Advanced Cardiac Technologies: Minimally Invasive Vascular Procedures Explained

Lactate dehydrogenase, commonly known as LDH, is an enzyme found in nearly all body tissues. It plays a crucial role in converting sugar into energy for cells to use. When tissues are damaged or diseased, cells break down and release LDH into the bloodstream, making it detectable through a blood test. An LDH test measures the amount of this enzyme in the blood and can help healthcare providers identify tissue damage and monitor certain medical conditions.

The LDH test is used for various diagnostic purposes. It can help detect and monitor conditions that cause tissue damage, such as liver disease, heart attack, stroke, certain types of anemia, and muscle injuries. The test is particularly useful in diagnosing and monitoring certain cancers, including lymphoma and leukemia, as cancer cells often produce high levels of LDH. Additionally, healthcare providers may order this test to evaluate the effectiveness of cancer treatment or to investigate unexplained symptoms like severe fatigue, shortness of breath, or abdominal pain.

The test is performed using a simple blood sample, typically drawn from a vein in the arm. No special preparation is usually required, though patients should inform their healthcare provider about any medications or supplements they are taking, as some substances can affect test results. Strenuous exercise before the test should be avoided, as it can temporarily elevate LDH levels. The blood sample is then sent to a laboratory where technicians measure the amount of LDH present.

Normal LDH levels vary depending on the laboratory and testing method used, but generally range from 140 to 280 units per liter for adults. Elevated LDH levels indicate tissue damage somewhere in the body, though the test alone cannot pinpoint the exact location or cause. High levels may result from heart attack, liver disease, kidney disease, certain infections, blood disorders, muscle trauma, or cancer. Extremely high levels often suggest severe tissue damage or widespread disease. Conversely, low LDH levels are uncommon and usually not clinically significant. If LDH levels are abnormal, healthcare providers typically order additional tests to determine the underlying cause and develop an appropriate treatment plan.