Evaluation of sensitivity, specificity, PPV and NPV of pap test versus colposcopic directed biopsies, 1995-97

Abstract

259 consecutive colposcopic examinations were done at colposcopic unit in Shariati Hospital during 1995-97. 58 cases were omitted due to lack of biopsy report. There were 167 cases of concordance and 34 cases of discordance between results of pap test colposcopic directed biopsy in these cases. We evaluated the value of pap test as a screening test versus colposcopic directed biopsy and found sensitivity of 42.4%, specificity of 94%, PPV (Positive predictive value) of 60.8%, and NPV (Negative predictive value) of 89.3%, false nagative and false positive rates were 57.8% and 5.3%, respectively. If pap test and HPV DNA screening were done simultaneously, almost all invasive cancer and HiSIL would be detected