Why rapid at-home PSA tests for prostate cancer are fast, convenient – and unreliable

A recent BBC investigation questioned the accuracy of prostate-specific antigen (PSA) self-tests – rapid at-home tests for men worried about prostate cancer. The BBC analysed five of these tests using one blood sample and found varying results: one positive, three negative, and one unreadable.

PSA blood tests measures levels of PSA, a protein produced by the prostate gland. All men have some PSA in their blood but a raised level can suggest a problem with the prostate, including cancer.

In the…

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