Directly after birth, laboratory tests showed no coagulation disorders [activated partial thromboplastin time (APTT) 38.5 seconds, prothrombin time (PT) 14.6 seconds, fibrinogen 2.4 g/L], and there was no polycythemia (venous hematocrit 0.56 L/L). This evidence concerns the gene F2 and blood coagulation disease.