The Lactic Dehydrogenase (LDH) blood test is a medical test used to measure the levels of LDH in the blood. LDH is an enzyme found in many different tissues throughout the body, including the heart, liver, kidneys, and muscles.

The LDH blood test is primarily used to diagnose and monitor conditions that cause damage to cells and tissues, such as heart attack, liver disease, kidney disease, muscle injury, and cancer. LDH levels can also be elevated in certain infections and inflammatory conditions.

The LDH blood test is performed by taking a small sample of blood from a vein in the arm. The sample is then sent to a laboratory for analysis. Results are usually available within a few days.

Normal levels of LDH in the blood vary depending on age, gender, and other factors. In general, normal levels range from 100 to 190 units per liter (U/L) in adult males and 100 to 170 U/L in adult females. Elevated levels of LDH may indicate tissue damage or disease, while low levels are generally not a cause for concern.

It is important to note that LDH levels can be influenced by many factors, including exercise, certain medications, and other medical conditions. Your healthcare provider will interpret the results of your LDH blood test in the context of your individual health status and medical history.