Pregnant women, under 32 weeks gestation, who are admitted to Winthrop University Hospital for evaluation of preterm labor will be eligible for this study. Women with indicated preterm births (i.e. pre-eclampsia), multiple pregnancies, known major fetal abnormality (ex. those that are known to be incompatible with life) and premature rupture of membranes will be excluded from this study. After consent is obtained, samples (blood, urine, saliva, vaginal, and cervical secretions) will be obtained and biomarkers will be identified using a Bio-Plex cytokine concentration assay. These women will than be followed until they deliver. Women who deliver after 32 weeks gestation will form our control group and women who deliver before 32 weeks gestation will form our preterm birth group. Concentration of the biomarkers in the various maternal-fetal compartments will be analyzed and compared between the two groups. For all women who delivery ≤ 32 weeks gestation, non-invasive samples will also be collected around delivery and these cytokine levels will be compared to placenta/fetal membranes to access how well non-invasive fluids reflect the intrauterine environment.