Hi @stef1, clotting factors are usually known before any surgeries or medical care. Coagulation is simply a process where the blood doesn't clot in the a well, this can lead to excessive bleeding. Coagulation problems in most cases are been inherited from parents to their offsprings, this is absolutely true because most diseases are passed down from one generation to the next. The body requires vitamin K and we are expected to consume foods containing this vitamin which are Spinach, broccoli and kale. This is really a quality content, bravo amigo.