lupus anticoagulants represent a subclass of anti-phospholipid antibodies which are characterized by their ability to prolong the clotting time in in vitro coagulation assays measuring partial thromboplastin time ( ptt ) ( thiagarajan , p. , shapiro , s. s. , and demarco , l. ( 1980 ) j. clin . invest . 66 , 397-405 ) .
C0085240
lupus anticoagulants
C0162595
anti-phospholipid