“…Pregnant women are widely regarded as predisposed to coagulation disorders for a variety of reasons (Kennan 1955, Mammen 1964, Scott 1968, and not least because of profound alterations occurring in the clotting system during normal pregnancy (Todd et al 1965). Of the factors affected, mention should be made here only of the progressive increase in plasma fibrinogen concentration (Gram 1921, 1922, Foster 1924, Ratnoff et al 1954, Gillman et al 1959) demonstrable from the early month of gestation well into the postnatal period, since hyperfibrinogenaemia has been considered as contributing importantly to the prevailing hypercoagulable state (Hardaway 1966).…”