Inclusion Criteria:  Subject >18 years of age. Initial assessment of thrombosis. Consent provided. Patient declared healthy and suitable for participation by PI. Suitable venous access.  Exclusion Criteria:  Unable to provide informed consent. Pregnancy. Undergoing end of life care. The subject is currently receiving or has received within the past thirty days of the study visit an experimental biologic or drug including either treatment or therapy Haemodynamically unstable. Current anticoagulation therapy. Flu symptoms acknowledged by the PI. Positive Covid-19 test result.