Pre-op CSDHs evacuation Post-op CSDHs evacuation Post-op Acute subdural hematoma evacuation Normal values Unit of Measures Platelet 253 253 253 150 - 400 Giga/L aPTT 34.4 32.3 -   sec PT 12.7 13.1 -   sec INR 0.9 0.94 - 0.80-1.20   Prothrombin Activity Percentage 121 112 - >70 % Mean platelet volume 9.3 8.6 8.6   µm3

Table 1: Coagulation values.