Abstract: The invention relates to the use of phosphorylated Acetyl-CoA carboxylase (ACC) in platelets from a subject as a biomarker for blood coagulation, preferably blood coagulation in the subject, preferably encompassing activation of the coagulation cascade as well as platelet activation, preferably thrombin-induced platelet activation. The invention encompasses uses and methods for the diagnosis or the monitoring of blood coagulation in the subject. The invention further relates to uses and methods for screening for anti-coagulants or pro-coagulants.