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PSA used alone is not a good predictor of Prostate Cancer. As noted there are many causations that can lend to elevated PSA results such as an infection, sexual activity, exercise (bike riding), etc... and age as well! A PSA reading in the 7's might not necessarily be too alarming depending upon personal history.
PSA is a gateway indicator to a possible need for further investigation, testing to determine the underlying cause of elevation. There are non-invasive liquid biopsies today that lend accurate diagnosis. And baseline imaging with MRI's that would and could better reveal if there is an issue. Usually there will be some symptoms present if in fact and elevated PSA might be associated with PCa off the bat. The DRE (digital rectal exam) might expose any abnormalities (lumps) during a physical exam, BPH, urinary, sexual and other dysfunction that would cause suspicion.
But elevated PSA alone... Means nothing!
Good luck and best regards!
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