A retrospective quantitative study was carried out from January to June 2006, to know thernmagnitude and trend of HIV/AIDS epidemic in Addis Ababa using data from the routinernVCT services as an alternative data source and thereby to determine its impact on selectedrndemographic variables.rnBased on the large sample size (481,648 VCT clients in Addis Ababa) taken inference wasrnmade to estimate the prevalence of HIV/AIDS for the entire Addis Ababa. Accordingly, thernVCT based modeled prevalence curve depicts three epidemic patterns that show a gradualrnincrement at the start of the HIV epidemic followed by a rapid rise to a peak and rapid fall inrnHIV prevalence with a subsequent slowing down in the pace of the HIV prevalence.rnIn this study, both ANC and VCT modeled prevalence rates showed similar and regularrntrend from the beginning of the HIV epidemic till the year 1995 where the modeled ANCrndata showed higher prevalence rates. However, a lower HIV prevalence was noted for thernANC than the VCT modeled data during the years of 1996 through 2002. On the contrary,rnthe ANC modeled prevalence was higher than the VCT prevalence starting from 2004rnonwards where a maximum difference of 2.2 percent was observed towards the end of thernprojection period.rnThis study suggests that VCT modeled HIV prevalence data closely approximate prevalencernamong all ANC attendees in Addis Ababa setting where very high participation rate exists tornthe routine VCT services.rnBased on the two sets of data sources and the corresponding HIV prevalence obtained, thernstudy shows that, in the absence of AIDS, the two major mortality indicators namely: IMRrnand U5MR decline over the projection period. The presence of HIV/AIDS epidemic,rnhowever, slows down this decline, and in fact reverses it in some cases like CDR and LE atrnbirthAlthough ANC based surveillance system provides solid long-term data, the rapid expansionrnof routine VCT program in an urban setting like Addis Ababa can be considered as anrnalternative data source to replace or supplement the ANC based surveillance, where arnpopulation based sero-prevalence survey is less likely to be conducted at regular intervals tornmonitor the HIV/AIDS epidemic trend