Sensitivity answers: of everyone who has the disease, how many did the test catch. A test with 90 percent sensitivity misses one in ten cases. High sensitivity is what you want when missing a case is the costly error, which is why triage devices are optimized for it.

Where This Gets Misread

Sensitivity says nothing about false positives and can be trivially maximized by calling everything positive. It is meaningless in isolation, and a vendor quoting sensitivity without specificity is quoting half a number.