J L Boddy1, S Dev, D J Pike, P R Malone. 1. Department of Urology, Royal Berkshire and Battle Hospital, Oxford Road, Reading RG30 1AG, UK. boddyjane@hotmail.com
Abstract
OBJECTIVE: To determine the intra-individual (physiological) variation of prostate-specific antigen (PSA) measurements in men after a benign prostatic biopsy. PATIENTS AND METHODS: Sixty-four men were prospectively assessed, all of whom had a benign prostatic biopsy within the preceding 13 months. The degree of intra-individual variability was established by calculating the coefficient of variation on four PSA levels obtained from each patient weekly over a month. RESULTS: Six patients were subsequently diagnosed with prostate cancer and their data are presented separately. In the remaining 58 patients the median (range) individual mean PSA value was 6.3 (0.5-34.1) ng/mL. The median (range) coefficient of variation within the group was 9.5 (2.4-76.1)%. There was a clear linear relationship between mean PSA level and the standard deviation. CONCLUSION: In 48 of the 63 patients analysed, the coefficient of variation for serum PSA values in the group as a whole was greater than the variation claimed for the assay technique. The significance of the linear relationship between PSA and the standard deviation is discussed, with particular reference to those men who had a benign prostate biopsy.
OBJECTIVE: To determine the intra-individual (physiological) variation of prostate-specific antigen (PSA) measurements in men after a benign prostatic biopsy. PATIENTS AND METHODS: Sixty-four men were prospectively assessed, all of whom had a benign prostatic biopsy within the preceding 13 months. The degree of intra-individual variability was established by calculating the coefficient of variation on four PSA levels obtained from each patient weekly over a month. RESULTS: Six patients were subsequently diagnosed with prostate cancer and their data are presented separately. In the remaining 58 patients the median (range) individual mean PSA value was 6.3 (0.5-34.1) ng/mL. The median (range) coefficient of variation within the group was 9.5 (2.4-76.1)%. There was a clear linear relationship between mean PSA level and the standard deviation. CONCLUSION: In 48 of the 63 patients analysed, the coefficient of variation for serum PSA values in the group as a whole was greater than the variation claimed for the assay technique. The significance of the linear relationship between PSA and the standard deviation is discussed, with particular reference to those men who had a benign prostate biopsy.
Authors: Anders Christensson; Laila Bruun; Thomas Björk; Angel M Cronin; Andrew J Vickers; Caroline J Savage; Hans Lilja Journal: BJU Int Date: 2010-10-18 Impact factor: 5.588
Authors: Kwang Suk Lee; Kyo Chul Koo; Kang Su Cho; Seung Hwan Lee; Woong Kyu Han; Young Deuk Choi; Sung Joon Hong; Sang Un Park; Suk Young Lee; Woo Jin Ko; Young Sig Kim; Byung Ha Chung Journal: Prostate Int Date: 2016-12-23