Search results for "Total psa"
showing 2 items of 2 documents
Error calculation for the PSA quotient.
2008
Abstract Objective Prostate specific antigen (PSA) assays have significant measurement errors, but the error associated with the PSA quotient (free to total PSA) often remains unknown. Methods We used both Gaussian error calculation and measurement of imprecision to investigate the level of error associated with the PSA quotient. Results Surprisingly, we found that the error of the PSA quotient at low levels is markedly smaller than that of the total PSA value. Conclusions The PSA quotient should be calculated and considered as a clinically relevant value.
Is free/total PSA predictive of pathological stage and Gleason score in patients with prostate cancer and serum PSAor=10 ng/ml?
2005
<i>Introduction:</i> To evaluate whether percent free prostate-specific antigen (%-fPSA) could be predictive of pathological stage and Gleason score in patients with prostate cancer (PCa) and serum PSA of 10 ng/ml or less. <i>Materials and Methods:</i> In 100 patients with total PSA≤10 ng/ml who underwent radical retropubic prostatectomy as primary treatment of PCa, %-fPSA levels in organ-confined vs. non-organ-confined PCa and in patients with Gleason score ≤/>7 were compared. <i>Results:</i> 32 patients had an organ-confined and 68 a locally advanced PCa. Median %-fPSA level was 15%; Gleasonscore was <7 in 49 patients, equal to 7 in 40 and >7 i…