Blood markers may forecast preterm delivery within a week

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria for patients: * Threat of preterm labour (PTL) occurring between 24 and 34 WOA, defined according to validated criteria i.e. by (1) the presence of regular uterine contractions, lasting at least 30 seconds at a frequency ≥ 4 contractions every 30 minutes and confirmed by an external tocogram, (2) a cervical dilation of 3 cm or greater, to focus on true preterm labour, for the nulliparous women and 1-3 cm among primiparous women or multiparous and (3) a cervical obliteration \>50%, or a cervix less than 25mm according to the echography, when this information is available. The first two criteria being mandatory, the third one optional as it is more subjective, or less likely to be available for every patient. * Person who has given written consent * Singleton pregnancy Inclusion Criteria for volunteers: * Person who has given written consent * Group 1: Women of reproductive age who have never had a pregnancy, even if not completed to term. * Group 2: Single full-term, uncomplicated pregnancy (= out of hospital) older than 6 months. Exclusion Criteria for patients: * Pre-existing diabetes or gestational diabetes, morbid obesity (BMI \> 35 kg/m2) as these situations modify the expression of MCP-1. * Woman presenting a spontaneous rupture of membranes (SRM) with confirmed or probable chorioamniotitis * Inflammatory or auto-immune disease * Suspected or confirmed infectious disease, including HIV, HCV, HBV * Anti-inflammatory drug treatment or immuno-modulator. * Multiple pregnancies * PTL \<24 WOA or \>34 WOA * Patient less than 18 years of age. * Patient not affiliated to social security insurance Exclusion Criteria for volunteers: * Pre-existing diabètes * Morbid obesity (BMI \> 35 kg/m2) * Inflammatory or auto-immune disease * Suspected or confirmed infectious disease, including HIV, HCV, HBV * Anti-inflammatory drug treatment or immuno-modulator. * Minor person * Person not affiliated to social security insurance * History of twin pregnancy