Circulating Inhibitor against Factor X: A Rare Cause of Hemorrhagic Diathesis

Table 3

Plasma mixing study.

	Normal pool	1/2 dilution	1/4 dilution	1/8 dilution	Patient	Reference intervals
PT (%)	100%	65%	88%	94%	18%	70–110
aPTT (s)^†	33.3	45.9	36.0	33.8	81.0	28–42
aPTT (s)^‡	30.0	33.5	31.0	30.2	53.4	28–37

As in Table 1, reagent used for PT determination was STA Neoplastine CI Plus 5. ^†Mixing study was performed using two different reagents for determining aPTT. First line was using reagent STA-PTT Automate (Stago), activator being micronized silica. The aPTT value of 81.0 s in this first line, obtained from a repeated sample, exhibits a slight variance from the corresponding value in Table 1. ^‡Second line displays aPTT determination using reagent STA-CK Prest 5 (Stago), activator being kaolin.