Figure 1.

Nomogram to calculate the risk of prostate cancer on biopsy. All markers are given in nanograms per milliliter, except for human kallikrein 2, which is given in 10 pg/ml. The model can be used for a man with elevated prostate specific antigen (PSA) at his first PSA test. tPSA, total PSA; fPSA, free PSA; iPSA, intact PSA.