Dr. Nayar asks, "Since Mr. Reynolds does not have a family history of prostate cancer, and is thus at average risk, what is one potential benefit and one possible harm of PSA screening that we could discuss with him

Possible Harm from Screening: False positive test results.

Possible Benefits of Screening: Early finding of prostate cancers that may be at high risk of spreading

Explanation:

Possible Harm from Screening

False positive test results: This occurs when a man has an abnormal PSA test but does not have prostate cancer. It often lead to unnecessary tests, like a biopsy of the prostate, and tend to cause men to worry about their health.

Possible Benefits of Screening: Early finding of prostate cancers that may be at high risk of spreading, thus, they can be treated before they spread, which helps lower the chance of death from prostate cancer in some men.

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explanation:

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.