Reference Range Study for the Quantra System With the QStat Cartridge in Obstetric Patients

Inclusion Criteria: * Subject is female, age 18 to 45 years old. * Subject is pregnant with a single fetus and duration of pregnancy is \>28weeks * Subject is willing to participate and has provided informed consent. Exclusion Criteria: * Subject has a history of a coagulation disorder (including excessive bleeding, thrombosis, VWD, or any factor deficiencies). * Subject has taken medications known to alter coagulation during pregnancy including heparin, warfarin/Coumadin®, antiplatelet drugs including Plavix® or aspirin at a dose greater than 81 mg/day, Xarelto® or Eliquis®, or other anticoagulants. * Subject has experienced one or more complications during pregnancy such as gestational diabetes, high blood pressure, pre-eclampsia or eclampsia, hypovolemia or pre-term labor. * Subject had a blood transfusion during pregnancy. * Subject has a history of smoking/vaping during pregnancy