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Lactate Dehydrogenase (LDH)
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Lactate Dehydrogenase (LDH) Blood Test: What Low, High and Optimal Lactate Dehydrogenase (LDH) Levels Mean.

Lactate Dehydrogenase (LDH) is a key enzyme in energy metabolism that catalyses the reversible conversion of lactate to pyruvate, helping your cells maintain energy production when oxygen availability fluctuates during activity. It’s present in most body tissues and widely measured in blood using units of U/L. In Australia, typical adult reference ranges are ~120–250 U/L in standard pathology tests. Monitoring LDH can offer insight into how your metabolism responds to physical stress and recovery, helping you optimise energy pathways and metabolic efficiency now and over the long term.

Vively's health team can help you test Lactate Dehydrogenase (LDH). Start with Vively's Baseline Health Check first - only $99 today.
Dr Michelle Woolhouse
July 1, 2026
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What is Lactate Dehydrogenase?

Lactate Dehydrogenase is an enzyme that supports the interconversion of lactate and pyruvate, central to cellular energy metabolism and metabolic flexibility.

Why does it matter for long‑term health and wellbeing?

Tracking LDH trends can help you understand your body’s energy handling, metabolic adaptability, and response to physical stress or training loads, all of which support proactive metabolic health and longevity.

What's an optimal level of Lactate Dehydrogenase?

Australian pathology reference intervals for adults are generally about 120–250 U/L. An optimal zone might lie within the middle of this range (e.g., ~150–220 U/L) depending on activity levels and personal goals.

What influences Lactate Dehydrogenase levels?

Exercise intensity, muscle metabolism, and overall metabolic activity influence LDH, as the enzyme responds to changes in energy demand and oxygen availability.

What does it mean if Lactate Dehydrogenase is outside the optimal range?

Values consistently above or below your typical range may reflect shifts in metabolic activity or energy balance; tracking over time can highlight lifestyle or training adaptations.

How can I support healthy Lactate Dehydrogenase levels?

Balanced nutrition, regular varied exercise, appropriate recovery, and sleep support healthy energy metabolism and efficient enzyme function.

This information is provided for general health and wellness purposes only and does not replace medical advice.

References:

  1. Pathology Tests Explained. Tests – Lactate dehydrogenase (LDH). 2023.
  2. Farhana A & Lappin SL. Biochemistry, Lactate Dehydrogenase. StatPearls. 2023.
  3. Klein R. Clinical and Diagnostic Significance of Lactate Dehydrogenase. 2020.
  4. MedlinePlus. Lactate Dehydrogenase (LDH) Isoenzymes Test. 2023.
Lactate Dehydrogenase (LDH)

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