Introdution The maternity services are essential for ES for CS. SCSP is a university hospital of São Paulo City, Brazil, It is, located in the central area of the city. Are seen at SCSP populations at high risk of infection by sexually transmitted diseases (STD), such as sex workers, injecting drug users and homeless.

Objetive To analyse the reported cases of congenital syphilis in SCSP, from 1999 to 2010.

Methods Through the surveillance system, data were obtained for all children born between 1998 and 2010 in the SCSP.

Results Were reported 555 cases of CS during the study period; considering the number of deliveries we have an average of 46.3 cases SC/year and 2.6 by 100 deliveries CS. The average age of mothers was 29 years old (ranging from 11 to 46 years) and only 6.1% had more than 7 years of schooling; 59% of pregnant women attend prenata, but these only 49% had seven or more visits, and only 13.8% were diagnosed with syphilis during pregnancy, but the treatment of pregnant women or partners was not considered adequate.

Conclusion The analysis of the data reflects the quality of prenatal care offered; Our Monitoring Service is the most notify CS in São Paulo state, probably by the population at risk for STDs that it serves, it is necessary that those responsible for improving maternal health actions for these segments of the population. The ES is very important for the control of CS assisting in planning, control and evaluation of actions.