Is there an association between a postpartum venous thromboembolism risk assessment chart and the results of either two different means of determining clot formation, using a sample of blood?

This study is a cross-sectional study of the first 130 women who deliver a live fetus at The Northern Hospital. All women who give birth at The Northern Hospital are assigned a risk category for the subsequent likelihood of developing a deep vein thrombosis within the first 6 weeks post birth. The risk categories are low, intermediate and high. Women who are assigned an intermediate risk receive enoxaparin subcutaneously for the first 5 days after giving birth, whereas those women who are assigned a high risk, will need to receive enoxaparin for the first 6 weeks post birth. Women who are categorised as being of low risk, do not receive enoxaparin. Unfortunately though, approximately 30 % of women who actually develop a deep vein thrombosis are categorised as being of low risk. Therefore, as an initial first step, we would like to determine if a machine, which determines the clotability of blood may also be used to assign a risk category for the subsequent development of deep vein thrombosis in women who have recently given birth. A positive result may allow us to to identify the 30% of women who are incorrectly categorised as being of low risk.