Lactate Dehydrogenase (LDH) Test

What is a Lactate Dehydrogenase (LDH) Test?

The lactate dehydrogenase (LDH) test is a routine blood test that measures the level of LDH in the blood. LDH is an enzyme that is found in many different organs, including the liver, kidneys, heart, lungs, muscles, and red blood cells, so it can provide an indication of how well these organs are functioning. The LDH test is often used to diagnose or monitor certain illnesses such as heart attacks, liver disease, leukemias, anemias, and kidney and muscle diseases.

What is the Preparation for the LDH Test?

There is no special preparation or fasting required for the LDH test. The doctor may request that the patient not take certain medications before the test, such as anticoagulants or anticonvulsants, unless instructed otherwise.

What is the Procedure for this Test?

The procedure for the LDH test is relatively simple. The doctor will take a blood sample from an artery or from a vein in the patient's arm. The blood sample is then sent to a laboratory for analysis. The results of the test are usually available within one to two days.

What are the Types of LDH Tests?

There are three different types of LDH tests: an LDH Total test, an LDH Isomer test, and an LDH Isoenzyme test. The LDH Total test measures the amount of LDH in the blood regardless of the specific type of LDH. The LDH Isomer and LDH Isoenzyme tests measure the amount of specific types of LDH in the blood. These tests can help identify certain conditions such as liver disease or hemolysis.

What are the Risks of the LDH Test?

The risk of the LDH test is minimal. The most common risk is bruising or discomfort around the area where the blood was taken. Other possible risks are minor infections and bleeding.

Why is the LDH Test Done?

The LDH test is done to diagnose or monitor certain conditions. It can help to identify a variety of diseases such as heart attacks, liver disease, leukemias, anemias, and kidney and muscle diseases. It can also help to determine the effectiveness of certain treatments or medications, such as chemotherapy or antibiotics.

When is the LDH Test Done?

The LDH test is usually ordered by a doctor if there is a suspicion of a certain condition, such as heart attack or liver disease, or when monitoring the progress of a condition or treatment. It may also be used in combination with other tests to help diagnose a condition. Most often, the test is done as part of a routine physical or when the patient has an increased level of LDH in the blood.