GMAT Critical Reasoning (CR) | Re: In testing for food allergies, a false positive result

In testing for food allergies, a false positive result occurs when a person is said to be allergic to a particular food when, in fact, they are not allergic to that food. A false negative result indicates that a person is not allergic to the food when, in fact, they are. To most accurately determine food allergies, a physician should use the test that gives the smallest percentage of false negative results.

Goal is to determine accurately food allergies.
Two types of tests are there :
1> that measure
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