In a "good" diagnostic test (one that attempts to identify with precision people who have the condition), the false positives should be very low. That is, people who are identified as having a condition should be highly likely to truly have the condition. This is because people who are identified as having a condition (but do not have it, in truth) may be subjected to: more testing (which could be expensive); stigma (e.g. HIV positive test); anxiety (e.g., I'm sick...I might die).