A Multicenter Assessment of a Spontaneous Preterm Birth Risk Predictor

Inclusion Criteria:

- Subject is 18 years of age or older

- Subject has singleton gestation

- Subject is able to provide consent

- Gestational age is confirmed by a documented crown rump length on an ultrasound
performed at the study site within 6 0/7 weeks and 13 6/7 weeks gestation (first
trimester)

- Subject has no signs and/or symptoms of preterm labor and has intact membranes

- Investigator believes subject is willing to comply with study visits and procedures

- Investigator believes the subject's delivery data will be available within 15 business
days from delivery, and neonatal data will be available for data collection purposes
within 15 business days from discharge

Exclusion Criteria:

- The subject has a planned cesarean section or induction of labor prior to 370/7 weeks
of gestation

- The subject has a planned cerclage placement for the current pregnancy

- There is a known or suspected fetal anomaly or chromosomal abnormality

- The subject has had a blood transfusion during the current pregnancy

- The subject has known elevated bilirubin levels (hyperbilirubinemia)

- The subject has taken or plans to take any of the following medications during the
current pregnancy:

- Progesterone or progesterone-derivative medication after 13 6/7 weeks gestation

- Enoxaparin, heparin, heparin sodium, low molecular weight heparin after first day
of last menstrual period

- The subject has participated in, or plans to participate in, an interventional
treatment study during the current pregnancy

- The current pregnancy was previously a multiple gestation that is now a single fetus
due to reduction, vanishing twin, etc.