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What are ldh isoenzymes?
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Dr. Ed Friedlander
Pathology
In brief: Obsolete test
There are five forms of the ldh enzyme.
Type i is especially abundant in heart, and if it was higher than type ii, it was a marker for heart attack. If all five were equally high, think infectious mono, type v was marker for skeletal muscle or liver injury, and so forth, type iii for a lung infarct. It was helpful but today's labs are more sensitive and more specific.

In brief: Obsolete test
There are five forms of the ldh enzyme.
Type i is especially abundant in heart, and if it was higher than type ii, it was a marker for heart attack. If all five were equally high, think infectious mono, type v was marker for skeletal muscle or liver injury, and so forth, type iii for a lung infarct. It was helpful but today's labs are more sensitive and more specific.
Dr. Ed Friedlander
Dr. Ed Friedlander
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