Isoenzyme assays are performed to improve which diagnostic parameter?

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Multiple Choice

Isoenzyme assays are performed to improve which diagnostic parameter?

Explanation:
Isoenzyme assays distinguish different tissue forms of the same enzyme. By identifying which isoforms are elevated, you can tell which tissue is releasing the enzyme, reducing misattribution from other tissues. This makes the test more specific for a given diagnostic source. For example, measuring the heart-specific CK-MB isoenzyme provides greater specificity for myocardial injury than total CK, because total CK can be elevated from skeletal muscle injury as well. While precision or sensitivity aren’t the primary gains from isoenzyme separation, the ability to pinpoint the tissue source of an elevation is what most clearly improves diagnostic specificity.

Isoenzyme assays distinguish different tissue forms of the same enzyme. By identifying which isoforms are elevated, you can tell which tissue is releasing the enzyme, reducing misattribution from other tissues. This makes the test more specific for a given diagnostic source. For example, measuring the heart-specific CK-MB isoenzyme provides greater specificity for myocardial injury than total CK, because total CK can be elevated from skeletal muscle injury as well. While precision or sensitivity aren’t the primary gains from isoenzyme separation, the ability to pinpoint the tissue source of an elevation is what most clearly improves diagnostic specificity.

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