There is a coagulation studies panel which any blood lab where your doctor gets his tests done should be able to do.. My coagulation panel shows my prothrombin time out of normal range (coagulates faster). My A.P.T.T. on that coagulation studies panel thou was normal but on a A.P.T.T. that was done as part of a normal hospitals haematology report.. on that one my A.P.T.T. was abnormal. normal range 26-39 .. mine was at 24. Of cause me having the crappy doctors Ive had.. this abnormalties were ignored and one was even put down to possible lab error, they didnt even ask if my previous coagulation test in that area had been abnormal too (those two times thou are the only times Ive had coagulation tested). Interestingly before ME, I was a bleeder and had unusual haemorrages (needed a blood tranfusion one time) and I also had some surgery done due my bleeding issues (my tonsils were taken out cause my nose kept badly leeding.. yeah it dont make sense to me either but the severe nose bleeds I used to get did stop when they took them out) now Im the opposite.