle problems, or neurological symptoms.
Common Causes of Abnormal Results
Results may be affected by conditions like mitochondrial disorders (e.g., MELAS syndrome), certain metabolic syndromes, or medications that impair mitochondrial function. Genetic factors, chronic illnesses, or exposure to toxins (e.g., certain drugs or environmental agents) could also influence these measurements.
When This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms like persistent fatigue, muscle weakness, or neurological issues that don’t improve with standard treatments. It may also be part of a broader evaluation for inherited metabolic disorders or mitochondrial diseases.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
While this test provides a snapshot of mitochondrial enzyme activity, it’s often used alongside other tests to diagnose or monitor mitochondrial disorders. Abnormally low rates may suggest impaired energy production, which could require lifestyle adjustments (e.g., dietary changes, exercise modifications) or medical interventions (e.g., mitochondrial support therapies).
Short name
Mitochondrial Enzyme Function Test
Frequently asked questions
How is this test typically collected?
What are the typical preparation instructions?
Could this test show results that are hard to interpret?
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