LDH Blood Test: Meaning, Normal Levels, and Interpretation
The lactate dehydrogenase blood test measures LDH, an enzyme released during tissue damage. Normal LDH levels are typically 140–280 U/L in adults. High LDH levels indicate cell injury from conditions like liver disease, anemia, or muscle damage. Low levels are rare and usually not clinically significant.
Contents
Result interpretation LDH
What your result means based on common reference ranges
LDH levels within range indicate normal cellular turnover and no significant acute tissue damage or systemic pathology.
Mildly elevated LDH levels suggest minor tissue stress, recent exercise, or stable chronic conditions affecting cellular metabolism.
Significantly high LDH levels indicate active tissue destruction such as myocardial infarction, hemolysis, or severe liver disease.
Low LDH levels are uncommon and may reflect vitamin C interference or reduced muscle mass without clinical significance.
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What is LDH?
LDH (lactate dehydrogenase) is an enzyme involved in energy production and found in nearly all body tissues, including liver, heart, and muscles. A blood test for LDH reflects cellular damage because the enzyme is released when cells break down. Elevated LDH levels are seen in conditions such as hemolytic anemia, liver disease, and myocardial infarction. Although non-specific, LDH is useful for monitoring disease progression and treatment response. It is often interpreted alongside markers like ALT, troponin, or bilirubin to identify the source of tissue injury.
Reference ranges
Causes of abnormal values
Causes of low LDH
- • High vitamin C intake: interferes with LDH assay measurement
- • Genetic LDH deficiency: reduced enzyme production in rare inherited disorders
- • Low muscle mass: decreased baseline enzyme production in malnutrition
Causes of high LDH
- • Liver disease: hepatocyte damage releases LDH into bloodstream
- • Hemolytic anemia: red blood cell destruction increases enzyme levels
- • Muscle injury: trauma or exercise causes muscle fiber breakdown
- • Myocardial infarction: cardiac muscle damage elevates LDH significantly
- • Lung infarction: tissue death from embolism raises LDH levels
- • Malignancies: rapid tumor cell turnover increases LDH production
LDH in combination with other markers
Possible symptoms
- •Fatigue and weakness
- •Jaundice (yellow skin/eyes)
- •Shortness of breath
- •Muscle pain or tenderness
- •Abdominal discomfort
When to see a doctor
Consult a doctor if LDH levels exceed 500 U/L or continue rising over time. Seek medical advice if elevated LDH is accompanied by symptoms like chest pain, jaundice, or severe fatigue. Further testing is needed to identify the source of tissue damage.
What to do if abnormal
- Stay hydrated before repeat testing
- Avoid intense exercise 24 hours prior to test
- Review supplements, especially vitamin C intake
- Request follow-up organ-specific blood tests
- Monitor LDH trends over time
The information on this page is intended for general understanding of test results and does not replace medical consultation. Accurate interpretation requires considering other blood markers and individual factors.
Content is based on medical literature and used within the PulseBook analytical system.
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