When we take any test, it is preferable to get a definite answer: "yes, you have the cancer" or "no, you don't". Unfortunately the PSA test is not that good. At best, it is an indicator of the probability or risk that you have prostate cancer. This can be very helpful, because it guides the decision about whether you should have further tests. However it does mean that the interpretation of PSA levels is not necessarily straight forward.
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