What is the normal percentage range for the LD5 isoenzyme in serum?

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Multiple Choice

What is the normal percentage range for the LD5 isoenzyme in serum?

Explanation:
LDH has five different isoenzymes, and in healthy serum the pattern is led by LDH-1 and LDH-2 with smaller amounts of the others. LDH-5, the liver and skeletal muscle isoenzyme, is normally present only in a small fraction of total LDH. That’s why the typical normal range for LDH-5 is about 6–16%. When liver or muscle tissue is damaged, LDH-5 can rise, shifting the overall LDH pattern toward a higher LDH-5 percentage. The other ranges would suggest a higher baseline LDH-5 than expected in a normal serum.

LDH has five different isoenzymes, and in healthy serum the pattern is led by LDH-1 and LDH-2 with smaller amounts of the others. LDH-5, the liver and skeletal muscle isoenzyme, is normally present only in a small fraction of total LDH. That’s why the typical normal range for LDH-5 is about 6–16%. When liver or muscle tissue is damaged, LDH-5 can rise, shifting the overall LDH pattern toward a higher LDH-5 percentage. The other ranges would suggest a higher baseline LDH-5 than expected in a normal serum.

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