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Liver

LDH Blood Test: What Does Lactate Dehydrogenase Tell You?

LDH is a general tissue damage marker that provides a broad overview of cellular health. Regular monitoring can help detect early signs of tissue stress and guide further investigation when needed.

What It Measures

LDH is an enzyme involved in energy production within cells. It catalyses the conversion of lactate to pyruvate and is present in many tissues throughout the body.

This test measures the total concentration of LDH in your blood. When cells are damaged or destroyed, LDH is released into the bloodstream. Because it is found in so many tissues, elevated LDH is non-specific and is typically used alongside other markers to help identify the source of tissue damage.

Why It Matters

LDH serves as a general indicator of tissue damage. Elevated levels can be associated with conditions affecting the liver, heart, kidneys, lungs, muscles, or blood cells, including haemolytic anaemia and certain cancers.

While LDH alone cannot diagnose a specific condition, it is a valuable tool when used alongside other tests. Serial measurements may also help monitor disease progression or treatment response.

When to Test

LDH testing may be recommended when tissue damage is suspected but the source is unclear, or as part of a broader diagnostic workup. It is commonly included in liver panels and general health assessments.

Monitoring LDH over time may also be useful for tracking conditions such as anaemia, certain cancers, or organ damage following injury or illness.

Symptoms

Low Levels

Low LDH levels are rare and generally not clinically significant. They are usually not associated with specific symptoms or health concerns.

High Levels

Fatigue and general weakness
Shortness of breath
Nausea or loss of appetite
Muscle pain or cramping
Unexplained weight loss

Recommendations

Male

If Low

Low LDH is generally not concerning and usually does not require follow-up.

If High

Elevated LDH may indicate tissue damage in the liver, heart, or other organs. Consider further evaluation to identify the source.

Female

If Low

Low LDH is generally not concerning and usually does not require follow-up.

If High

Elevated LDH may indicate tissue damage in the liver, heart, or other organs. Consider further evaluation to identify the source.

Lifestyle Tips

Because LDH is a non-specific marker, lifestyle recommendations depend on the underlying cause of elevation. In general, maintaining a healthy lifestyle with regular exercise, balanced nutrition, and adequate rest supports overall tissue health.

Avoid excessive physical exertion without adequate recovery, as intense exercise can temporarily elevate LDH. Stay hydrated and consult your healthcare provider if LDH levels remain persistently elevated to identify and address the underlying cause.

Frequently Asked Questions

Why is LDH considered a non-specific marker?
LDH is found in nearly every tissue in the body, so elevated levels can result from damage to any of these tissues. Additional tests are needed to determine which organ or tissue is affected. Your healthcare provider will interpret LDH in context with other results.
Can exercise raise LDH levels?
Yes, intense physical activity can temporarily elevate LDH levels due to minor muscle damage. This is usually not a cause for concern. If you had strenuous exercise before your blood test, mention this to your healthcare provider.
How is LDH used together with other tests?
LDH is often combined with organ-specific markers to identify the source of tissue damage. For example, elevated LDH with elevated ALT may point to the liver, while elevated LDH with abnormal blood cell counts may suggest haemolysis.