QStat Cartridge in Obstetric Patients

The Quantra System is a fully integrated and automated in vitro diagnostic device which uses SEER Sonorheometry, an ultrasound-based technology, to characterize the viscoelastic properties of a whole blood sample during coagulation. The QStat Cartridge was developed to monitor hemostasis in patients that may experience a range of coagulopathies of various etiologies including fibrinolytic defects. These patients include the tobstetric hemorrhage population. The cartridge consists of four independent channels each containing different sets of reagents, which provide four measurements performed in parallel yielding five parameters that depict the functional status of a patient's coagulation system.

This multicenter, prospective, observational pilot study will evaluate the performance of the Quantra System with the QStat Cartridge as compared to standard of care coagulation testing in pregnant women at risk of bleeding at delivery.

• Quantra Hemostasis Analyzer with the QStat Cartridge (Diagnostic test), also known as Quantra System, QStat Cartridge: Diagnostic device to monitor coagulation properties of a whole blood sample at the point-of-care.

Primary outcomes

• Comparison of Quantra Clot Time to laboratory aPTT test results [At the time hemorrhage is suspected, anticipated within 24 hours after birth]: Coagulation function assessed by Quantra Clot Time (CT, sec) and activated partial thromboplastin (aPTT, sec) test
• Comparison of Quantra Fibrinogen Contribution to Clot Stiffness to laboratory coagulation fibrinogen test results [At the time hemorrhage is suspected, anticipated within 24 hours after birth]: Coagulation function assessed by Quantra Fibrinogen Contribution to Clot Stiffness (FCS, hPa) and Clauss fibrinogen (mg/dL) test
• Comparison of Quantra Clot Time to ROTEM delta INTEM CT test results [At the time hemorrhage is suspected, anticipated within 24 hours after birth]: Coagulation function assessed by Quantra Clot Time (CT, sec) and ROTEM INTEM CT (sec) test
• Comparison of Quantra Fibrinogen Contribution to Clot Stiffness to ROTEM delta FIBTEM test results [At the time hemorrhage is suspected, anticipated within 24 hours after birth]: Coagulation function assessed by Quantra Fibrinogen Contribution to Clot Stiffness (FCS, hPa) and ROTEM FIBTEM (mm) test

Sex: Female, ages: 18 Years to 50 Years

Inclusion Criteria:

* Subject is greater than18 years.
* Subject is pregnant or at least 24 h postpartum
* Conventional coagulation tests and/or viscoelastic testing are ordered for concern of possible coagulopathy based on one or more clinical scenarios including hemorrhage, suspected or confirmed placental abruption, amniotic fluid embolism, or placenta accreta spectrum
* Subject or subject's LAR is willing to provide informed consent, either prospectively or by deferred consent.

Exclusion Criteria:

* Subject is younger than 18 years old.
* Subject or subject's LAR is unwilling or unable to provide informed consent, either prospectively or by deferred consent.
* Subject is incarcerated at the time of the study.
* Subject is currently enrolled in a distinct study that might confound the results of the proposed study
* Subject is affected by a condition that, in the opinion of the clinical team, may pose additional risks