Metabolic
LDH
LOINC 14804-9 · U/L
Ranges
Reference range: 140–280 U/L
What it is
LDH (lactate dehydrogenase) is an enzyme found in almost every tissue. It is released when cells are damaged.
Why it matters
Because it is so widespread, LDH is a general, non-specific marker of cell injury or turnover.
What high values can mean
A higher value signals cell damage somewhere in the body, including from hemolysis, infection or tissue injury.
What low values can mean
A lower value is uncommon and usually not a concern.
How to improve it
Because LDH is non-specific, care focuses on finding and treating the underlying cause rather than the number itself.
Food & lifestyle
No specific diet changes LDH; supporting general health is the broader aim.
Preparing for the test
A blood test; fasting is not usually required — follow your lab's instructions.
When to talk to a doctor
An elevated LDH is interpreted by a doctor with other tests to locate the cause.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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