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(PSA level and grade/stage of cancer). Low-risk cancers are the least likely to recur, but they are also the least likely to have required treatment in the first place.

Prostatitis

PSA levels increase in the setting of prostate infection/inflammation (prostatitis), often markedly (> 100).

Forensic identification of semen

PSA was first identified by researchers attempting to find a substance in seminal fluid that would aid in the investigation of rape cases. PSA is used to indicate the presence of semen

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