This study compares the results of the existing coagulation monitoring technology to the Ultrasound-based viscoelastic hemostasis analysis, a new method, using small amount of extra blood obtained during routine blood draws in surgery patients.

Ultrasound-based viscoelastic hemostasis analysis is a novel POC diagnostic method, which is suitable for use in surgical care settings.

The novel viscoelastic hemostasis analysis uses ultrasound guided waves to characterize the dynamic changes in viscoelastic properties of a blood sample during coagulation and clot lysis, which will be the surgical assay for monitoring hemostasis during major surgical procedures in adult patients.

This single-center, prospective, observational pilot study will evaluate the analytical performance as well as compared to standard coagulation tests and comparable measures using conventional viscoelastic testing methods.

Inclusion Criteria:

• Subject is scheduled for surgery with general surgery
• Subject is 18 years or order
• Subject requires routine TEG measurement

Exclusion Criteria:

• Subject is unwilling to participate
• Subject is unable to sign a consent form
• Subject is unsuitable for blood drawing
• Subject is unsuitable for this study in the opinion of the anesthesiologist

Participants for this study will be recruited at the Second Affiliated Hospital Zhejiang University School of Medicine. The study participants will be adult general anesthesia patients such that viscoelastic testing is performed to assess coagulopathy.