Changes

===Laboratory Tests===

===Laboratory Tests===

Laboratory tests are unlikely to show abnormalities until 36-72 hours after exposure, due to the delay in onset of haemorrhagic signs. Prothrombin time (PT) is a measure of functionality of the extrinsic pathway, and because factor VII has the shortest half life and thus becomes depleted most rapidly, this parameter  is generally the first to become prolonged.

Laboratory tests are unlikely to show abnormalities until 36-72 hours after exposure, due to the delay in onset of haemorrhagic signs. Prothrombin time (PT) is a measure of functionality of the extrinsic pathway, and because factor VII has the shortest half life and thus becomes depleted most rapidly, this parameter  is generally the first to become prolonged. Partial thromboplastin time (PTT) and activated clotting time (ACT)

The partial thromboplastin

The partial thromboplastin