Elevated LDH

Elevated LDH: Causes, Symptoms, and Treatment

Lactate dehydrogenase (LDH) is an enzyme found in nearly all cells of the body and plays a role in the energy production process. LDH levels in the bloodstream increase especially when cells are damaged. Therefore, elevated LDH in the blood is often a sign of cell destruction, inflammation, organ damage, or serious diseases.

What is LDH?

Lactate dehydrogenase (LDH) is an enzyme that contributes to energy production by converting lactic acid to pyruvate. The LDH enzyme is found in many places including muscles, heart, liver, kidneys, lungs, and red blood cells. When cells are damaged, this enzyme leaks into the bloodstream, causing its level in the blood to rise. Therefore, the answer to what elevated LDH is can be summarized as a direct indicator of cell damage.

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What Should the LDH Level Be?

In healthy individuals, the LDH value is generally between 140-280 U/L (units per liter). However, this range may vary slightly depending on the laboratory testing system used. Doctors consider the patient's age, overall health status, and other laboratory findings when evaluating LDH levels.

When asked what the ideal LDH level is, it can be said that this value alone does not provide a diagnosis. However, it helps in the assessment of many diseases.

Causes of Elevated LDH

The question of why LDH is elevated can indicate a wide range of health problems. Causes of elevated LDH include, especially, cell damage, destruction of blood cells, or side effects of some medications. These conditions lead to tissue damage and increase LDH levels. Below are common causes that can explain why LDH rises:

  • Heart attack
  • Liver diseases (hepatitis, cirrhosis, etc.)
  • Kidney diseases
  • Muscle injuries
  • Anemia (especially hemolytic anemia)
  • Cancers (including leukemia, lymphoma, lung and liver cancer)
  • Infections
  • Thyroid diseases
  • Surgical trauma or burns

Each of these conditions can cause the breakdown of cells and the release of LDH enzyme into the blood. Therefore, elevated lactate dehydrogenase may be a sign of another underlying problem.

Tissue Damage and Cell Death

It usually occurs with the release of the LDH enzyme found in cells. LDH increase can be seen especially in cell damage in the following conditions:

  • Traumas (muscle bruises, sports injuries)
  • Muscle breakdown (rhabdomyolysis)
  • Severe infections
  • Burns
  • Sickle cell anemia
  • Leukemia and other hematological diseases
  • Postoperative tissue destruction

In these processes, LDH levels can be much higher than normal when a blood sample is taken.

Blood Diseases and Elevated LDH

It is an important biomarker indicating destruction particularly in blood cells. In the following blood diseases, this enzyme level increases:

  • Hemolytic anemia
  • Megaloblastic anemia
  • Leukemia and lymphoma
  • Sickle cell anemia

These types of diseases cause the breakdown of red blood cells and the release of LDH into the blood.

Cancer and Elevated LDH

It can be observed in many types of cancer. The elevation is more pronounced especially in the following cancer types:

  • Leukemia
  • Lymphoma
  • Lung, liver, stomach, and breast cancer
  • Metastatic cancers

Elevated lactate dehydrogenase helps indicate the progression level of cancer and can be used to monitor the treatment process.

LDH Elevation Symptoms

Although it usually does not have a specific symptom, the symptoms of elevated LDH vary according to the underlying cause. Common symptoms are as follows:

  • Fatigue and weakness
  • Muscle pain
  • Abdominal pain
  • Fever
  • Shortness of breath
  • Loss of appetite
  • Nausea and vomiting
  • Jaundice (especially in liver diseases)
  • Paleness or bruising of the skin

These symptoms alone do not indicate elevated LDH; however, they should be evaluated within the context of LDH elevation symptoms.

How Is LDH Elevation Diagnosed?

It is usually detected through routine blood tests. If the LDH level in the blood sample exceeds normal reference ranges, this condition is identified. However, additional tests may be required to understand the underlying disease, such as:

  • Liver enzyme tests
  • Kidney function tests
  • Heart enzyme tests
  • LDH isoenzyme analysis (to determine the tissue of origin)

These analyses are very important in finding detailed answers to the question of why LDH is elevated.

How to Lower Elevated LDH?

The approach to lowering elevated LDH depends on treating the underlying cause. In other words, the cause that raises LDH must be eliminated first. Treatment options include:

  • If infection-related: Antibiotic or antiviral treatment is applied.
  • If liver diseases are present: Alcohol is stopped, and liver-supporting medications are used.
  • In case of heart attack: Blood thinners and heart-supportive treatments are applied.
  • If cancer is present: Chemotherapy, radiotherapy, or surgical methods are preferred.
  • In muscle diseases: Physical therapy and muscle-strengthening exercises are recommended.

To maintain balanced LDH levels, you can do the following:

  • Eat foods rich in antioxidants.
  • Avoid stress.
  • Exercise regularly.
  • Have regular health check-ups.

How Is LDH Elevation Treated?

Treatment depends entirely on controlling the disease causing the LDH elevation. For example:

  • In case of a heart attack, heart-protective medications and diet are recommended.
  • In liver diseases, LDH levels can be lowered through nutrition regulation and medication.
  • If there is kidney failure, dialysis or medication may be required.

In all cases, adhering to the doctor’s recommended plan is the most effective way to manage elevated LDH.

Additionally, during the treatment process, not only the LDH level in the blood but also LDH levels in other body fluids are important. LDH enzyme measurements can be performed in samples such as cerebrospinal fluid, pleural fluid, abdominal fluid, and joint fluid. These fluids are important for evaluating various health conditions.

Elevated LDH levels in these fluids help in assessing conditions like infections, cancers, or autoimmune diseases. Therefore, doctors consider LDH levels not only in blood but also in other body fluids. This ensures a better diagnosis and treatment process.

How to Prevent LDH Elevation?

To prevent LDH elevation, general health habits should be observed:

  • Regular exercise
  • Avoiding alcohol and smoking
  • Balanced nutrition
  • Reducing excessive stress
  • Managing chronic diseases
  • Having regular blood tests

With early diagnosis and preventive measures, lactate dehydrogenase levels can remain within a healthy range.

Is LDH Measured Only in Blood?

LDH testing can be done not only in blood but also to measure LDH levels in other body fluids.

LDH measurement can especially be done in the following fluids:

  • Cerebrospinal fluid
  • Pleural fluid
  • Peritoneal fluid (ascites)
  • Synovial fluid

These measurements help in diagnosing conditions such as infection, cancer, or inflammation. Therefore, doctors may evaluate LDH levels in other body fluids besides blood samples in certain special cases.

In conclusion, it can be an indicator of serious cell damage or disease in the body. Being informed about LDH elevation allows for early identification of risks. If your doctor recommends an LDH test, you should follow this advice and start the necessary treatment process without delay. Elevated LDH in blood can be controlled with early diagnosis and appropriate interventions.

Prepared by A Life Medical Editorial Board.

Last Updated: 6 Kasım 2025 14:05

Publish Date: 24 Nisan 2024 17:36

Elevated LDH

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