What this test measures
Pyruvate is the end-product of glycolysis. Under aerobic conditions it enters the mitochondria and the citric acid cycle for energy production; under anaerobic conditions it is converted to lactate. The blood pyruvate level is rarely useful alone — it is interpreted with simultaneous blood lactate as the lactate-to-pyruvate (L/P) ratio.
A high L/P ratio (>20–25) with raised lactate suggests a problem downstream of pyruvate — mitochondrial respiratory chain disorders, where pyruvate cannot be efficiently used. A normal or low L/P ratio with raised lactate suggests pyruvate dehydrogenase deficiency, gluconeogenic defects, or thiamine deficiency — where pyruvate accumulates.
Why it matters
In India, pyruvate testing is a niche metabolic test ordered by paediatric or adult metabolic specialists when an inborn error of metabolism — mitochondrial disease, pyruvate dehydrogenase deficiency, biotinidase deficiency, or thiamine-responsive disorders — is suspected. Symptoms can include unexplained lactic acidosis, encephalopathy, developmental delay, hypotonia, seizures, recurrent vomiting, or cardiomyopathy.
It is also used in Leigh syndrome and other mitochondrial diseases. The test requires careful sample handling — pyruvate is unstable and the sample must be precipitated with perchloric acid at the bedside and placed on ice immediately. Most general labs will refer the test to a specialised metabolic lab.
How to prepare
Fasting morning sample preferred. Strict sample handling — sample drawn into a tube with perchloric acid, kept on ice, transported immediately. Mention all medications, recent infections, and any developmental concerns. Confirm with the lab in advance — many labs do not perform this test in-house.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Pyruvate (mg/dL or µmol/L)[1][2] | 0.3 – 0.9 mg/dL (30 – 100 µmol/L) | Low pyruvate is rarely clinically meaningful. | Raised pyruvate (often with raised lactate) — pyruvate dehydrogenase deficiency, thiamine deficiency, biotinidase deficiency, severe sepsis / shock, mitochondrial disease, anaesthesia, post-seizure. The lactate/pyruvate ratio is more informative than pyruvate alone. |
| Lactate/Pyruvate Ratio (ratio) | < 20 – 25 | Normal or low ratio with raised lactate — suggests pyruvate dehydrogenase deficiency, thiamine deficiency, or gluconeogenic defects. | High L/P ratio (>25) with raised lactate — suggests mitochondrial respiratory chain disorders (Leigh syndrome, MELAS, mitochondrial cytopathies), severe tissue hypoxia, or shock. |
Lactate / pyruvate ratio in metabolic disorders
| Lactate | L/P ratio | Likely category | Examples |
|---|---|---|---|
| Raised | < 20 | Pyruvate utilisation defect | Pyruvate dehydrogenase deficiency, thiamine deficiency, biotinidase deficiency |
| Raised | > 25 | Respiratory chain / NADH oxidation defect | Mitochondrial disease (Leigh, MELAS), severe shock |
| Normal | Normal | Not a primary metabolic acidosis | Other causes |
| Raised | Variable | Acquired causes | Sepsis, drug toxicity, hypoxia, seizure |
Frequently asked questions
When is pyruvate tested?
Mainly in suspected inborn errors of metabolism — unexplained lactic acidosis, encephalopathy, developmental delay, hypotonia, mitochondrial disease, or pyruvate dehydrogenase deficiency. Adult use is rare and specialist-driven.
Do I need to fast?
Yes — fasting morning sample. Mention all medications and recent illnesses.
Why is the sample handling so strict?
Pyruvate is unstable; cells continue to produce or consume it after the sample is drawn. The sample is drawn into perchloric acid (which immediately denatures cellular enzymes) and kept on ice. Without this, the result is unreliable.
What does the lactate/pyruvate ratio tell us?
It separates two categories of metabolic disease. High L/P (>25) with raised lactate points to mitochondrial respiratory chain dysfunction. Normal or low L/P with raised lactate points to defects upstream — pyruvate dehydrogenase, thiamine, biotinidase.
Is pyruvate testing widely available?
No — it is a specialised metabolic test, available mainly in tertiary centres and a few reference labs. Confirm availability and sample handling with the lab before collection.
Can thiamine deficiency cause raised pyruvate?
Yes — thiamine is a cofactor for pyruvate dehydrogenase. Severe deficiency (alcoholism, prolonged fasting, hyperemesis gravidarum, refeeding syndrome) causes pyruvate accumulation, lactic acidosis, and Wernicke encephalopathy. Treatment with IV thiamine reverses the picture.
How is mitochondrial disease diagnosed?
Often by a combination of clinical features, raised lactate / high L/P ratio, MRI brain (Leigh syndrome pattern), muscle biopsy (ragged red fibres, COX-negative fibres) and genetic testing (mitochondrial DNA + nuclear DNA panel).
Related Other / Biochemistry tests
Tests commonly ordered alongside PYRUVATE, or that help interpret an unexpected result.
Sources & references
- Mayo Clinic Laboratories — Pyruvate, Plasma · accessed 2026-05-30T00:00:00.000Z
- NCBI StatPearls — Lactic Acidosis · accessed 2026-05-30T00:00:00.000Z
- GARD — Mitochondrial Disorders · accessed 2026-05-30T00:00:00.000Z
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