LDH (lactate dehydrogenase) is an enzyme found in almost all body tissues. It rises when cells are damaged anywhere.
- Normal range (adults)
- 135–225 U/L
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- Lactate Dehydrogenase, LD, LDH, Lactic Dehydrogenase, Lactate Dehydrogenase LDH
LDH normal range
| Group | U/LSame unit in all countries |
|---|---|
| Adults | 135–225 |
Ranges vary slightly between laboratories. The range printed on your own report is the one to go by.
Why is the LDH test done?
It is a general marker of tissue damage and is used in monitoring anemia, some cancers and lung infections.
What does a high LDH level mean?
A high LDH shows tissue damage but does not say where.
Common causes
- Breakdown of red blood cells
- Liver disease
- Muscle injury
- Lung infections
- B12 deficiency
- Some cancers
- A sample damaged during collection
Diet and lifestyle tips
- No specific diet; your doctor will look for the cause
When should you see a doctor?
Your doctor will interpret LDH with other tests; it is rarely useful on its own.
Last updated
This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.