463: Genetic variants in gene-environment interaction analysis of probiotic intake in spontaneous preterm delivery

graphics and risk factors for SPTB. RESULTS: Maternal socio-demographics and clinical characteristics of study patients, and delivery outcomes are shown in the Table. Among women who received 17-P, mean initiation of therapy was 20.4 3.4 wks and mean number of injections was 12.1 6.3. Those who received 17-P were more likely to have a prior SPTB 26 wk factors for not receiving medications included not being offered by medical providers, no to minimal complications with previous PTD, and financial reasons. Rates of total PTB and SPTB were similar among those who received and did not receive 17-P (Table). CONCLUSION: In this high-risk urban clinic population, there was a high percentage of STPB among those who received 17-P in the routine obstetric setting, and among those who did not receive it. In addition, 46% of eligible patients were not offered or did not receive 17-P. Finally, these date are important in calculations of cost benefit analysis for using progesterone to prevent preterm birth.