MRCP2-2274

A 35-year-old woman has been diagnosed with placenta praevia and is experiencing bleeding from the cannulation site during caesarean delivery. Her laboratory results indicate a platelet count of 40 ×109/L, a fibrinogen level of 0.4, prolonged PT at 14 seconds, and an elevated quantitative D-dimer. What is the most useful parameter to determine if this patient needs active treatment?