Can a primary care doctor diagnose you with prostate cancer based on a psa test that shows elevated psa?

Prostate cancer: You can never diagnosed prostate cancer based on a psa test they just aren't that accurate. Diagnosing prostate cancer requires doing a biopsy. Most primary care physicians are good at finding suspicious lesions but they usually refer to urologist for biopsy. Psa tests are not that accurate.

No, you need biopsy: Psa is prostate specific, not cancer specific. Even in men with elevated psa and prostate nodules about 1/4 of them don't have cancer.

No: An elevated psa test can be from a variety of conditions. Even markedly elevated psa values do not confirm a cancer diagnosis. Also, a normal psa does not exclude prostate cancer as a possibility. The next best step is to see a urologist for further evaluation for a biopsy of the prostate.

No: An elevated psa should be the first step that should send a patient on the road for a full evaluation by a urologist. This will include a digital rectal examination and perhaps a biopsy of the prostate. Your primary doctor will help with selection of a urologist if your psa is elevated or has changed over time.

Maybe: If the psa is 100 the doc can be sure you have it, low values like 6 or 8 are far more common and can just be caused by larger gland sizes. A biopsy is the only way to be sure.

No but: If the primary care doctor felt a hard nodule on digital rectal exam and the psa is elevated, he or she would be strongly suspicious of prostate cancer and would refer you to a urologist for biopsy. A definite diagnosis can only be made by biopsy. The reason is a benign but enlarged prostate can raise the psa. A hard nodule sometimes is a prostatic stone. Best wishes.