PSA is being used for prostate cancer screening. When someone has a result that is above the agreed upon cut off and does not have prostate cancer, by definition, they have a 'false positive'. This is 75% of the 'positive' tests. Of the 25% that are 'true positives' (the men have prostate cancer), up to half of the cancers would not have caused symptoms or problems in the men's lifetime.
These are the facts. Please do not imply otherwise.
The most respected body in the United States that gives opinions on screening does not recommend routine screening for low risk men in an opinion released in May 2018.
https://screeningforprostatecancer.org/
Men who have a family history of prostate cancer, have certain familial cancers in their family or are African American should be followed more closely.
It is not difficult to understand why people hold strong opinions about this but it is unreasonable not to acknowledge the serious potential harms involved in routine screening. It is heartening to hear of some who have benefited from PSA testing.