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Lactate Dehydrogenase (LD) Isoenzymes

Item# LC001842

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  • Lactate Dehydrogenase (LD) Isoenzymes
  • Item Catalog Number: LC001842

This test measures the relative percentage of isoenzymes (LD1-5).

Sample Report

Lactate dehydrogenase (LD) is an enzyme that is found in almost all of the body's cells, but only a small amount of it is usually detectable in the blood. LD is released from the cells into the bloodstream when cells are damaged or destroyed. Because of this, the LD test can be used as a general marker of injury to cells.

Although there is some overlap, each of the five LD isoenzymes tends to be concentrated in specific body tissues. In general, the isoenzyme locations are as follows:

  • LD-1: heart, red cells, kidney
  • LD-2: heart, red blood cells, kidney (lesser amounts than LD-1)
  • LD-3: lungs and other tissues
  • LD-4: white blood cells, lymph nodes, muscle, liver (lesser amounts than LD-5)
  • LD-5: liver, skeletal muscle

Fasting is not required for this test. Take all medications as prescribed.


The laboratory services are for informational purposes only. It is not the intention of National Diagnostics, Inc and Life Extension to provide specific medical advice but rather to provide users with information to better understand their health. Specific medical advice including diagnosis and treatment will not be provided. Always seek the advice of a trained health professional for medical advice, diagnosis or treatment.

Both the physician and the testing laboratory are independent contractors with whom National Diagnostics, Inc makes arrangements for your blood tests. Neither National Diagnostics, Inc or Life Extension will be liable for any acts or omissions of the physician, the testing laboratory, or their agents or employees.