Potent anticoagulants in a few snake venoms may cause rapidly reversible coagulopathy, without defibrination.

Key early signs include persistent ooze from bite site or venepuncture sites.

Key laboratory tests; prothrombin time/INR, aPTT, fibrinogen levels (should remain normal), fibrin(ogen) degradation products (should be absent).

Key species; mulga snake, Collett's snake.

Value of antivenom treatment: only effective treatment, rapid response.