Also, false positive.
1. Medicine/Medical. a.
a test result that is incorrect because the test indicated a condition or finding that does not exist: a false-positive for syphilis.
a person who receives this test result.
any screening test result that incorrectly detected or classified a person or thing: A false-positive at the airport could cause you to miss your flight.
a person or thing identified by such a test.
pertaining to or being a false-positive: The test has a false-positive rate of 4%.