Thromboelastography and Sonoclot analysis in the healthy parturient

Area of Science:

• Obstetrics and Gynecology
• Hemostasis and Thrombosis
• Clinical Coagulation Testing

Background:

• Viscoelastic coagulation tests like thromboelastography (TEG) and Sonoclot analysis are used to assess hemostasis.
• Establishing normal reference ranges is crucial for interpreting test results in specific patient populations.
• Pregnancy is associated with significant physiological changes that can affect coagulation parameters.

Purpose of the Study:

• To compare whole blood coagulation values obtained from healthy parturients and nonparturient females using TEG and Sonoclot analysis.
• To identify potential differences in coagulation status between pregnant and nonpregnant individuals.

Main Methods:

• A prospective study was conducted at a university hospital.
• 41 healthy nonpregnant females and term parturients (laboring and nonlaboring) were enrolled.
• Blood samples were analyzed using TEG (measuring R, RK, K, alpha degree, MA) and Sonoclot analysis (measuring onset, rate increases, peak, rate decreases).

Main Results:

• Significant differences in all measured TEG parameters were observed between nonpregnant females and parturients (p < 0.05).
• Sonoclot analysis indicated a significantly decreased onset time and increased primary slope (rate of increase) in parturients compared to nonpregnant individuals (p < 0.05).

Conclusions:

• The observed coagulation differences in parturients suggest a hypercoagulable state.
• When utilizing TEG or Sonoclot analysis in obstetric patients, results should be interpreted against reference ranges established for healthy parturients, not healthy nonparturients.